backend/src/itemFilters.ts

@@ -8,7 +8,14 @@ export type { ItemStatus };
 export class FilterError extends Error {}
 
 export interface ItemFilters {
-  categoryId: number | null;
+  // Several categories, combined as OR — a customer picking Furniture and
+  // Decor wants both, not the empty intersection. Deliberately the opposite of
+  // how tagIds combine below, which is AND; the two controls say so in the UI
+  // rather than leaving it to be discovered.
+  //
+  // Each selected id still expands to its descendants, so choosing two parents
+  // means "anything filed under either of them".
+  categoryIds: number[];
   tagIds: number[];
   minPriceCents: number | null;
   maxPriceCents: number | null;
@@ -110,12 +117,33 @@ function parsePrice(value: unknown, name: string): number | null {
   return parseNonNegativeInteger(raw, name);
 }
 
-function parseCategoryId(value: unknown): number | null {
+/**
+ * Comma-separated, the same shape `tags` and `status` already use.
+ *
+ * The parameter keeps its singular name so that every `?category=1` link,
+ * bookmark and shared URL written before this went multi-valued still parses —
+ * as a list of one, needing no alias and leaving no way to give the filter
+ * twice with different meanings.
+ */
+function parseCategoryIds(value: unknown): number[] {
   const raw = singleValue(value, 'category');
-  if (raw === null || raw === '') {
-    return null;
+  const categoryIds: number[] = [];
+  if (!raw) {
+    return categoryIds;
   }
-  return parseId(raw, 'category');
+  for (const part of raw.split(',')) {
+    const trimmed = part.trim();
+    if (trimmed === '') {
+      continue;
+    }
+    const id = parseId(trimmed, 'category');
+    // Duplicates are harmless to the OR below, but they would show twice in
+    // any caller that renders the parsed filter back.
+    if (!categoryIds.includes(id)) {
+      categoryIds.push(id);
+    }
+  }
+  return categoryIds;
 }
 
 function parseTagIds(value: unknown): number[] {
@@ -193,7 +221,7 @@ function parseFavoritesOnly(value: unknown): boolean {
 // deliberate and observable: a query wrong in two ways reports the first
 // field, so moving these lines around changes which error a caller sees.
 export function parseItemFilters(query: Record<string, unknown>): ItemFilters {
-  const categoryId = parseCategoryId(query.category);
+  const categoryIds = parseCategoryIds(query.category);
   const tagIds = parseTagIds(query.tags);
 
   const minPriceCents = parsePrice(query.min_price, 'min_price');
@@ -205,7 +233,7 @@ export function parseItemFilters(query: Record<string, unknown>): ItemFilters {
   const status = parseStatus(query.status);
   const favoritesOnly = parseFavoritesOnly(query.favorites);
 
-  return { categoryId, tagIds, minPriceCents, maxPriceCents, status, favoritesOnly };
+  return { categoryIds, tagIds, minPriceCents, maxPriceCents, status, favoritesOnly };
 }
 
 // Returns WHERE fragments plus their parameters, with placeholders numbered
@@ -226,15 +254,20 @@ export function buildItemFilterSql(
   const params: unknown[] = [];
   let next = startIndex;
 
-  if (filters.categoryId !== null) {
-    params.push(filters.categoryId);
+  if (filters.categoryIds.length) {
+    params.push(filters.categoryIds);
     // Selecting a category means "and everything filed beneath it", so walk the
-    // tree down from the chosen node. A recursive CTE keeps the tree
+    // tree down from each chosen node. A recursive CTE keeps the tree
     // un-denormalized: reparenting stays a single UPDATE with no stored paths
     // to rewrite.
+    //
+    // Seeded with `= ANY(...)` rather than one id, so every selected root is
+    // walked in the same recursion. That also gives the OR for free: the union
+    // of the subtrees is exactly "filed under any of these", and an item filed
+    // under two selected branches appears once because IN is a set test.
     clauses.push(`i.category_id IN (
       WITH RECURSIVE subtree AS (
-        SELECT id FROM categories WHERE id = $${next}
+        SELECT id FROM categories WHERE id = ANY($${next}::int[])
         UNION ALL
         SELECT c.id FROM categories c JOIN subtree s ON c.parent_id = s.id
       )

backend/tests/integration/categoriesTags.integration.test.ts

@@ -371,6 +371,34 @@ describe('GET /api/items filtering', () => {
     expect(res.body.map((i: { name: string }) => i.name).sort()).toEqual(['Deep', 'Mid', 'Top']);
   });
 
+  it('combines several categories as any-of rather than all-of', async () => {
+    const furniture = await createCategory('Furniture');
+    const tables = await createCategory('Tables', furniture);
+    const decor = await createCategory('Decor');
+    const art = await createCategory('Art');
+
+    await createItem('Nested', 1000, tables);
+    await createItem('Elsewhere', 1000, decor);
+    await createItem('Unrelated', 1000, art);
+
+    // Two branches sharing no items, so an AND would answer with nothing at
+    // all — which is the failure this exists to catch.
+    const res = await request(app).get(`/api/items?category=${furniture},${decor}`);
+    expect(res.body.map((i: { name: string }) => i.name).sort()).toEqual(['Elsewhere', 'Nested']);
+  });
+
+  it('lists an item once when its category sits under two selected branches', async () => {
+    const furniture = await createCategory('Furniture');
+    const tables = await createCategory('Tables', furniture);
+    await createItem('Nested', 1000, tables);
+
+    // The subtrees overlap: Tables is walked from both seeds, so the recursion
+    // yields its id twice. Selecting on IN makes that a set test rather than a
+    // join, so the item still appears once.
+    const res = await request(app).get(`/api/items?category=${furniture},${tables}`);
+    expect(res.body.map((i: { name: string }) => i.name)).toEqual(['Nested']);
+  });
+
   it('excludes uncategorized items from a category filter', async () => {
     const furniture = await createCategory('Furniture');
     await createItem('Filed', 1000, furniture);
@@ -444,6 +472,16 @@ describe('GET /api/items filtering', () => {
     expect(res.status).toBe(400);
   });
 
