feat: question filters

.prettierignore

@@ -1,4 +1,6 @@
 build
 .firebase
 storybook-static
-dist
+dist
+firestore.indexes.json
+firebase.json

firebase.json

@@ -1,7 +1,12 @@
 {
+  "$schema": "./node_modules/firebase-tools/schema/firebase-config.json",
   "hosting": {
     "public": "build",
-    "ignore": ["firebase.json", "**/.*", "**/node_modules/**"],
+    "ignore": [
+      "firebase.json",
+      "**/.*",
+      "**/node_modules/**"
+    ],
     "rewrites": [
       {
         "source": "/api",
@@ -86,7 +91,9 @@
     ]
   },
   "functions": {
-    "predeploy": ["yarn workspace functions build"],
+    "predeploy": [
+      "yarn workspace functions build"
+    ],
     "source": "functions/dist",
     "runtime": "nodejs20"
   },
@@ -122,5 +129,8 @@
   },
   "extensions": {
     "firestore-send-email": "firebase/firestore-send-email@0.1.27"
+  },
+  "firestore": {
+    "indexes": "./firestore.indexes.json"
   }
-}
+}

firestore.indexes.json

@@ -0,0 +1,151 @@
+{
+  "indexes": [
+    {
+      "collectionGroup": "research_rev20201020",
+      "queryScope": "COLLECTION",
+      "fields": [
+        {
+          "fieldPath": "_createdBy",
+          "order": "ASCENDING"
+        },
+        {
+          "fieldPath": "votedUsefulBy",
+          "order": "ASCENDING"
+        }
+      ]
+    },
+    {
+      "collectionGroup": "research_rev20201020",
+      "queryScope": "COLLECTION",
+      "fields": [
+        {
+          "fieldPath": "collaborators",
+          "arrayConfig": "CONTAINS"
+        },
+        {
+          "fieldPath": "votedUsefulBy",
+          "order": "ASCENDING"
+        }
+      ]
+    },
+    {
+      "collectionGroup": "research_rev20201020",
+      "queryScope": "COLLECTION",
+      "fields": [
+        {
+          "fieldPath": "moderation",
+          "order": "ASCENDING"
+        },
+        {
+          "fieldPath": "votedUsefulBy",
+          "order": "ASCENDING"
+        }
+      ]
+    },
+    {
+      "collectionGroup": "v3_howtos",
+      "queryScope": "COLLECTION",
+      "fields": [
+        {
+          "fieldPath": "_createdBy",
+          "order": "ASCENDING"
+        },
+        {
+          "fieldPath": "moderation",
+          "order": "ASCENDING"
+        },
+        {
+          "fieldPath": "votedUsefulBy",
+          "order": "ASCENDING"
+        }
+      ]
+    },
+    {
+      "collectionGroup": "v3_howtos",
+      "queryScope": "COLLECTION",
+      "fields": [
+        {
+          "fieldPath": "_createdBy",
+          "order": "ASCENDING"
+        },
+        {
+          "fieldPath": "votedUsefulBy",
+          "order": "ASCENDING"
+        }
+      ]
+    },
+    {
+      "collectionGroup": "v3_howtos",
+      "queryScope": "COLLECTION",
+      "fields": [
+        {
+          "fieldPath": "_deleted",
+          "order": "ASCENDING"
+        },
+        {
+          "fieldPath": "_modified",
+          "order": "ASCENDING"
+        }
+      ]
+    },
+    {
+      "collectionGroup": "v3_howtos",
+      "queryScope": "COLLECTION",
+      "fields": [
+        {
+          "fieldPath": "moderation",
+          "order": "ASCENDING"
+        },
+        {
+          "fieldPath": "votedUsefulBy",
+          "order": "ASCENDING"
+        }
+      ]
+    },
+    {
+      "collectionGroup": "questions_rev20230926",
+      "queryScope": "COLLECTION",
+      "fields": [
+        {
+          "fieldPath": "_created",
+          "order": "DESCENDING"
+        },
+        {
+          "fieldPath": "_modified",
+          "order": "DESCENDING"
+        },
+        {
+          "fieldPath": "commentCount",
+          "order": "ASCENDING"
+        },
+        {
+          "fieldPath": "commentCount",
+          "order": "DESCENDING"
+        },
+        {
+          "fieldPath": "latestCommentDate",
+          "order": "DESCENDING"
+        }
+      ]
+    },
+    {
+      "collectionGroup": "questions_rev20230926",
+      "queryScope": "COLLECTION",
+      "fields": [
+        {
+          "fieldPath": "questionCategory._id",
+          "order": "ASCENDING"
+        },
+        {
+          "fieldPath": "_created",
+          "order": "DESCENDING"
+        },
+        {
+          "fieldPath": "__name__",
+          "order": "DESCENDING"
+        }
+      ]
+    }
+  ],
+  "fieldOverrides": []
+}

jest.config.ts

@@ -0,0 +1,8 @@
+import type { JestConfigWithTsJest } from 'ts-jest'
+
+const config: JestConfigWithTsJest = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+}
+
+export default config

package.json

@@ -175,6 +175,7 @@
     "start-server-and-test": "^1.11.0",
     "stream-browserify": "^3.0.0",
     "terser": "3.14.1",
+    "ts-jest": "^29.1.2",
     "ts-loader": "^7.0.5",
     "typescript": "^5.1.6",
     "wait-on": "^5.2.1",

src/pages/Howto/Category/CategoriesSelect.tsx

@@ -6,18 +6,19 @@ import { FieldContainer } from '../../../common/Form/FieldContainer'
 
 import type { ICategory } from 'src/models/categories.model'
 
