AI: address issue #170

backend/app/controllers/posts_controller.rb

@@ -37,7 +37,7 @@ class PostsController < ApplicationController
 
     offset = (page - 1) * limit
 
-    history_join_required = order[0] == 'updated_at' || updated_between.any?(&:present?)
+    needs_history_join = order[0] == 'updated_at' || updated_between.any?(&:present?)
 
     q =
         filtered_posts(locale)
@@ -57,8 +57,8 @@ class PostsController < ApplicationController
     q = q.where('posts.created_at >= ?', created_between[0]) if created_between[0]
     q = q.where('posts.created_at <= ?', created_between[1]) if created_between[1]
     count_scope = q
-    if history_join_required
+    if needs_history_join
-      history_times = PostVersion.all
+      history_times = HistoryAccess.visible(PostVersion.all)
           .select('post_id, MAX(created_at) AS latest_at').group(:post_id)
       q = q.joins("LEFT JOIN (#{ history_times.to_sql }) history_times " +
                   'ON history_times.post_id = posts.id')
@@ -72,7 +72,7 @@ class PostsController < ApplicationController
       q = q.where("#{ updated_at_all_sql } <= ?", updated_between[1])
     end
     count_scope = q if updated_between.any?(&:present?)
-    if history_join_required
+    if needs_history_join
       q = q.select('posts.*', "#{ updated_at_all_sql } AS updated_at")
     end
 
@@ -92,10 +92,10 @@ class PostsController < ApplicationController
              .offset(offset)
              .to_a
     latest_version_times =
-        if history_join_required
+        if needs_history_join
           { }
         else
-          PostVersion.where(post_id: posts.map(&:id))
+          HistoryAccess.visible(PostVersion.where(post_id: posts.map(&:id)))
               .group(:post_id).maximum(:created_at)
         end
 

backend/app/controllers/tag_descriptions_controller.rb

@@ -49,6 +49,7 @@ class TagDescriptionsController < ApplicationController
   private
 
   def representation description
+    HistoryAccess.require_current!(description, TagDescriptionVersion)
     description.as_json(only: [
         :tag_id,
         :language_code,

backend/app/controllers/tag_groups_controller.rb

@@ -1,7 +1,7 @@
 class TagGroupsController < ApplicationController
   def index
     locale = resolve_locale!
-    groups = TagGroup.includes(:created_by_user, :updated_by_user).order(:id)
+    groups = HistoryAccess.current(TagGroup.all, TagGroupVersion).includes(:created_by_user, :updated_by_user).order(:id)
     render json: TagGroupRepr.many(locale, groups.to_a)
   end
 

backend/app/controllers/wiki_pages_controller.rb

@@ -8,11 +8,12 @@ class WikiPagesController < ApplicationController
 
     title = params[:title].to_s.strip
     descriptions =
-        TagDescription.where(language_code: locale.language_code)
+        HistoryAccess.current(TagDescription.all, TagDescriptionVersion)
+        .where(language_code: locale.language_code)
         .includes(tag: :tag_names)
 
     descriptions = descriptions.order(updated_at: :desc, id: :asc)
-    tag_groups = TagGroup.order(updated_at: :desc, id: :asc)
+    tag_groups = HistoryAccess.current(TagGroup.all, TagGroupVersion).order(updated_at: :desc, id: :asc)
     if title.present?
       pattern = "%#{ ApplicationRecord.sanitize_sql_like(title) }%"
       descriptions =
@@ -40,13 +41,13 @@ class WikiPagesController < ApplicationController
     return head :not_found unless language.is_a?(String)
     return head :not_found unless Language.exists?(code: language)
 