+  it('rejects a category list with one unreadable entry rather than honouring the rest', async () => {
+    const furniture = await createCategory('Furniture');
+    await createItem('A', 1000, furniture);
+
+    // Filtering on the readable half would answer a narrower question than the
+    // one asked, and look indistinguishable from a filter that worked.
+    const res = await request(app).get(`/api/items?category=${furniture},furniture`);
+    expect(res.status).toBe(400);
+  });
+
   it('rejects an inverted price range', async () => {
     const res = await request(app).get('/api/items?min_price=5000&max_price=1000');
     expect(res.status).toBe(400);

backend/tests/unit/itemFilters.test.ts

@@ -3,7 +3,7 @@ import { parseItemFilters, FilterError, buildItemFilterSql } from '../../src/ite
 describe('parseItemFilters', () => {
   it('returns empty filters for an empty query', () => {
     expect(parseItemFilters({})).toEqual({
-      categoryId: null,
+      categoryIds: [],
       tagIds: [],
       minPriceCents: null,
       maxPriceCents: null,
@@ -12,8 +12,30 @@ describe('parseItemFilters', () => {
     });
   });
 
-  it('parses a category id', () => {
-    expect(parseItemFilters({ category: '7' }).categoryId).toBe(7);
+  // The parameter stayed singular when it went multi-valued (#139), so every
+  // link written before that still parses — as a list of one.
+  it('parses a single category id, as older links still send it', () => {
+    expect(parseItemFilters({ category: '7' }).categoryIds).toEqual([7]);
+  });
+
+  it('parses a comma-separated category list', () => {
+    expect(parseItemFilters({ category: '4,9,2' }).categoryIds).toEqual([4, 9, 2]);
+  });
+
+  it('collapses duplicate category ids', () => {
+    expect(parseItemFilters({ category: '3,3,8' }).categoryIds).toEqual([3, 8]);
+  });
+
+  it('treats an empty category list as no category filter', () => {
+    expect(parseItemFilters({ category: '' }).categoryIds).toEqual([]);
+  });
+
+  // Decision 9: a malformed filter shows itself rather than quietly returning
+  // the whole catalogue, and going multi-valued must not weaken that.
+  it('refuses a category list containing anything unreadable', () => {
+    expect(() => parseItemFilters({ category: '4,nope' })).toThrow(FilterError);
+    expect(() => parseItemFilters({ category: '0' })).toThrow(FilterError);
+    expect(() => parseItemFilters({ category: '-1,2' })).toThrow(FilterError);
   });
 
   it('parses a comma-separated tag list', () => {
@@ -158,7 +180,19 @@ describe('buildItemFilterSql', () => {
   it('matches a category and all of its descendants', () => {
     const built = buildItemFilterSql(parseItemFilters({ category: '4' }), 1, null);
     expect(built.clauses.join(' ')).toContain('RECURSIVE');
-    expect(built.params).toEqual([4]);
+    // One array parameter rather than one id: the CTE is seeded with ANY so
+    // several selected roots are walked in the same recursion.
+    expect(built.params).toEqual([[4]]);
+  });
+
+  it('seeds the descendant walk with every selected category', () => {
+    const built = buildItemFilterSql(parseItemFilters({ category: '4,9' }), 1, null);
+    const sql = built.clauses.join(' ');
+    expect(sql).toContain('RECURSIVE');
+    // ANY over the seeds is what makes several categories combine as OR: the
+    // result is the union of their subtrees.
+    expect(sql).toContain('= ANY($1::int[])');
+    expect(built.params).toEqual([[4, 9]]);
   });
 
   it('requires every listed tag rather than any of them', () => {
@@ -215,7 +249,7 @@ describe('buildItemFilterSql', () => {
       1,
       null
     );
-    expect(built.params).toEqual([4, 100, 900]);
+    expect(built.params).toEqual([[4], 100, 900]);
     const sql = built.clauses.join(' ');
     expect(sql).toContain('$1');
     expect(sql).toContain('$2');

frontend/src/App.tsx

@@ -230,7 +230,8 @@ export default function App() {
             Filters{activeCount ? ` (${activeCount})` : ''}
           </Button>
           <ActiveFilterChips
-            options={options}
+            categories={options?.categories ?? []}
+            tags={options?.tags ?? []}
             filters={filters}
             onChange={applyFilters}
             onClear={clearFilters}
@@ -280,11 +281,14 @@ export default function App() {
       <FilterDrawer
         open={drawerOpen}
         onClose={() => setDrawerOpen(false)}
-        options={options}
+        categories={options?.categories ?? []}
+        tags={options?.tags ?? []}
+        priceRange={options?.priceRange ?? null}
         filters={filters}
         onChange={applyFilters}
         onClear={clearFilters}
         resultCount={items.length}
+        showFavorites
       />
 
       {/* The same prompt the heart button and Add to Cart use. Signing in

frontend/src/admin/Admin.tsx

@@ -275,6 +275,7 @@ function Inventory() {
         filters={filters}
         onChange={applyFilters}
         onClear={clearFilters}
+        resultCount={items.length}
       />
 
       <Table rowKey="id" dataSource={items} columns={columns} scroll={{ x: true }} />

frontend/src/admin/InventoryFilters.tsx

@@ -1,40 +1,10 @@
-import { useMemo } from 'react';
-import TreeSelect from 'antd/es/tree-select';
-import Select from 'antd/es/select';
-import InputNumber from 'antd/es/input-number';
+import { useState } from 'react';
 import Button from 'antd/es/button';
+import { FilterOutlined } from '@ant-design/icons';
 import type { Category, Tag } from '../api';
-import {
-  ItemFilters,
-  ItemStatus,
-  buildCategoryTree,
-  CategoryNode,
-  hasActiveFilters
-} from '../filters';
-
-// Named individually rather than grouped, because grouping is what the preset
-// this replaces did. Pending is listed first: "what is waiting to be published"
-// is the question that prompted #132.
-const STATUS_OPTIONS: { value: ItemStatus; label: string }[] = [
-  { value: 'pending', label: 'Pending' },
-  { value: 'available', label: 'Available' },
-  { value: 'reserved', label: 'Reserved' },
-  { value: 'sold', label: 'Sold' }
-];
-
-interface CategoryTreeOption {
-  value: number;
-  title: string;
-  children?: CategoryTreeOption[];
-}
-
-function toTreeData(nodes: CategoryNode[]): CategoryTreeOption[] {
-  return nodes.map((node) => ({
-    value: node.id,
-    title: node.name,
-    children: node.children.length ? toTreeData(node.children) : undefined
-  }));
-}
+import { ItemFilters, activeFilterCount } from '../filters';
+import FilterDrawer from '../components/FilterDrawer';
+import ActiveFilterChips from '../components/ActiveFilterChips';
 
 type Props = Readonly<{
   categories: Category[];
@@ -42,95 +12,67 @@ type Props = Readonly<{
   filters: ItemFilters;
   onChange: (filters: ItemFilters) => void;
   onClear: () => void;
+  resultCount: number;
 }>;
 