+/**
+ * @deprecated in favor of CategoriesSelectV2
+ */
 export const CategoriesSelect = observer(
   ({ value, onChange, placeholder, isForm, type }) => {
+    const { categoriesStore, researchCategoriesStore } =
+      useCommonStores().stores
+
     let categories: ICategory[] = []
     if (type === 'howto') {
-      const { categoriesStore } = useCommonStores().stores
       categories = categoriesStore.allCategories
     } else if (type === 'research') {
-      const { researchCategoriesStore } = useCommonStores().stores
       categories = researchCategoriesStore.allResearchCategories
-    } else if (type === 'question') {
-      const { questionCategoriesStore } = useCommonStores().stores
-      categories = questionCategoriesStore.allQuestionCategories
     }
 
     const selectOptions = categories

src/pages/Question/QuestionFilterHeader.tsx

@@ -0,0 +1,120 @@
+import { useCallback, useEffect, useState } from 'react'
+import { useSearchParams } from 'react-router-dom'
+import debounce from 'debounce'
+import { Select } from 'oa-components'
+import { FieldContainer } from 'src/common/Form/FieldContainer'
+import { Flex, Input } from 'theme-ui'
+
+import { CategoriesSelectV2 } from '../common/Category/CategoriesSelectV2'
+import { listing } from './labels'
+import { questionService } from './question.service'
+import { QuestionSortOptions } from './QuestionSortOptions'
+
+import type { SelectValue } from '../common/Category/CategoriesSelectV2'
+
+type QuestionSearchParams = 'category' | 'q' | 'sort'
+
+export const QuestionFilterHeader = () => {
+  const [categories, setCategories] = useState<SelectValue[]>([])
+
+  const [searchParams, setSearchParams] = useSearchParams()
+  const categoryParam = searchParams.get('category')
+  const category = categories?.find((x) => x.value === categoryParam) ?? null
+  const q = searchParams.get('q')
+  const sort = searchParams.get('sort')
+
+  const _inputStyle = {
+    width: ['100%', '100%', '200px'],
+    mr: [0, 0, 2],
+    mb: [3, 3, 0],
+  }
+
+  useEffect(() => {
+    const initCategories = async () => {
+      const categories = (await questionService.getQuestionCategories()) || []
+      setCategories(
+        categories.map((x) => {
+          return { value: x._id, label: x.label }
+        }),
+      )
+    }
+
+    initCategories()
+  }, [])
+
+  const updateFilter = useCallback(
+    (key: QuestionSearchParams, value: string) => {
+      const params = new URLSearchParams(searchParams.toString())
+      if (value) {
+        params.set(key, value)
+      } else {
+        params.delete(key)
+      }
+      setSearchParams(params)
+    },
+    [searchParams],
+  )
+
+  const onSearchInputChange = useCallback(
+    debounce((value: string) => {
+      const params = new URLSearchParams(searchParams.toString())
+      params.set('q', value)
+
+      if (value.length > 0 && sort !== QuestionSortOptions.MostRelevant) {
+        params.set('sort', QuestionSortOptions.MostRelevant)
+      }
+
+      if (value.length === 0 || !value) {
+        params.set('sort', QuestionSortOptions.Newest)
+      }
+
+      setSearchParams(params)
+    }, 500),
+    [searchParams],
+  )
+
+  return (
+    <Flex
+      sx={{
+        flexWrap: 'nowrap',
+        justifyContent: 'space-between',
+        flexDirection: ['column', 'column', 'row'],
+        mb: 3,
+      }}
+    >
+      <Flex sx={_inputStyle}>
+        <CategoriesSelectV2
+          value={category}
+          onChange={(updatedCategory) =>
+            updateFilter('category', updatedCategory)
+          }
+          placeholder={listing.filterCategory}
+          isForm={false}
+          categories={categories}
+        />
+      </Flex>
+      <Flex sx={_inputStyle}>
+        <FieldContainer>
+          <Select
+            options={Object.values(QuestionSortOptions).map((x) => ({
+              label: x.toString(),
+              value: x.toString(),
+            }))}
+            placeholder={listing.sort}
+            value={{ label: sort, value: sort }}
+            onChange={(sortBy) => updateFilter('sort', sortBy.label)}
+          />
+        </FieldContainer>
+      </Flex>
+      <Flex sx={_inputStyle}>
+        <Input
+          variant="inputOutline"
+          data-cy="questions-search-box"
+          defaultValue={q || ''}
+          placeholder={listing.search}
+          onChange={(e) => onSearchInputChange(e.target.value)}
+        />
+      </Flex>
+    </Flex>
+  )
+}