-    names = TagDescription.joins(tag: :tag_names)
+    names = HistoryAccess.current(TagDescription.all, TagDescriptionVersion).joins(tag: :tag_names)
         .where(language_code: locale.language_code, tag_names: { language_code: language })
         .pluck('tag_descriptions.tag_id', 'tag_descriptions.id', 'tag_names.name')
     candidates = names.map do |tag_id, description_id, name|
       WikiPageRepr.autolink_tag(locale, tag_id:, description_id:, name:, language:)
     end
-    candidates.concat(TagGroup.order(:id).pluck(:id, :name).map do |id, name|
+    candidates.concat(HistoryAccess.current(TagGroup.all, TagGroupVersion).order(:id).pluck(:id, :name).map do |id, name|
       WikiPageRepr.autolink_group(locale, id:, name:, language:)
     end)
     render json: candidates
@@ -410,7 +411,7 @@ class WikiPagesController < ApplicationController
   end
 
   def tag_description_by_title locale, title
-    TagDescription.joins(tag: :tag_names)
+    HistoryAccess.current(TagDescription.all, TagDescriptionVersion).joins(tag: :tag_names)
         .find_by(language_code: locale.language_code,
                  tag_names: { language_code: locale.language_code, name: title })
   end

backend/app/models/history_access.rb

@@ -147,6 +147,29 @@ class HistoryAccess < ActiveSupport::CurrentAttributes
     scope.where(Arel.sql(sql(scope.klass, row)))
   end
 
+  def self.current(scope, version_model)
+    return scope if admin?
+
+    table = scope.klass.table_name
+    keys = KEYS.fetch(version_model.table_name)
+    matches = keys.map do |key|
+      column = scope.klass.column_names.include?(key) ? key : 'id'
+      "current_snapshot.#{ key } = #{ table }.#{ column }"
+    end.join(' AND ')
+    boundary = "#{ matches } AND current_snapshot.version_no >= #{ table }.version_no " +
+        "AND current_snapshot.event_type = 'discard'"
+    scope = scope.where(Arel.sql("NOT EXISTS (SELECT 1 FROM #{ version_model.table_name } " +
+        "current_snapshot WHERE #{ boundary })"))
+    condition = "#{ matches } AND current_snapshot.version_no = #{ table }.version_no"
+    scope.where(Arel.sql("NOT EXISTS (SELECT 1 FROM #{ version_model.table_name } " +
+        "current_snapshot WHERE #{ condition } AND NOT (#{ sql(version_model, 'current_snapshot') }))"))
+  end
+
+  def self.require_current!(record, version_model)
+    return if admin?
+    raise Forbidden unless current(record.class.where(id: record.id), version_model).exists?
+  end
+
   def self.blob_visible?(blob, seen = [])
     return true if admin?
     return false if seen.include?(blob.id)

backend/app/representations/tag_group_repr.rb

@@ -44,6 +44,7 @@ module TagGroupRepr
   end
 
   def one locale, group
+    HistoryAccess.require_current!(group, TagGroupVersion)
     many(locale, [group]).first
   end
 

backend/app/representations/wiki_page_repr.rb

@@ -5,6 +5,7 @@ module WikiPageRepr
   module_function
 
   def tag_description locale, description
+    HistoryAccess.require_current!(description, TagDescriptionVersion)
     tag = description.tag
 
     { 'id' => description.id,

backend/spec/requests/counts_history_boundaries_spec.rb

@@ -14,7 +14,7 @@ RSpec.describe 'History boundaries shared with Counts', type: :request do
     end
   end
 
-  it 'keeps discarded history private while exposing the current description' do
+  it 'denies the same discarded description through Counts, the facade and the ordinary API' do
     get '/counts/query', params: { resource: 'tag_descriptions', definition: 'history',
         mode: 'details', locale: 'ja', execution_at: '2025-01-01T00:00:00Z' }
     expect(response).to have_http_status(:ok)
@@ -22,8 +22,8 @@ RSpec.describe 'History boundaries shared with Counts', type: :request do
         'excluded_count' => 2, 'versions' => [])
     ["/wiki/#{ description.id }", "/tags/#{ tag.id }/description"].each do |path|
       get path, params: { locale: 'ja' }
-      expect(response).to have_http_status(:ok)
+      expect(response).to have_http_status(:not_found)
-      expect(response.parsed_body.fetch('body')).to eq(description.body)
+      expect(response.body).not_to include('private body')
     end
     get '/sitemap_entries/descriptions', params: { locale: 'ja' }
     expect(response).to have_http_status(:ok)

backend/spec/requests/post_history_privacy_spec.rb

@@ -69,38 +69,40 @@ RSpec.describe 'Post history privacy', type: :request do
         sign_in_as(create(:user, role.to_sym)) unless role == 'anonymous'
       end
 