-const centsToDollars = (cents: number | null): number | null => (cents === null ? null : cents / 100);
-const dollarsToCents = (dollars: number | null): number | null =>
-  dollars === null || Number.isNaN(dollars) ? null : Math.round(dollars * 100);
+// The same flyout the storefront uses, rather than the row of controls this
+// used to be (#169).
+//
+// That row was deliberate — it carried a comment arguing that hiding the
+// controls above a data table costs more than the space it saves, and that a
+// drawer overlays the very rows being filtered. Both are true, and both are
+// traded for the two screens asking the same questions through the same UI.
+// The chips are what makes the trade bearable: the active filter stays readable
+// beside the button without opening anything, which is what the always-visible
+// row was really protecting.
+export default function InventoryFilters({
+  categories,
+  tags,
+  filters,
+  onChange,
+  onClear,
+  resultCount
+}: Props) {
+  const [drawerOpen, setDrawerOpen] = useState(false);
 
-// An always-visible row rather than the storefront's drawer: this sits above a
-// data table, where hiding the controls behind a click costs more than the
-// space it saves, and a drawer would overlay the very rows being filtered.
-export default function InventoryFilters({ categories, tags, filters, onChange, onClear }: Props) {
-  const treeData = useMemo(() => toTreeData(buildCategoryTree(categories)), [categories]);
+  // Status lives in the drawer here, unlike on the storefront, so it belongs in
+  // the button's tally — activeFilterCount leaves it out precisely because the
+  // storefront filters status outside the drawer.
+  const activeCount = activeFilterCount(filters) + (filters.status === null ? 0 : 1);
 
   return (
     <div className="inventory-filters">
-      <TreeSelect
-        allowClear
-        showSearch
-        treeNodeFilterProp="title"
-        listHeight={256}
-        placeholder="Any category"
-        aria-label="Filter by category"
-        style={{ minWidth: 200 }}
-        treeData={treeData}
-        value={filters.categoryId ?? undefined}
-        onChange={(value) => onChange({ ...filters, categoryId: value ?? null })}
+      <Button
+        icon={<FilterOutlined />}
+        onClick={() => setDrawerOpen(true)}
+        type={activeCount ? 'primary' : 'default'}
+      >
+        Filters{activeCount ? ` (${activeCount})` : ''}
+      </Button>
+
+      <ActiveFilterChips
+        categories={categories}
+        tags={tags}
+        filters={filters}
+        onChange={onChange}
+        onClear={onClear}
+        showStatus
       />
 
-      <Select
-        allowClear
-        mode="multiple"
-        placeholder="Any tags"
-        aria-label="Filter by tags"
-        style={{ minWidth: 200 }}
-        value={filters.tagIds}
-        onChange={(value: number[]) => onChange({ ...filters, tagIds: value })}
-        options={tags.map((tag) => ({ value: tag.id, label: tag.name }))}
+      <FilterDrawer
+        open={drawerOpen}
+        onClose={() => setDrawerOpen(false)}
+        categories={categories}
+        tags={tags}
+        // No slider: the admin has no catalogue-wide price range to bound one
+        // with, and inventing bounds would misreport where the prices are.
+        priceRange={null}
+        filters={filters}
+        onChange={onChange}
+        onClear={onClear}
+        resultCount={resultCount}
+        showStatus
       />
-
-      <InputNumber
-        aria-label="Minimum price"
-        prefix="$"
-        min={0}
-        placeholder="Min"
-        style={{ width: 110 }}
-        value={centsToDollars(filters.minPriceCents)}
-        onChange={(value) => onChange({ ...filters, minPriceCents: dollarsToCents(value) })}
-      />
-      <span style={{ opacity: 0.6 }}>to</span>
-      <InputNumber
-        aria-label="Maximum price"
-        prefix="$"
-        min={0}
-        placeholder="Max"
-        style={{ width: 110 }}
-        value={centsToDollars(filters.maxPriceCents)}
-        onChange={(value) => onChange({ ...filters, maxPriceCents: dollarsToCents(value) })}
-      />
-
-      {/* The status dimension itself rather than presets over it, which #105's
-          Sold / Not sold / All control was. Presets could not express Published
-          or Unpublished, could not isolate Reserved, and would have grown a new
-          button for every new question. Selecting statuses answers all of them:
-          Unpublished is Pending, Published is the other three, and Not sold is
-          everything except Sold.
-
-          A second control for publication would have read more naturally and
-          reintroduced what #105 avoided — Sold and Unpublished is an impossible
-          pair, since a sold item is necessarily published. One dimension cannot
-          contradict itself. See #132.
-
-          The storefront keeps the three-way preset: pending is excluded from
-          every public read, so Published and Unpublished are not distinctions a
-          customer can draw. */}
-      <Select
-        allowClear
-        mode="multiple"
-        placeholder="Any status"
-        aria-label="Filter by status"
-        style={{ minWidth: 220 }}
-        value={filters.status ?? []}
-        onChange={(value: ItemStatus[]) =>
-          // Empty means no filter, not "no statuses". A multi-select cleared
-          // back to nothing should show everything rather than an empty table.
-          onChange({ ...filters, status: value.length ? value : null })
-        }
-        options={STATUS_OPTIONS}
-      />
-
-      {hasActiveFilters(filters) && <Button onClick={onClear}>Clear filters</Button>}
     </div>
   );
 }

frontend/src/components/ActiveFilterChips.tsx

@@ -1,21 +1,30 @@
 import Tag from 'antd/es/tag';
 import Button from 'antd/es/button';
-import type { FilterOptions } from '../api';
-import { ItemFilters, categoryPath, formatPriceRange, hasActiveFilters } from '../filters';
+import type { Category, Tag as ItemTag } from '../api';
+import { ItemFilters, categoryPath, formatPriceRange, hasActiveFilters, statusLabel } from '../filters';
 
 type Props = Readonly<{
-  options: FilterOptions | null;
+  categories: Category[];
+  tags: ItemTag[];
   filters: ItemFilters;
   onChange: (filters: ItemFilters) => void;
   onClear: () => void;
+  // Where status is one of the drawer's controls rather than a preset beside
+  // it (#169), it needs a chip too — otherwise the one filter most likely to
+  // empty a table is the one filter invisible without opening the drawer.
+  showStatus?: boolean;
 }>;
 