src/pages/Question/QuestionListing.tsx

@@ -1,5 +1,5 @@
-import { Link } from 'react-router-dom'
-import { observer } from 'mobx-react'
+import { useEffect, useState } from 'react'
+import { Link, useSearchParams } from 'react-router-dom'
 import {
   Button,
   Category,
@@ -7,17 +7,81 @@ import {
   Loader,
   ModerationStatus,
 } from 'oa-components'
-import { useQuestionStore } from 'src/stores/Question/question.store'
+import { logger } from 'src/logger'
+import { questionService } from 'src/pages/Question/question.service'
 import { Box, Card, Flex, Grid, Heading } from 'theme-ui'
 
-import { SortFilterHeader } from '../common/SortFilterHeader/SortFilterHeader'
 import { UserNameTag } from '../common/UserNameTag/UserNameTag'
+import { ITEMS_PER_PAGE } from './constants'
+import { headings, listing } from './labels'
+import { QuestionFilterHeader } from './QuestionFilterHeader'
+import { QuestionSortOptions } from './QuestionSortOptions'
 
-import type { IQuestionDB } from 'src/models'
+import type { DocumentData, QueryDocumentSnapshot } from 'firebase/firestore'
+import type { IQuestion } from 'src/models'
 
-export const QuestionListing = observer(() => {
-  const store = useQuestionStore()
-  const { filteredQuestions, isFetching } = store
+export const QuestionListing = () => {
+  const [isFetching, setIsFetching] = useState<boolean>(true)
+  const [questions, setQuestions] = useState<IQuestion.Item[]>([])
+  const [total, setTotal] = useState<number>(0)
+  const [lastVisible, setLastVisible] = useState<
+    QueryDocumentSnapshot<DocumentData, DocumentData> | undefined
+  >(undefined)
+
+  const [searchParams, setSearchParams] = useSearchParams()
+  const q = searchParams.get('q') || ''
+  const category = searchParams.get('category') || ''
+  const sort = searchParams.get('sort') as QuestionSortOptions
+
+  useEffect(() => {
+    if (!sort) {
+      // ensure sort is set
+      const params = new URLSearchParams(searchParams.toString())
+
+      if (q) {
+        params.set('sort', QuestionSortOptions.MostRelevant)
+      } else {
+        params.set('sort', QuestionSortOptions.Newest)
+      }
+      setSearchParams(params)
+    } else {
+      // search only when sort is set (avoids duplicate requests)
+      fetchQuestions()
+    }
+  }, [q, category, sort])
+
+  const fetchQuestions = async (
+    skipFrom?: QueryDocumentSnapshot<DocumentData, DocumentData>,
+  ) => {
+    setIsFetching(true)
+
+    try {
+      const searchWords = q ? q.toLocaleLowerCase().split(' ') : []
+
+      const result = await questionService.search(
+        searchWords,
+        category,
+        sort,
+        skipFrom,
+        ITEMS_PER_PAGE,
+      )
+
+      if (skipFrom) {
+        // if skipFrom is set, means we are requesting another page that should be appended
+        setQuestions((questions) => [...questions, ...result.items])
+      } else {
+        setQuestions(result.items)
+      }
+
+      setLastVisible(result.lastVisible)
+
+      setTotal(result.total)
+    } catch (error) {
+      logger.error('error fetching questions', error)
+    }
+
+    setIsFetching(false)
+  }
 
   return (
     <>
@@ -30,7 +94,7 @@ export const QuestionListing = observer(() => {
             fontSize: 5,
           }}
         >
-          Ask your questions and help others out
+          {headings.list}
         </Heading>
       </Flex>
       <Flex
@@ -41,100 +105,112 @@ export const QuestionListing = observer(() => {
           flexDirection: ['column', 'column', 'row'],
         }}
       >
-        <SortFilterHeader store={store} type="question" />
-        <Link to={'/questions/create'}>
-          <Button variant={'primary'}>Ask a question</Button>
+        <QuestionFilterHeader />
+        <Link to="/questions/create">
+          <Button variant="primary">{listing.create}</Button>
         </Link>
       </Flex>
-      {isFetching ? (
-        <Loader />
-      ) : filteredQuestions && filteredQuestions.length ? (
-        filteredQuestions
-          .filter(
-            (q: IQuestionDB) => q.moderation && q.moderation === 'accepted',
-          )
-          .map((q: IQuestionDB, idx) => {
-            const url = `/questions/${encodeURIComponent(q.slug)}`
-            return (
-              <Card
-                key={idx}
-                mb={3}
-                px={3}
-                py={3}
-                sx={{ position: 'relative' }}
-              >
-                <Grid columns={[1, '3fr 1fr']} gap="40px">
-                  <Box sx={{ flexDirection: 'column' }}>
-                    <Link to={url} key={q._id}>
-                      <Flex
-                        sx={{
-                          width: '100%',
 