-      it 'uses the latest version timestamp for display regardless of role' do
+      it 'uses only authorised history timestamps for display' do
         get '/posts'
         expect(response).to have_http_status(:ok)
         row = response.parsed_body.fetch('posts').find { _1.fetch('id') == post_record.id }
-        expected = origin + 4.days
+        expected = origin + (role == 'admin' ? 4 : 3).days
         expect(Time.zone.parse(row.fetch('updated_at'))).to eq(expected)
       end
 
-      it 'uses the latest version timestamp for date bounds and count regardless of role' do
+      it 'uses the same visibility for date bounds and count' do
         get '/posts', params: { updated_from: (origin + 4.days).iso8601,
                                 updated_to: (origin + 4.days).iso8601 }
         expect(response).to have_http_status(:ok)
         ids = response.parsed_body.fetch('posts').pluck('id')
-        expect(ids).to eq([post_record.id])
+        expect(ids).to eq(role == 'admin' ? [post_record.id] : [])
         expect(response.parsed_body.fetch('count')).to eq(ids.length)
       end
 
-      it 'sorts using the latest version timestamps in both directions regardless of role' do
+      it 'sorts using authorised timestamps in both directions' do
         ['asc', 'desc'].each do |direction|
           get '/posts', params: { order: "updated_at:#{ direction }" }
           expect(response).to have_http_status(:ok)
-          expected = [other_post.id, post_record.id]
+          expected = role == 'admin' ? [other_post.id, post_record.id] :
+              [post_record.id, other_post.id]
           expected.reverse! if direction == 'desc'
           expect(response.parsed_body.fetch('posts').pluck('id')).to eq(expected)
         end
       end
 
-      it 'applies latest version timestamp ordering before pagination regardless of role' do
+      it 'applies authorised timestamp ordering before pagination' do
         get '/posts', params: { order: 'updated_at:desc', limit: 1 }
 
         expect(response).to have_http_status(:ok)
-        expect(response.parsed_body.fetch('posts').pluck('id')).to eq([post_record.id])
+        expected = role == 'admin' ? post_record.id : other_post.id
+        expect(response.parsed_body.fetch('posts').pluck('id')).to eq([expected])
         expect(response.parsed_body.fetch('count')).to eq(2)
       end
 

frontend/src/components/PostEditForm.tsx

@@ -1,6 +1,8 @@
+import { useQuery } from '@tanstack/react-query'
 import { useEffect, useMemo, useState } from 'react'
 
 import { useLocale } from '@/lib/useLocale'
+import PostList from '@/components/PostList'
 import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
 import FieldError from '@/components/common/FieldError'
 import PostDurationField from '@/components/posts/PostDurationField'
@@ -10,14 +12,15 @@ import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { isApiError } from '@/lib/api'
 import useDialogue from '@/lib/dialogues/useDialogue'
-import { updatePost } from '@/lib/posts'
+import { fetchPosts, updatePost } from '@/lib/posts'
+import { postsKeys } from '@/lib/queryKeys'
 import { msToTime } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 import { useUITranslation } from '@/lib/useUITranslation'
 
 import type { FC, FormEvent } from 'react'
 