-export default function ActiveFilterChips({ options, filters, onChange, onClear }: Props) {
+export default function ActiveFilterChips({
+  categories,
+  tags,
+  filters,
+  onChange,
+  onClear,
+  showStatus = false
+}: Props) {
   if (!hasActiveFilters(filters)) return null;
 
-  const categories = options?.categories ?? [];
-  const tags = options?.tags ?? [];
-
   const chips: { key: string; label: string; onRemove: () => void }[] = [];
 
   // Listed first so it matches the drawer's ordering, and because it is the
@@ -28,17 +37,20 @@ export default function ActiveFilterChips({ options, filters, onChange, onClear
     });
   }
 
-  if (filters.categoryId !== null) {
-    const path = categoryPath(categories, filters.categoryId);
+  // One chip per selected category, each removable on its own — removing the
+  // whole set at once is what Clear all is for.
+  for (const categoryId of filters.categoryIds) {
+    const path = categoryPath(categories, categoryId);
     // Falls back to the raw id while /api/filters is still loading, so the chip
     // never renders as an empty box.
-    const label = path || `Category ${filters.categoryId}`;
+    const label = path || `Category ${categoryId}`;
     chips.push({
-      key: `category-${filters.categoryId}`,
-      // The removable name is the leaf, matching what the user clicked in the
-      // tree, while the chip itself shows the full path for context.
+      key: `category-${categoryId}`,
+      // The chip shows the full path for context, since two categories can
+      // share a leaf name under different parents.
       label,
-      onRemove: () => onChange({ ...filters, categoryId: null })
+      onRemove: () =>
+        onChange({ ...filters, categoryIds: filters.categoryIds.filter((id) => id !== categoryId) })
     });
   }
 
@@ -51,6 +63,21 @@ export default function ActiveFilterChips({ options, filters, onChange, onClear
     });
   }
 
+  if (showStatus && filters.status !== null) {
+    for (const status of filters.status) {
+      chips.push({
+        key: `status-${status}`,
+        label: statusLabel(status),
+        onRemove: () => {
+          const rest = (filters.status ?? []).filter((value) => value !== status);
+          // Back to null rather than an empty list: emptying the control means
+          // "no status filter", not "no statuses", which would empty the table.
+          onChange({ ...filters, status: rest.length ? rest : null });
+        }
+      });
+    }
+  }
+
   if (filters.minPriceCents !== null || filters.maxPriceCents !== null) {
     chips.push({
       key: 'price',

frontend/src/components/FilterDrawer.tsx

@@ -1,34 +1,67 @@
 import Drawer from 'antd/es/drawer';
 import Button from 'antd/es/button';
-import Tree from 'antd/es/tree';
+import TreeSelect from 'antd/es/tree-select';
+import Select from 'antd/es/select';
 import Tag from 'antd/es/tag';
 import Slider from 'antd/es/slider';
 import InputNumber from 'antd/es/input-number';
 import Empty from 'antd/es/empty';
 import Switch from 'antd/es/switch';
 import Grid from 'antd/es/grid';
-import type { DataNode } from 'antd/es/tree';
-import type { FilterOptions } from '../api';
-import { ItemFilters, buildCategoryTree, CategoryNode } from '../filters';
+import type { Category, Tag as ItemTag } from '../api';
+import { ItemFilters, ItemStatus, STATUS_OPTIONS, buildCategoryTree, CategoryNode } from '../filters';
 
+// One drawer for the storefront and the admin, with the sections that differ
+// driven by props rather than by a second component that would drift (#169).
+// What is shared is not just the markup but the phrasing of the rules — that
+// categories are OR and tags are AND has to read the same on both screens or it
+// stops being one rule.
 type Props = Readonly<{
   open: boolean;
   onClose: () => void;
-  options: FilterOptions | null;
+  categories: Category[];
+  tags: ItemTag[];
+  // Bounds for the price slider, or null on a screen with no catalogue-wide
+  // range to draw one from, where the two number inputs stand alone. A slider
+  // needs real bounds: invented ones would misreport where the prices are.
+  priceRange: { min_cents: number; max_cents: number } | null;
   filters: ItemFilters;
   onChange: (filters: ItemFilters) => void;
   onClear: () => void;
   resultCount: number;
+  // Storefront only — signing in is what makes favorites mean anything.
+  showFavorites?: boolean;
+  // Admin only. The storefront keeps its three-way preset outside the drawer:
+  // pending is excluded from every public read, so Published and Unpublished
+  // are not distinctions a customer can draw.
+  showStatus?: boolean;
 }>;
 
-function toTreeData(nodes: CategoryNode[]): DataNode[] {
+// `value` rather than `key`: this fed an antd `Tree`, which identifies nodes by
+// key, and now feeds a `TreeSelect`, which selects and searches by value. The
+// shape matches the admin's CategoryTreeSelect so the two stay comparable.
+interface CategoryTreeOption {
+  value: number;
+  title: string;
+  children?: CategoryTreeOption[];
+}
+
+function toTreeData(nodes: CategoryNode[]): CategoryTreeOption[] {
   return nodes.map((node) => ({
-    key: node.id,
+    value: node.id,
     title: node.name,
     children: node.children.length ? toTreeData(node.children) : undefined
   }));
 }
 
+const sectionHeading: React.CSSProperties = {
+  margin: '0 0 8px',
+  fontSize: 12,
+  letterSpacing: '.06em',
+  textTransform: 'uppercase',
+  opacity: 0.65
+};
+
 const centsToDollars = (cents: number | null): number | null => (cents === null ? null : cents / 100);
 const dollarsToCents = (dollars: number | null): number | null =>
   dollars === null || Number.isNaN(dollars) ? null : Math.round(dollars * 100);
@@ -36,30 +69,26 @@ const dollarsToCents = (dollars: number | null): number | null =>
 export default function FilterDrawer({
   open,
   onClose,
-  options,
+  categories,
+  tags,
+  priceRange,
   filters,
   onChange,
   onClear,
-  resultCount
+  resultCount,
+  showFavorites = false,
+  showStatus = false
 }: Props) {
   const screens = Grid.useBreakpoint();
-  const categories = options?.categories ?? [];
-  const tags = options?.tags ?? [];
-  const bounds = options?.priceRange ?? { min_cents: 0, max_cents: 0 };
+  const bounds = priceRange ?? { min_cents: 0, max_cents: 0 };
 