-                          flexDirection: ['column', 'row'],
-                          gap: [0, 3],
-                          mb: [1, 0],
+      {questions?.length === 0 && !isFetching && (
+        <Heading sx={{ marginTop: 4 }}>{listing.noQuestions}</Heading>
+      )}
+
+      {questions &&
+        questions.length > 0 &&
+        questions.map((question) => {
+          const url = `/questions/${encodeURIComponent(question.slug)}`
+          return (
+            <Card
+              key={question._id}
+              mb={3}
+              px={3}
+              py={3}
+              sx={{ position: 'relative' }}
+            >
+              <Grid columns={[1, '3fr 1fr']} gap="40px">
+                <Box sx={{ flexDirection: 'column' }}>
+                  <Link to={url} key={question._id}>
+                    <Flex
+                      sx={{
+                        width: '100%',
+
+                        flexDirection: ['column', 'row'],
+                        gap: [0, 3],
+                        mb: [1, 0],
+                      }}
+                    >
+                      <Heading
+                        as="span"
+                        mb={1}
+                        sx={{
+                          color: 'black',
+                          fontSize: [3, 3, 4],
                         }}
                       >
-                        <Heading
-                          as="span"
-                          mb={1}
-                          sx={{
-                            color: 'black',
-                            fontSize: [3, 3, 4],
-                          }}
-                        >
-                          {q.title}
-                        </Heading>
-                        {q.category && (
-                          <Category
-                            category={q.category}
-                            sx={{ fontSize: 2 }}
-                          />
-                        )}
-                      </Flex>
-                    </Link>
-                    <Flex>
-                      <ModerationStatus
-                        status={q.moderation}
-                        contentType="question"
-                        sx={{ top: 0, position: 'absolute', right: 0 }}
-                      />
-                      <UserNameTag
-                        userName={q._createdBy}
-                        countryCode={q.creatorCountry}
-                        created={q._created}
-                        action="Asked"
-                      />
+                        {question.title}
+                      </Heading>
+                      {question.questionCategory && (
+                        <Category
+                          category={question.questionCategory}
+                          sx={{ fontSize: 2 }}
+                        />
+                      )}
                     </Flex>
-                  </Box>
-                  <Box
-                    sx={{
-                      display: ['none', 'flex', 'flex'],
-                      alignItems: 'center',
-                      justifyContent: 'space-around',
-                    }}
-                  >
-                    <IconCountWithTooltip
-                      count={(q.votedUsefulBy || []).length}
-                      icon="star-active"
-                      text="How useful is it"
+                  </Link>
+                  <Flex>
+                    <ModerationStatus
+                      status={question.moderation}
+                      contentType="question"
+                      sx={{ top: 0, position: 'absolute', right: 0 }}
                     />
+                    <UserNameTag
+                      userName={question._createdBy}
+                      countryCode={question.creatorCountry}
+                      created={question._created}
+                      action="Asked"
+                    />
+                  </Flex>
+                </Box>
+                <Box
+                  sx={{
+                    display: ['none', 'flex', 'flex'],
+                    alignItems: 'center',
+                    justifyContent: 'space-around',
+                  }}
+                >
+                  <IconCountWithTooltip
+                    count={(question.votedUsefulBy || []).length}
+                    icon="star-active"
+                    text={listing.usefulness}
+                  />
 
-                    <IconCountWithTooltip
-                      count={(q as any).commentCount || 0}
-                      icon="comment"
-                      text="Total comments"
-                    />
-                  </Box>
-                </Grid>
-              </Card>
-            )
-          })
-      ) : (
-        <Heading sx={{ marginTop: 4 }}>
-          No questions have been asked yet
-        </Heading>
-      )}
+                  <IconCountWithTooltip
+                    count={(question as any).commentCount || 0}
+                    icon="comment"
+                    text={listing.totalComments}
+                  />
+                </Box>
+              </Grid>
+            </Card>
+          )
+        })}
+
+      {!isFetching &&
+        questions &&
+        questions.length > 0 &&
+        questions.length < total && (
+          <Flex
+            sx={{
+              justifyContent: 'center',
+            }}
+          >
+            <Button onClick={() => fetchQuestions(lastVisible)}>
+              {listing.loadMore}
+            </Button>
+          </Flex>
+        )}
+
+      {isFetching && <Loader />}
     </>
   )
-})
+}

src/pages/Question/QuestionSortOptions.ts

@@ -0,0 +1,8 @@
+export enum QuestionSortOptions {
+  MostRelevant = 'MostRelevant',
+  Newest = 'Newest',
+  LatestUpdated = 'LatestUpdated',
+  LatestComments = 'LatestComments',
+  Comments = 'MostComments',
+  LeastComments = 'LeastComments',
+}