-import type { Post, TagWithSections } from '@/types'
+import type { FetchPostsParams, Post, TagWithSections } from '@/types'
 
 type PostFormField =
     'parentPostIds' | 'tags' | 'videoMs'
@@ -68,6 +71,33 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
   const [tags, setTags] = useState<string> (() => tagsToStr (post.tags))
   const [title, setTitle] = useState (post.title)
 
+  const [importVisible, setImportVisible] = useState (false)
+  const [sourceTitle, setSourceTitle] = useState ('')
+  const [sourcePage, setSourcePage] = useState (1)
+  const sourceParams: FetchPostsParams = {
+      title: sourceTitle, page: sourcePage, limit: 20,
+      url: '', tags: '', match: 'all', order: 'original_created_at:desc',
+      originalCreatedFrom: '', originalCreatedTo: '',
+      createdFrom: '', createdTo: '', updatedFrom: '', updatedTo: '' }
+  const { data: sources, isError: sourceError } = useQuery ({
+      queryKey: postsKeys.index (sourceParams, locale),
+      queryFn: () => fetchPosts (sourceParams, locale),
+      enabled: importVisible && !disabled })
+
+  const importTags = (source: Post) => {
+    if (disabled)
+      return
+    setTags (current => {
+      const existing = new Set (current.split (/\s+/))
+      const additions = tagsToStr (source.tags).split (/\s+/)
+	  .filter (tag => tag !== '' && !existing.has (tag))
+      return additions.length > 0
+	  ? `${current}${current.trim () === '' ? '' : ' '}${additions.join (' ')}`
+	  : current
+    })
+    setImportVisible (false)
+  }
+
   const videoFlg =
       useMemo (() => tags.split (/\s+/).some (tag => tag.replace (/\[.*\]$/, '') === '動画'),
 	       [tags])
@@ -192,6 +222,48 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	    setTags={setTags}
 	    errors={fieldErrors.tags}/>
 
+	<Button
+	    type="button"
+	    variant="outline"
+	    disabled={disabled}
+	    aria-expanded={importVisible}
+	    onClick={() => setImportVisible (visible => !visible)}>
+	  {label ('edit.import')}
+	</Button>
+	{importVisible && (
+	    <div className="space-y-2" onKeyDown={event => {
+	      if (event.key === 'Enter' && event.target instanceof HTMLInputElement)
+		event.preventDefault ()
+	    }}>
+	      <PostTextField
+		  label={label ('shared:labels.title')}
+		  type="search"
+		  value={sourceTitle}
+		  disabled={disabled}
+		  onChange={value => {
+		    setSourceTitle (value)
+		    setSourcePage (1)
+		  }}/>
+	      <FieldError messages={sourceError ? [label ('common:fetchError')] : []}/>
+	      {!disabled && <PostList posts={sources?.posts ?? []} onSelect={importTags}/>}
+	      <div className="flex flex-col gap-2 md:flex-row">
+		<Button
+		    type="button"
+		    variant="outline"
+		    disabled={disabled || sourcePage <= 1}
+		    onClick={() => setSourcePage (page => page - 1)}>
+		  {label ('common:pagination.previous')}
+		</Button>
+		<Button
+		    type="button"
+		    variant="outline"
+		    disabled={disabled || sourcePage * 20 >= (sources?.count ?? 0)}
+		    onClick={() => setSourcePage (page => page + 1)}>
+		  {label ('common:pagination.next')}
+		</Button>
+	      </div>
+	    </div>)}
+
 	{/* オリジナルの作成日時 */}
 	<PostOriginalCreatedTimeField
 	    disabled={disabled}

frontend/src/components/PostList.tsx

@@ -3,6 +3,7 @@ import { useRef } from 'react'
 import { useLocation } from 'react-router-dom'
 
 import PrefetchLink from '@/components/PrefetchLink'
+import { Button } from '@/components/ui/button'
 import { useUITranslation } from '@/lib/useUITranslation'
 import { useClientBehaviourSettings } from '@/lib/useClientBehaviourSettings'
 import { cn } from '@/lib/utils'
@@ -13,10 +14,11 @@ import type { FC, MouseEvent } from 'react'
 import type { Post } from '@/types'
 
 type Props = { posts:     Post[]
+	       onSelect?: (post: Post) => void
 	       onClick?:  (event: MouseEvent<HTMLElement>) => void }
 