-  function toggleTag(tagId: number) {
-    const next = filters.tagIds.includes(tagId)
-      ? filters.tagIds.filter((id) => id !== tagId)
-      : [...filters.tagIds, tagId];
-    onChange({ ...filters, tagIds: next });
+  function selectCategories(ids: number[]) {
+    onChange({ ...filters, categoryIds: ids });
   }
 
-  // Selecting the already-selected node clears the filter, so the tree doubles
-  // as its own "all items" control.
-  function selectCategory(keys: React.Key[]) {
-    const picked = keys.length ? Number(keys[0]) : null;
-    onChange({ ...filters, categoryId: picked === filters.categoryId ? null : picked });
-  }
+  // The selected pills are rendered by the Select, which is handed ids rather
+  // than tags, so the colour has to be looked up rather than carried along.
+  const tagColors = new Map(tags.map((tag) => [tag.id, tag.color]));
 
   const sliderMax = Math.max(bounds.max_cents, bounds.min_cents + 100);
 
@@ -86,8 +115,9 @@ export default function FilterDrawer({
           here for their favorites should not have to scroll past the catalogue
           controls to find it. Shown to signed-out visitors too: switching it on
           prompts them to sign in, which is how they learn favorites exist. */}
+      {showFavorites && (
       <section style={{ marginBottom: 28 }}>
-        <h4 style={{ margin: '0 0 8px', fontSize: 12, letterSpacing: '.06em', textTransform: 'uppercase', opacity: 0.65 }}>
+        <h4 style={sectionHeading}>
           Favorites
         </h4>
         {/* Deliberately not wrapped in a <label>: antd renders the switch as a
@@ -103,18 +133,31 @@ export default function FilterDrawer({
           <span>Only my favorites</span>
         </div>
       </section>
+      )}
 
       <section style={{ marginBottom: 28 }}>
-        <h4 style={{ margin: '0 0 8px', fontSize: 12, letterSpacing: '.06em', textTransform: 'uppercase', opacity: 0.65 }}>
-          Category
+        <h4 style={sectionHeading}>
+          Categories — any of these
         </h4>
         {categories.length ? (
-          <Tree
+          // A TreeSelect rather than a Tree: it keeps the hierarchy a customer
+          // browses by while adding search and multi-select, and it lists what
+          // is chosen inside the control instead of leaving the selection to be
+          // read off highlighting. The admin's CategoryTreeSelect is the same
+          // control, so the two screens behave alike.
+          <TreeSelect
             treeData={toTreeData(buildCategoryTree(categories))}
-            selectedKeys={filters.categoryId === null ? [] : [filters.categoryId]}
-            onSelect={selectCategory}
-            defaultExpandAll
-            blockNode
+            value={filters.categoryIds}
+            onChange={selectCategories}
+            multiple
+            showSearch
+            // Search the visible label, not the value, which is a numeric id.
+            treeNodeFilterProp="title"
+            treeDefaultExpandAll
+            allowClear
+            placeholder="Any category"
+            style={{ width: '100%' }}
+            aria-label="Filter by category"
           />
         ) : (
           <Empty image={Empty.PRESENTED_IMAGE_SIMPLE} description="No categories yet" />
@@ -122,42 +165,55 @@ export default function FilterDrawer({
       </section>
 
       <section style={{ marginBottom: 28 }}>
-        <h4 style={{ margin: '0 0 8px', fontSize: 12, letterSpacing: '.06em', textTransform: 'uppercase', opacity: 0.65 }}>
-          Tags — must have all
+        <h4 style={sectionHeading}>
+          Tags — must have all of these
         </h4>
         {tags.length ? (
-          <div style={{ display: 'flex', flexWrap: 'wrap', gap: 6 }}>
-            {tags.map((tag) => {
-              const selected = filters.tagIds.includes(tag.id);
-              return (
-                // A real button rather than a styled span, so the pills are
-                // reachable by keyboard and announce their on/off state.
-                <button
-                  key={tag.id}
-                  type="button"
-                  aria-pressed={selected}
-                  onClick={() => toggleTag(tag.id)}
-                  style={{ background: 'none', border: 'none', padding: 0, cursor: 'pointer' }}
-                >
-                  <Tag
-                    color={selected ? tag.color : undefined}
-                    style={{ margin: 0, opacity: selected ? 1 : 0.75 }}
-                  >
-                    {tag.name}
-                  </Tag>
-                </button>
-              );
-            })}
-          </div>
+          // Was a wall of every tag in the system, which read fine at a dozen
+          // and not at a hundred. A searchable multi-select scales with the
+          // taxonomy and, like the category control above it, states its
+          // selection inside the control instead of in chip colouring.
+          //
+          // The colours survive as the selected pills, since that is the only
+          // place a tag's colour was ever load-bearing.
+          <Select
+            mode="multiple"
+            showSearch
+            optionFilterProp="label"
+            allowClear
+            placeholder="Any tags"
+            style={{ width: '100%' }}
+            aria-label="Filter by tags"
+            value={filters.tagIds}
+            onChange={(tagIds: number[]) => onChange({ ...filters, tagIds })}
+            options={tags.map((tag) => ({ value: tag.id, label: tag.name }))}
+            tagRender={({ value, label, closable, onClose }) => (
+              <Tag
+                color={tagColors.get(Number(value))}
+                closable={closable}
+                onClose={onClose}
+                // antd's default, which the custom renderer replaces: without
+                // it the pill swallows the mousedown and reopens the list.
+                onMouseDown={(event) => {
+                  event.preventDefault();
+                  event.stopPropagation();
+                }}
+                style={{ marginInlineEnd: 4 }}
+              >
+                {label}
+              </Tag>
+            )}
+          />
         ) : (
           <Empty image={Empty.PRESENTED_IMAGE_SIMPLE} description="No tags yet" />
         )}
       </section>
 