src/pages/Question/constants.ts

@@ -1,3 +1,4 @@
 export const QUESTION_MIN_TITLE_LENGTH = 10
 export const QUESTION_MAX_TITLE_LENGTH = 60
 export const QUESTION_MAX_DESCRIPTION_LENGTH = 1000
+export const ITEMS_PER_PAGE = 25

src/pages/Question/labels.ts

@@ -9,6 +9,7 @@ export const buttons = {
 export const headings = {
   create: 'Ask your question to the community',
   edit: 'Edit your question to the community',
+  list: 'Ask your questions and help others out',
 }
 
 export const fields: ILabels = {
@@ -29,3 +30,14 @@ export const fields: ILabels = {
     placeholder: 'So what do you need to know?',
   },
 }
+
+export const listing = {
+  create: 'Ask a question',
+  noQuestions: 'No questions have been asked yet',
+  usefulness: 'How useful is it',
+  totalComments: 'Total comments',
+  filterCategory: 'Filter by category',
+  search: 'Search for a question',
+  sort: 'Sort by',
+  loadMore: 'Load More',
+}

src/pages/Question/question.routes.test.tsx

@@ -1,3 +1,4 @@
+/* eslint-disable max-classes-per-file */
 jest.mock('../../stores/common/module.store')
 
 import '@testing-library/jest-dom'
@@ -25,6 +26,7 @@ import { FactoryUser } from 'src/test/factories/User'
 import { testingThemeStyles } from 'src/test/utils/themeUtils'
 
 import { questionRouteElements } from './question.routes'
+import { questionService } from './question.service'
 
 import type { QuestionStore } from 'src/stores/Question/question.store'
 
@@ -94,10 +96,30 @@ class mockQuestionStoreClass implements Partial<QuestionStore> {
   userCanEditQuestion = true
 }
 
+jest.mock('./question.service', () => ({
+  questionService: {
+    search: jest.fn(),
+    getQuestionCategories: jest.fn(),
+  },
+}))
+
+const mockQuestionService: typeof questionService = {
+  getQuestionCategories: jest.fn(() => {
+    return new Promise((resolve) => {
+      resolve([])
+    })
+  }),
+  search: jest.fn(() => {
+    return new Promise((resolve) => {
+      resolve({ items: [], total: 0, lastVisible: undefined })
+    })
+  }),
+}
 const mockQuestionStore = new mockQuestionStoreClass()
 
 jest.mock('src/stores/Question/question.store')
 jest.mock('src/stores/Discussions/discussions.store')
+jest.mock('src/pages/Question/question.service')
 
 describe('question.routes', () => {
   beforeEach(() => {
@@ -116,11 +138,15 @@ describe('question.routes', () => {
   describe('/questions/', () => {
     it('renders a loading state', async () => {
       let wrapper
-      ;(useQuestionStore as any).mockReturnValue({
-        ...mockQuestionStore,
-        isFetching: true,
-        activeUser: mockActiveUser,
+      mockQuestionService.search = jest.fn(() => {
+        return new Promise((resolve) => {
+          setTimeout(
+            () => resolve({ items: [], total: 0, lastVisible: undefined }),
+            4000,
+          )
+        })
       })
+
       await act(async () => {
         wrapper = (await renderFn('/questions')).wrapper
         expect(wrapper.getByText(/loading/)).toBeInTheDocument()
@@ -129,11 +155,6 @@ describe('question.routes', () => {
 
     it('renders an empty state', async () => {
       let wrapper
-      ;(useQuestionStore as any).mockReturnValue({
-        ...mockQuestionStore,
-        fetchQuestions: jest.fn().mockResolvedValue([]),
-        activeUser: mockActiveUser,
-      })
 
       await act(async () => {
         wrapper = (await renderFn('/questions')).wrapper
@@ -158,19 +179,22 @@ describe('question.routes', () => {
       const questionTitle = faker.lorem.words(3)
       const questionSlug = faker.lorem.slug()
 
-      ;(useQuestionStore as any).mockReturnValue({
-        ...mockQuestionStore,
-        filteredQuestions: [
-          {
-            ...FactoryQuestionItem({
-              title: questionTitle,
-              slug: questionSlug,
-            }),
-            _id: '123',
-            moderation: 'accepted',
-          },
-        ],
-        activeUser: mockActiveUser,
+      questionService.search = jest.fn(() => {
+        return new Promise((resolve) => {
+          resolve({
+            items: [
+              {
+                ...FactoryQuestionItem({
+                  title: questionTitle,
+                  slug: questionSlug,
+                }),
+                _id: '123',
+              },
+            ],
+            total: 1,
+            lastVisible: undefined,
+          })
+        })
       })
 