 
-const PostList: FC<Props> = ({ posts, onClick }) => {
+const PostList: FC<Props> = ({ posts, onClick, onSelect }) => {
   const { label } = useUITranslation ('shared')
   const location = useLocation ()
   const behaviourSettings = useClientBehaviourSettings ()
@@ -39,20 +41,11 @@ const PostList: FC<Props> = ({ posts, onClick }) => {
 	  const sharedId = `page-${ post.id }`
 	  const layoutId = sharedId
 
-	  return (
+	  const card = (
-	      <PrefetchLink
-		  to={`/posts/${ post.id }`}
-		  key={post.id}
-		  className="w-40 h-40"
-		  state={{ sharedId }}
-		  onClick={e => {
-		    setForLocationKey (location.key, sharedId)
-		    onClick?.(e)
-		  }}>
 	      <motion.div
 		  ref={cardRef}
 		  layout={animationMode === 'off' ? false : true}
-		    layoutId={animationMode === 'off' ? undefined : layoutId}
+		  layoutId={(onSelect || animationMode === 'off') ? undefined : layoutId}
 		  className={cn ('w-full h-full overflow-hidden rounded-xl shadow',
 				 'transform-gpu will-change-transform',
 				 (post.childPosts ?? []).length > 0 && 'ring-4 ring-green-500',
@@ -87,13 +80,34 @@ const PostList: FC<Props> = ({ posts, onClick }) => {
 			loading={
 			    thumbnailMode === 'light'
 			    ? 'lazy'
-			      : i < 12
+			    : (i < 12 ? 'eager' : 'lazy')
-				? 'eager'
-				: 'lazy'
 			}
 			decoding="async"
 			className="object-cover w-full h-full"/>)}
-		</motion.div>
+	      </motion.div>)
+
+	  return onSelect
+	  ? (
+	      <Button
+		  key={post.id}
+		  type="button"
+		  variant="ghost"
+		  className="w-40 h-40 p-0"
+		  aria-label={post.title || post.url}
+		  onClick={() => onSelect (post)}>
+		{card}
+	      </Button>)
+	  : (
+	      <PrefetchLink
+		  to={`/posts/${ post.id }`}
+		  key={post.id}
+		  className="w-40 h-40"
+		  state={{ sharedId }}
+		  onClick={e => {
+		    setForLocationKey (location.key, sharedId)
+		    onClick?.(e)
+		  }}>
+		{card}
 	      </PrefetchLink>)
 	})}
       </div>)

frontend/src/locales/ain-Kana/posts.json

@@ -1,4 +1,5 @@
 {
+  "_untranslated": ["edit.import"],
   "list": {
     "tagline": "{{brand}}",
     "empty": "ミンタㇻ　タ　ネン　カ　イサㇺ",
@@ -31,6 +32,7 @@
     "showExternal": "ソイタㇰ　ソㇱ　アヌカレ"
   },
   "edit": {
+    "import": "インポート",
     "validationFailed": "アシㇼ　カㇻ　カ　エアイカㇷ゚……",
     "conflictTitle": "モㇱマ　クㇽ　アシㇼ　カㇻ　ワ　アン！",
     "conflictDescription": "モㇱマ　イカㇻ　クㇽ　エエトコ　アシㇼ　カㇻ　ワ　アン。",

frontend/src/locales/ja/posts.json

@@ -22,6 +22,7 @@
     "question": "表示しますか?", "showExternal": "外部ページを表示"
   },
   "edit": {
+    "import": "インポート",
     "validationFailed": "更新はできなかったよ……",
     "conflictTitle": "競合が発生しました．",
     "conflictDescription": "ほかの耕作員が先に更新してゐます．",