-      <section>
-        <h4 style={{ margin: '0 0 8px', fontSize: 12, letterSpacing: '.06em', textTransform: 'uppercase', opacity: 0.65 }}>
+      <section style={showStatus ? { marginBottom: 28 } : undefined}>
+        <h4 style={sectionHeading}>
           Price
         </h4>
+        {priceRange && (
         <Slider
           range
           min={bounds.min_cents}
@@ -177,6 +233,7 @@ export default function FilterDrawer({
             })
           }
         />
+        )}
         <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginTop: 8 }}>
           <InputNumber
             aria-label="Minimum price"
@@ -197,6 +254,41 @@ export default function FilterDrawer({
           />
         </div>
       </section>
+
+      {showStatus && (
+        <section>
+          <h4 style={sectionHeading}>
+            Status — any of these
+          </h4>
+          {/* The status dimension itself rather than presets over it, which
+              #105's Sold / Not sold / All control was. Presets could not express
+              Published or Unpublished, could not isolate Reserved, and would
+              have grown a new button for every new question. Selecting statuses
+              answers all of them: Unpublished is Pending, Published is the other
+              three, and Not sold is everything except Sold.
+
+              A second control for publication would have read more naturally and
+              reintroduced what #105 avoided — Sold and Unpublished is an
+              impossible pair, since a sold item is necessarily published. One
+              dimension cannot contradict itself. See #132. */}
+          <Select
+            allowClear
+            mode="multiple"
+            showSearch
+            optionFilterProp="label"
+            placeholder="Any status"
+            aria-label="Filter by status"
+            style={{ width: '100%' }}
+            value={filters.status ?? []}
+            onChange={(value: ItemStatus[]) =>
+              // Empty means no filter, not "no statuses". A multi-select cleared
+              // back to nothing should show everything rather than an empty table.
+              onChange({ ...filters, status: value.length ? value : null })
+            }
+            options={STATUS_OPTIONS}
+          />
+        </section>
+      )}
     </Drawer>
   );
 }

frontend/src/filters.ts

@@ -3,7 +3,14 @@ import type { Category } from './api';
 export type ItemStatus = 'pending' | 'available' | 'reserved' | 'sold';
 
 export interface ItemFilters {
-  categoryId: number | null;
+  // Several categories, combined as OR — picking Furniture and Decor means
+  // either, not the empty intersection. Deliberately the opposite of tagIds
+  // below, which is AND, and both controls label their rule so the difference
+  // is stated rather than discovered.
+  //
+  // The admin's inventory filter is single-select and holds a list of one; the
+  // type is shared, and one shape is better than two that drift.
+  categoryIds: number[];
   tagIds: number[];
   minPriceCents: number | null;
   maxPriceCents: number | null;
@@ -69,7 +76,7 @@ export function saleStateFromStatuses(
 }
 
 export const EMPTY_FILTERS: ItemFilters = {
-  categoryId: null,
+  categoryIds: [],
   tagIds: [],
   minPriceCents: null,
   maxPriceCents: null,
@@ -82,7 +89,9 @@ export const EMPTY_FILTERS: ItemFilters = {
 // what GET /api/items accepts, so the same object serializes for both.
 export function filtersToSearchParams(filters: ItemFilters): URLSearchParams {
   const params = new URLSearchParams();
-  if (filters.categoryId !== null) params.set('category', String(filters.categoryId));
+  // Comma-separated under the singular name it has always had, so a link
+  // written before this went multi-valued still means what it meant.
+  if (filters.categoryIds.length) params.set('category', filters.categoryIds.join(','));
   if (filters.tagIds.length) params.set('tags', filters.tagIds.join(','));
   if (filters.minPriceCents !== null) params.set('min_price', String(filters.minPriceCents));
   if (filters.maxPriceCents !== null) params.set('max_price', String(filters.maxPriceCents));
@@ -98,6 +107,11 @@ function readInt(raw: string | null): number | null {
 }
 
 export function filtersFromSearchParams(params: URLSearchParams): ItemFilters {
+  const categories = (params.get('category') || '')
+    .split(',')
+    .map((part) => readInt(part))
+    .filter((id): id is number => id !== null && id > 0);
+
   const tags = (params.get('tags') || '')
     .split(',')
     .map((part) => readInt(part))
@@ -127,7 +141,7 @@ export function filtersFromSearchParams(params: URLSearchParams): ItemFilters {
   const favorites = params.get('favorites');
 
   return {
-    categoryId: readInt(params.get('category')),
+    categoryIds: categories,
     tagIds: tags,
     minPriceCents: readInt(params.get('min_price')),
     maxPriceCents: readInt(params.get('max_price')),
@@ -143,9 +157,27 @@ export function filtersFromSearchParams(params: URLSearchParams): ItemFilters {
 // beside this button rather than living in the drawer, so counting it would put
 // a number on a button whose drawer shows nothing set — and the control already
 // displays its own position.
+// Named individually rather than grouped, because grouping is what the preset
+// this replaced did. Pending is listed first: "what is waiting to be published"
+// is the question that prompted #132.
+//
+// Here rather than in the admin screen because the drawer and the active-filter
+// chips both need to turn a status into a label, and a second copy of this list
+// is a second place for a new status to be forgotten.
+export const STATUS_OPTIONS: { value: ItemStatus; label: string }[] = [
+  { value: 'pending', label: 'Pending' },
+  { value: 'available', label: 'Available' },
+  { value: 'reserved', label: 'Reserved' },
+  { value: 'sold', label: 'Sold' }
+];
+
+export function statusLabel(status: ItemStatus): string {
+  return STATUS_OPTIONS.find((option) => option.value === status)?.label ?? status;
+}
+
 export function activeFilterCount(filters: ItemFilters): number {
   let count = 0;
-  if (filters.categoryId !== null) count++;
+  count += filters.categoryIds.length;
   count += filters.tagIds.length;
   if (filters.minPriceCents !== null || filters.maxPriceCents !== null) count++;
   if (filters.favoritesOnly) count++;

frontend/tests/e2e/admin-inventory-filters.spec.ts

@@ -43,8 +43,7 @@ test.describe('Admin inventory filters', () => {
     await admin.goto();
     await adminInventory.filterByCategory(NAMES.category, NAMES.cheap);
 