       await act(async () => {

src/pages/Question/question.service.test.ts

@@ -0,0 +1,111 @@
+import '@testing-library/jest-dom'
+
+import { exportedForTesting } from './question.service'
+import { QuestionSortOptions } from './QuestionSortOptions'
+
+const mockWhere = jest.fn()
+const mockOrderBy = jest.fn()
+const mockLimit = jest.fn()
+jest.mock('firebase/firestore', () => ({
+  collection: jest.fn(),
+  query: jest.fn(),
+  and: jest.fn(),
+  where: (path, op, value) => mockWhere(path, op, value),
+  limit: (limit) => mockLimit(limit),
+  orderBy: (field, direction) => mockOrderBy(field, direction),
+}))
+
+jest.mock('../../stores/databaseV2/endpoints', () => ({
+  DB_ENDPOINTS: {
+    questions: 'questions',
+    questionCategories: 'questionCategories',
+  },
+}))
+
+jest.mock('../../config/config', () => ({
+  getConfigurationOption: jest.fn(),
+  FIREBASE_CONFIG: {
+    apiKey: 'AIyChVN',
+    databaseURL: 'https://test.firebaseio.com',
+    projectId: 'test',
+    storageBucket: 'test.appspot.com',
+  },
+  localStorage: jest.fn(),
+}))
+
+describe('question.search', () => {
+  it('searches for text', async () => {
+    // prepare
+    const words = ['test', 'text']
+
+    // act
+    exportedForTesting.createQueries(
+      words,
+      '',
+      QuestionSortOptions.MostRelevant,
+    )
+
+    // assert
+    expect(mockWhere).toHaveBeenCalledWith(
+      'keywords',
+      'array-contains-any',
+      words,
+    )
+  })
+
+  it('filters by category', async () => {
+    // prepare
+    const category = 'cat1'
+
+    // act
+    exportedForTesting.createQueries(
+      [],
+      category,
+      QuestionSortOptions.MostRelevant,
+    )
+
+    // assert
+    expect(mockWhere).toHaveBeenCalledWith(
+      'questionCategory._id',
+      '==',
+      category,
+    )
+  })
+
+  it('should not call orderBy if sorting by most relevant', async () => {
+    // act
+    exportedForTesting.createQueries(
+      ['test'],
+      '',
+      QuestionSortOptions.MostRelevant,
+    )
+
+    // assert
+    expect(mockOrderBy).toHaveBeenCalledTimes(0)
+  })
+
+  it('should call orderBy when sorting is not MostRelevant', async () => {
+    // act
+    exportedForTesting.createQueries(['test'], '', QuestionSortOptions.Newest)
+
+    // assert
+    expect(mockOrderBy).toHaveBeenLastCalledWith('_created', 'desc')
+  })
+
+  it('should limit results', async () => {
+    // prepare
+    const take = 12
+
+    // act
+    exportedForTesting.createQueries(
+      ['test'],
+      '',
+      QuestionSortOptions.Newest,
+      undefined,
+      take,
+    )
+
+    // assert
+    expect(mockLimit).toHaveBeenLastCalledWith(take)
+  })
+})

src/pages/Question/question.service.ts

@@ -0,0 +1,127 @@
+import {
+  and,
+  collection,
+  getCountFromServer,
+  getDocs,
+  limit,
+  orderBy,
+  query,
+  startAfter,
+  where,
+} from 'firebase/firestore'
+
+import { DB_ENDPOINTS } from '../../models'
+import { firestore } from '../../utils/firebase'
+import { QuestionSortOptions } from './QuestionSortOptions'
+
+import type {
+  DocumentData,
+  QueryDocumentSnapshot,
+  QueryFilterConstraint,
+  QueryNonFilterConstraint,
+} from 'firebase/firestore'
+import type { IQuestion } from '../../models'
+import type { ICategory } from '../../models/categories.model'
+
+const search = async (
+  words: string[],
+  category: string,
+  sort: QuestionSortOptions,
+  snapshot?: QueryDocumentSnapshot<DocumentData, DocumentData>,
+  take: number = 10,
+) => {
+  const { itemsQuery, countQuery } = createQueries(
+    words,
+    category,
+    sort,
+    snapshot,
+    take,
+  )
+
+  const documentSnapshots = await getDocs(itemsQuery)
+  const lastVisible = documentSnapshots.docs
+    ? documentSnapshots.docs[documentSnapshots.docs.length - 1]
+    : undefined
+
+  const items = documentSnapshots.docs
+    ? documentSnapshots.docs.map((x) => x.data() as IQuestion.Item)
+    : []
+  const total = (await getCountFromServer(countQuery)).data().count
+
+  return { items, total, lastVisible }
+}
+
+const createQueries = (
+  words: string[],
+  category: string,
+  sort: QuestionSortOptions,
+  snapshot?: QueryDocumentSnapshot<DocumentData, DocumentData>,
+  take: number = 10,
+) => {
+  const collectionRef = collection(firestore, DB_ENDPOINTS.questions)
+  let filters: QueryFilterConstraint[] = []
+  let constraints: QueryNonFilterConstraint[] = []
+
+  if (words?.length > 0) {
+    filters = [...filters, and(where('keywords', 'array-contains-any', words))]
+  }
+
+  if (category) {
+    filters = [...filters, where('questionCategory._id', '==', category)]
+  }
+
+  if (sort) {
+    const sortConstraint = getSort(sort)
+
+    if (sortConstraint) {
+      constraints = [...constraints, sortConstraint]
+    }
+  }
+
+  const countQuery = query(collectionRef, and(...filters), ...constraints)
+
+  if (snapshot) {
+    constraints = [...constraints, startAfter(snapshot)]
+  }
+
+  const itemsQuery = query(
+    collectionRef,
+    and(...filters),
+    ...constraints,
+    limit(take),
+  )
+
+  return { countQuery, itemsQuery }
+}
+
+const getQuestionCategories = async () => {
+  const collectionRef = collection(firestore, DB_ENDPOINTS.questionCategories)
+
+  return (await getDocs(query(collectionRef))).docs.map(
+    (x) => x.data() as ICategory,
+  )
+}
+
+const getSort = (sort: QuestionSortOptions) => {
+  switch (sort) {
+    case QuestionSortOptions.Comments:
+      return orderBy('commentCount', 'desc')
+    case QuestionSortOptions.LeastComments:
+      return orderBy('commentCount', 'asc')
+    case QuestionSortOptions.Newest:
+      return orderBy('_created', 'desc')
+    case QuestionSortOptions.LatestComments:
+      return orderBy('latestCommentDate', 'desc')
+    case QuestionSortOptions.LatestUpdated:
+      return orderBy('_modified', 'desc')
+  }
+}
+
+export const questionService = {
+  search,
+  getQuestionCategories,
+}
+
+export const exportedForTesting = {
+  createQueries,
+}