-    await adminInventory.minimumPrice.fill('100');
-    await adminInventory.maximumPrice.fill('500');
+    await adminInventory.setPriceRange('100', '500');
 
     await expect(adminInventory.row(NAMES.mid)).toBeVisible();
     await expect(adminInventory.row(NAMES.cheap)).toHaveCount(0);
@@ -111,16 +110,20 @@ test.describe('Admin inventory filters', () => {
   test('combines filters, and clearing restores them', async ({ admin, adminInventory }) => {
     await admin.goto();
     await adminInventory.filterByCategory(NAMES.category, NAMES.cheap);
-    await adminInventory.minimumPrice.fill('800');
+    await adminInventory.setPriceRange('800');
     await expect(adminInventory.row(NAMES.cheap)).toHaveCount(0);
     await expect(adminInventory.row(NAMES.dear)).toBeVisible();
 
-    await adminInventory.clearFiltersButton.click();
+    await adminInventory.clearFilters();
 
     // Asserting on the controls rather than on the rows: with the filters gone
     // the table is the whole paginated catalogue again, so a given fixture is
     // not reliably on the first page.
+    //
+    // The chip row renders only while something is filtered, and the button's
+    // tally is the other half of the same claim — nothing is filtered, and the
+    // screen says so without the drawer being opened to check.
     await expect(adminInventory.clearFiltersButton).toHaveCount(0);
-    await expect(adminInventory.minimumPrice).toHaveValue('');
+    await expect(adminInventory.filtersButton).toHaveText('Filters');
   });
 });

frontend/tests/e2e/filters.spec.ts

@@ -89,6 +89,46 @@ test.describe('Storefront filters', () => {
     await expect(storefront.card(NAMES.midItem)).toBeHidden();
   });
 
+  test('several categories combine as any-of rather than all-of', async ({
+    page,
+    storefront,
+    filterDrawer
+  }) => {
+    await storefront.goto();
+    await storefront.openFilters();
+
+    // Different branches with no items in common, so an AND would show nothing.
+    await filterDrawer.chooseCategories(NAMES.tables, NAMES.decor);
+
+    await expect(storefront.card(NAMES.deepItem)).toBeVisible();
+    await expect(storefront.card(NAMES.otherItem)).toBeVisible();
+    // Filed directly in Furniture, which was not among the selections.
+    await expect(storefront.card(NAMES.midItem)).toBeHidden();
+
+    // Both ride in the one parameter the filter has always used, so links
+    // written before it went multi-valued still mean what they meant.
+    //
+    // The separator arrives percent-encoded because URLSearchParams encodes a
+    // comma, which is how the `tags` parameter has always looked too. Either
+    // spelling parses, so the assertion accepts both rather than pinning the
+    // encoding.
+    await expect(page).toHaveURL(/category=\d+(,|%2C)\d+/);
+  });
+
+  test('each selected category gets its own removable chip', async ({ storefront, filterDrawer }) => {
+    await storefront.goto();
+    await storefront.openFilters();
+    await filterDrawer.chooseCategories(NAMES.tables, NAMES.decor);
+    await filterDrawer.close();
+
+    await storefront.removeFilterChip(NAMES.decor).click();
+
+    // Removing one chip narrows the filter to the other rather than clearing
+    // the category filter outright.
+    await expect(storefront.card(NAMES.deepItem)).toBeVisible();
+    await expect(storefront.card(NAMES.otherItem)).toBeHidden();
+  });
+
   test('requires every selected tag rather than any of them', async ({ storefront, filterDrawer }) => {
     await storefront.goto();
     await storefront.openFilters();

frontend/tests/e2e/pages/AdminInventory.ts

@@ -81,6 +81,31 @@ export class AdminInventory {
   }
 
   // ---- The inventory filter bar ----
+  //
+  // The controls moved into the storefront's flyout (#169), so each method here
+  // opens the drawer, acts, and closes it again. Closing matters: the drawer
+  // overlays the table, and every assertion in these specs is about rows.
+
+  get filtersButton(): Locator {
+    return this.page.getByRole('button', { name: 'Filters' });
+  }
+
+  get filterDrawer(): Locator {
+    return this.page.getByRole('dialog', { name: 'Filters' });
+  }
+
+  /**
+   * The chip row's own "Clear all", scoped to the group so it stays distinct
+   * from the identically-labelled button in the drawer's footer.
+   *
+   * It exists only while something is filtered, which is what lets a spec assert
+   * that clearing worked by its absence.
+   */
+  get clearFiltersButton(): Locator {
+    return this.page
+      .getByRole('group', { name: 'Active filters' })
+      .getByRole('button', { name: 'Clear all' });
+  }
 
   get categoryFilter(): Locator {
     return this.page.getByRole('combobox', { name: 'Filter by category' });
@@ -98,30 +123,37 @@ export class AdminInventory {
     return this.page.getByLabel('Maximum price');
   }
 
-  get clearFiltersButton(): Locator {
-    return this.page.getByRole('button', { name: 'Clear filters' });
+  /** Opens the flyout, or leaves it open if it already is. */
+  async openFilters(): Promise<void> {
+    if (await this.filterDrawer.isVisible().catch(() => false)) return;
+    await this.filtersButton.click();
+    await expect(this.filterDrawer).toBeVisible();
+  }
+
+  /** Closes it through the footer button, which is what a person would click. */
+  async closeFilters(): Promise<void> {
+    await this.filterDrawer.getByRole('button', { name: /^Show / }).click();
+    await expect(this.filterDrawer).toBeHidden();
   }
 
   /**
    * Toggles one status in the multi-select. Clicking a selected option removes
    * it, which is what the clearing test relies on.
    *
-   * Two antd details decide this locator. It renders an invisible role="listbox"
-   * shim beside the real list for accessibility, so getByRole('option') finds
-   * something zero-sized that cannot be clicked. And once a status is selected
-   * it also renders as a tag carrying the same title as the option, so an
-   * unscoped getByTitle becomes ambiguous. Matching the visible option class
-   * avoids both.
-   *
-   * The dropdown is opened only when it is not already open: antd keeps it open
-   * after a selection in multiple mode, so clicking the box again would close it.
+   * The option is matched by class rather than by role because antd renders an
+   * invisible role="listbox" shim beside the real list for accessibility, so
+   * getByRole('option') finds something zero-sized that cannot be clicked; and
+   * once a status is selected it also renders as a tag carrying the same title,
+   * so an unscoped getByTitle becomes ambiguous.
    */
   async toggleStatus(label: string): Promise<void> {
+    await this.openFilters();
     const option = this.page.locator(`.ant-select-item-option[title="${label}"]`);
     if (!(await option.isVisible().catch(() => false))) {
       await this.statusFilter.click();
     }
     await option.click();
+    await this.closeFilters();
   }
 