src/pages/common/Category/CategoriesSelectV2.tsx

@@ -0,0 +1,40 @@
+import { Select } from 'oa-components'
+
+import { FieldContainer } from '../../../common/Form/FieldContainer'
+
+export type SelectValue = { label: string; value: string }
+
+export type CategoriesSelectProps = {
+  value: SelectValue | null
+  placeholder: string
+  isForm: boolean
+  categories: SelectValue[]
+  onChange: (value: string) => void
+}
+
+export const CategoriesSelectV2 = ({
+  value,
+  placeholder,
+  isForm,
+  categories,
+  onChange,
+}: CategoriesSelectProps) => {
+  const handleChange = (changedValue) => {
+    onChange(changedValue?.value ?? null)
+  }
+
+  return (
+    <FieldContainer
+      data-cy={categories ? 'category-select' : 'category-select-empty'}
+    >
+      <Select
+        variant={isForm ? 'form' : undefined}
+        options={categories}
+        placeholder={placeholder}
+        value={value}
+        onChange={handleChange}
+        isClearable={true}
+      />
+    </FieldContainer>
+  )
+}

src/stores/Question/question.store.tsx

@@ -8,6 +8,7 @@ import {
   isAllowedToEditContent,
   randomID,
 } from 'src/utils/helpers'
+import { getKeywords } from 'src/utils/searchHelper'
 
 import {
   FilterSorterDecorator,
@@ -175,12 +176,14 @@ export class QuestionStore extends ModuleStore {
 
     const user = this.activeUser as IUser
     const creatorCountry = this.getCreatorCountry(user, values)
+    const keywords = getKeywords(values.title + ' ' + values.description)
 
     await dbRef.set({
       ...(values as any),
       creatorCountry,
       _createdBy: values._createdBy ?? this.activeUser?.userName,
       slug,
+      keywords: keywords,
     })
     logger.debug(`upsertQuestion.set`, { dbRef })
 

src/stores/common/FilterSorterDecorator/FilterSorterDecorator.ts

@@ -39,6 +39,10 @@ export enum ItemSortingOption {
   LatestComments = 'LatestComments',
   Updates = 'MostUpdates',
   TotalDownloads = 'TotalDownloads',
+  MostRelevant = 'MostRelevant',
+  /**
+   * @deprecated This won't be supported with direct firebase queries
+   */
   Random = 'Random',
   SearchResults = 'SearchResults',
 }

src/utils/firebase.ts

@@ -2,6 +2,7 @@ import 'firebase/compat/auth'
 import 'firebase/compat/storage'
 import 'firebase/compat/functions'
 import 'firebase/compat/database'
+import 'firebase/compat/firestore'
 
 import { initializeApp } from 'firebase/app'
 import { connectAuthEmulator, getAuth } from 'firebase/auth'
@@ -19,6 +20,7 @@ const rtdb = firebase.database()
 const storage = firebase.storage()
 const auth = getAuth(firebaseApp)
 const functions = firebase.functions()
+const firestore = firebase.firestore()
 
 // use emulators when running on localhost:4000
 if (SITE === 'emulated_site') {
@@ -32,7 +34,7 @@ if (SITE === 'emulated_site') {
   functions.useEmulator('localhost', 4002)
 }
 
-export { rtdb, storage, auth, functions }
+export { rtdb, storage, auth, functions, firestore }
 
 export const EmailAuthProvider = firebase.auth.EmailAuthProvider
 

src/utils/searchHelper.test.ts

@@ -0,0 +1,29 @@
+import '@testing-library/jest-dom'
+
+import { getKeywords } from './searchHelper'
+
+describe('searchHelper', () => {
+  it('should return all words of a string', () => {
+    // act
+    const words = getKeywords('test1 test2 test3')
+
+    // assert
+    expect(words).toEqual(['test1', 'test2', 'test3'])
+  })
+
+  it('should not return duplicate words', () => {
+    // act
+    const words = getKeywords('test1 test1')
+
+    // assert
+    expect(words).toEqual(['test1'])
+  })
+
+  it('should filter stopwords', () => {
+    // act
+    const words = getKeywords('i am test1 and themselves')
+
+    // assert
+    expect(words).toEqual(['test1'])
+  })
+})

src/utils/searchHelper.ts

@@ -0,0 +1,7 @@
+import { stopwords } from './stopwords'
+
+export const getKeywords = (text: string) => {
+  const words = text.toLowerCase().split(' ') // lowercase so comparisons are accurate
+  const filteredWords = words.filter((word) => !stopwords.has(word)) // filter stopwords
+  return Array.from(new Set(filteredWords)) // avoid duplicates
+}

src/utils/stopwords.ts

@@ -0,0 +1,132 @@
+// NLTK's list of english stopwords
+// https://gist.github.com/sebleier/554280
+
+export const stopwords = new Set([
+  'i',
+  'me',
+  'my',
+  'myself',
+  'we',
+  'our',
+  'ours',
+  'ourselves',
+  'you',
+  'your',
+  'yours',
+  'yourself',
+  'yourselves',
+  'he',
+  'him',
+  'his',
+  'himself',
+  'she',
+  'her',
+  'hers',
+  'herself',
+  'it',
+  'its',
+  'itself',
+  'they',
+  'them',
+  'their',
+  'theirs',
+  'themselves',
+  'what',
+  'which',
+  'who',
+  'whom',
+  'this',
+  'that',
+  'these',
+  'those',
+  'am',
+  'is',
+  'are',
+  'was',
+  'were',
+  'be',
+  'been',
+  'being',
+  'have',
+  'has',
+  'had',
+  'having',
+  'do',
+  'does',
+  'did',
+  'doing',
+  'a',
+  'an',
+  'the',
+  'and',
+  'but',
+  'if',
+  'or',
+  'because',
+  'as',
+  'until',
+  'while',
+  'of',
+  'at',
+  'by',
+  'for',
+  'with',
+  'about',
+  'against',
+  'between',
+  'into',
+  'through',
+  'during',
+  'before',
+  'after',
+  'above',
+  'below',
+  'to',
+  'from',
+  'up',
+  'down',
+  'in',
+  'out',
+  'on',
+  'off',
+  'over',
+  'under',
+  'again',
+  'further',
+  'then',
+  'once',
+  'here',
+  'there',
+  'when',
+  'where',
+  'why',
+  'how',
+  'all',
+  'any',
+  'both',
+  'each',
+  'few',
+  'more',
+  'most',
+  'other',
+  'some',
+  'such',
+  'no',
+  'nor',
+  'not',
+  'only',
+  'own',
+  'same',
+  'so',
+  'than',
+  'too',
+  'very',
+  's',
+  't',
+  'can',
+  'will',
+  'just',
+  'don',
+  'should',
+  'now',
+])

yarn.lock

@@ -27668,6 +27668,7 @@ __metadata:
     stream-browserify: ^3.0.0
     terser: 3.14.1
     theme-ui: ^0.15.7
+    ts-jest: ^29.1.2
     ts-loader: ^7.0.5
     ts-node: ^10.4.0
     tslog: ^4.9.2
@@ -34262,6 +34263,39 @@ __metadata:
   languageName: node
   linkType: hard
 
+"ts-jest@npm:^29.1.2":
+  version: 29.1.2
+  resolution: "ts-jest@npm:29.1.2"
+  dependencies:
+    bs-logger: 0.x
+    fast-json-stable-stringify: 2.x
+    jest-util: ^29.0.0
+    json5: ^2.2.3
+    lodash.memoize: 4.x
+    make-error: 1.x
+    semver: ^7.5.3
+    yargs-parser: ^21.0.1
+  peerDependencies:
+    "@babel/core": ">=7.0.0-beta.0 <8"
+    "@jest/types": ^29.0.0
+    babel-jest: ^29.0.0
+    jest: ^29.0.0
+    typescript: ">=4.3 <6"
+  peerDependenciesMeta:
+    "@babel/core":
+      optional: true
+    "@jest/types":
+      optional: true
+    babel-jest:
+      optional: true
+    esbuild:
+      optional: true
+  bin:
+    ts-jest: cli.js
+  checksum: a0ce0affc1b716c78c9ab55837829c42cb04b753d174a5c796bb1ddf9f0379fc20647b76fbe30edb30d9b23181908138d6b4c51ef2ae5e187b66635c295cefd5
+  languageName: node
+  linkType: hard
+
 "ts-loader@npm:^7.0.5":
   version: 7.0.5
   resolution: "ts-loader@npm:7.0.5"