   /**
@@ -131,14 +163,32 @@ export class AdminInventory {
    * unfiltered page 1 is not a reliable place to look for a fixture. Waiting for
    * a known row is the action's contract — the filter has been applied when the
    * table has re-rendered under it.
+   *
+   * Typing the name before clicking it is not for realism: the tree is
+   * virtualized, so against a database holding hundreds of categories the wanted
+   * row is never rendered until a search narrows to it.
    */
   async filterByCategory(categoryName: string, expectedRow: string): Promise<void> {
+    await this.openFilters();
     await this.categoryFilter.click();
     await this.categoryFilter.fill(categoryName);
-    await this.page.getByTitle(categoryName, { exact: true }).click();
+    await this.page.getByRole('treeitem', { name: categoryName }).click();
+    await this.closeFilters();
     await expect(this.row(expectedRow)).toBeVisible();
   }
 
+  /** Sets either end of the price range, leaving an omitted end untouched. */
+  async setPriceRange(minimum?: string, maximum?: string): Promise<void> {
+    await this.openFilters();
+    if (minimum !== undefined) await this.minimumPrice.fill(minimum);
+    if (maximum !== undefined) await this.maximumPrice.fill(maximum);
+    await this.closeFilters();
+  }
+
+  async clearFilters(): Promise<void> {
+    await this.clearFiltersButton.click();
+  }
+
   async openItemForm(): Promise<void> {
     await this.addItemButton.click();
   }

frontend/tests/e2e/pages/FilterDrawer.ts

@@ -3,13 +3,26 @@ import { Locator, Page, expect } from '@playwright/test';
 /**
  * The storefront's filter drawer.
  *
- * Categories are a tree rather than a list, because a category filter matches
- * the node and everything filed beneath it — so the locator is `treeitem`, and
- * a nested category is only reachable once the tree has loaded its data.
+ * Both taxonomy filters are searchable multi-selects whose options only exist
+ * while the list is open, so every choose/toggle here opens the list, acts, and
+ * closes it again.
  *
- * Tags are buttons that toggle. The rule they follow is AND, not OR: selecting
- * two tags means "must have both", which is deliberately different from how
- * categories combine and is the thing several tests exist to pin down.
+ * Each one types the name before clicking it. Not for realism — the lists are
+ * virtualized, so against a database holding hundreds of categories the wanted
+ * row is never rendered until a search narrows to it. Scrolling to it would be
+ * testing the virtual list rather than the filter.
+ *
+ * Categories keep their hierarchy — a category filter matches the node and
+ * everything filed beneath it — so their options are `treeitem`.
+ *
+ * Tags are flat, and their options are matched by class rather than by role,
+ * for the reason AdminInventory.toggleStatus records: antd renders an invisible
+ * role="listbox" shim beside the real list, so getByRole('option') resolves to
+ * something zero-sized that can never be clicked.
+ *
+ * The two follow opposite rules, which is the thing several tests exist to pin
+ * down: categories are OR (any of the selected branches), tags are AND (the
+ * item must carry all of them).
  */
 export class FilterDrawer {
   readonly minimumPrice: Locator;
@@ -17,6 +30,9 @@ export class FilterDrawer {
   readonly closeButton: Locator;
   readonly clearAllButton: Locator;
   readonly favoritesOnlySwitch: Locator;
+  readonly categorySelect: Locator;
+  readonly tagSelect: Locator;
+  readonly title: Locator;
 
   constructor(private readonly page: Page) {
     this.minimumPrice = page.getByLabel('Minimum price');
@@ -24,6 +40,11 @@ export class FilterDrawer {
     this.closeButton = page.getByRole('button', { name: 'Close' });
     this.clearAllButton = page.getByRole('button', { name: 'Clear all' });
     this.favoritesOnlySwitch = page.getByRole('switch', { name: 'Only my favorites' });
+    this.categorySelect = page.getByRole('combobox', { name: 'Filter by category' });
+    this.tagSelect = page.getByRole('combobox', { name: 'Filter by tags' });
+    // Somewhere inside the drawer that is inert and never covered by an
+    // option list, which opens downward from the controls below it.
+    this.title = page.getByRole('heading', { name: 'Favorites' });
   }
 
   category(name: string): Locator {
@@ -31,15 +52,62 @@ export class FilterDrawer {
   }
 
   tag(name: string): Locator {
-    return this.page.getByRole('button', { name });
+    return this.page.locator(`.ant-select-item-option[title="${name}"]`);
   }
 
-  async chooseCategory(name: string): Promise<void> {
+  /**
+   * Opens the category list and leaves it open.
+   *
+   * Separate from choosing, so a test that picks two categories opens once —
+   * which is also what a customer does, the list staying open being the point
+   * of a multi-select.
+   */
+  async openCategoryList(): Promise<void> {
+    await this.categorySelect.click();
+  }
+
+  /**
+   * Narrows to one category and clicks it, with the list already open.
+   *
+   * Selecting clears the search box, so consecutive calls each start from the
+   * unfiltered list.
+   */
+  private async pickCategory(name: string): Promise<void> {
+    await this.categorySelect.fill(name);
     await this.category(name).click();
   }
 
+  /**
+   * Closes whichever option list is open, without closing the drawer.
+   *
+   * Escape would do both — the drawer listens for it too — so this clicks off
+   * the control instead, onto the one part of the drawer nothing overlaps.
+   */
+  async closeOptionList(): Promise<void> {
+    await this.title.click();
+  }
+
+  async chooseCategory(name: string): Promise<void> {
+    await this.openCategoryList();
+    await this.pickCategory(name);
+    await this.closeOptionList();
+  }
+
+  /** Picks several categories from one opening of the list, as the UI intends. */
+  async chooseCategories(...names: string[]): Promise<void> {
+    await this.openCategoryList();
+    for (const name of names) {
+      await this.pickCategory(name);
+    }
+    await this.closeOptionList();
+  }
+
+  /** Clicking a selected option in a multi-select deselects it, so this toggles. */
   async toggleTag(name: string): Promise<void> {
+    await this.tagSelect.click();
+    await this.tagSelect.fill(name);
     await this.tag(name).click();
+    await this.closeOptionList();
   }
 
   async setPriceRange(minimum?: string, maximum?: string): Promise<void> {