#434

backend/app/controllers/application_controller.rb

@@ -27,6 +27,9 @@ class ApplicationController < ActionController::API
   private
 
   def enforce_query_contract!
+    if request.query_parameters.keys.any? { _1 == 'tag_refs' || _1.start_with?('tag_refs.') }
+      return head :bad_request
+    end
     pairs = URI.decode_www_form(request.query_string)
     return head :bad_request if pairs.length > 1000 || pairs.map(&:first).uniq.length != pairs.length
     return head :bad_request if request.query_parameters.values.any? { !_1.is_a?(String) }

backend/app/controllers/posts_controller.rb

@@ -409,52 +409,40 @@ class PostsController < ApplicationController
     target = Locale.find_by(code:, deprecated_at: nil)
     return head :not_found unless target
 
-    literals = params[:tags].to_s.split
-    references = tag_filter_references(literals)
-    names = literals.each_with_index.map do |literal, index|
-      reference = references&.[](index)
-      (reference && reference['negative'] == false) ? literal : literal.sub(/\Anot:/i, '')
-    end
-    internal = references ? {} : TagName.where(
-        language_code: source.language_code, name: names).pluck(:name, :tag_id).to_h
-    canonical = references ? {} : TagName.where(
-        language_code: source.language_code, primary_flg: true,
-        tag_id: internal.values).pluck(:tag_id, :name).to_h
-    external_names = names.map { canonical[internal[_1]] || _1 }
-    external = references ? {} : ExternalTag.where(
-        "CONCAT(platform, ':', name) IN (?)", external_names).pluck(
-        Arel.sql("CONCAT(platform, ':', name)"), :id).to_h
-    ids = references ? references.filter_map { _1['tag_id'] } : internal.values
-    translated = TagName.where(language_code: target.language_code,
+    tokens = params[:tags].to_s.split
+    literals = PostTagSearch.literals(source, tokens.join(' '))
+    source_ids = PostTagSearch.references_for(source, literals)
+    ids = source_ids.values.flat_map(&:first).uniq
+    names = TagName.where(language_code: target.language_code,
         primary_flg: true, tag_id: ids).pluck(:tag_id, :name).to_h
+    filters = literals.map do |literal|
+      internal, = source_ids.fetch(literal[:name])
+      name = internal.empty? ? literal[:name] : names[internal.first]
+      return head :unprocessable_entity unless name && internal.length <= 1
 
-    filters = literals.each_with_index.map do |literal, index|
-      name = names[index]
-      reference = if references
-                    references[index].except('name')
-                  else
-                    matches = {}
-                    matches['tag_id'] = internal[name] if internal[name]
-                    external_id = external[external_names[index]]
-                    matches['external_tag_id'] = external_id if external_id
-                    matches.empty? ? { 'missing' => true } : matches
+      literal[:negative] ? "not:#{ name }" : name
     end
-      name = translated[reference['tag_id']] || name
-      negative = reference.fetch('negative', literal.downcase.start_with?('not:'))
-      prefix = negative ? literal[/\Anot:/i] || 'not:' : ''
-      reference.merge('name' => "#{ prefix }#{ name }", 'negative' => negative)
+    translated = PostTagSearch.literals(target, filters.join(' '))
+    target_ids = PostTagSearch.references_for(target, translated)
+    literals.zip(translated).each do |literal, translation|
+      unless (source_ids.fetch(literal[:name]).map(&:sort) ==
+          target_ids.fetch(translation[:name]).map(&:sort))
+        return head :unprocessable_entity
       end
-    render json: { references: filters }
+    end
+    index = 0
+    filters = tokens.map do |token|
+      next token if token.downcase == 'type:or'
+
+      value = filters[index]
+      index += 1
+      value
+    end
+    render json: { tags: filters.join(' ') }
   end
 
   private
 
-  def tag_filter_references literals
-    PostTagSearch.parse_references(params.to_unsafe_h, literals)
-  rescue ArgumentError, JSON::ParserError, TypeError
-    raise ActionController::BadRequest
-  end
-
   def filtered_posts locale
     tag_names = params[:tags].to_s.split
     match_type = params[:match]
@@ -466,19 +454,17 @@ class PostsController < ApplicationController
   end
 
   def filter_posts_by_tags locale, tag_names, match_type
-    references = tag_filter_references(tag_names)
-    literals = PostTagSearch.literals(locale, tag_names.join(' '), references:)
+    literals = PostTagSearch.literals(locale, tag_names.join(' '))
 
     return Post.all if literals.empty?
 
     if match_type == 'any'
       literals.reduce(Post.none) do |posts, literal|
-        posts.or(tag_literal_relation(locale, literal[:name], negative: literal[:negative],
-                                      reference: literal[:reference]))
+        posts.or(tag_literal_relation(locale, literal[:name], negative: literal[:negative]))
       end
     else
       literals.reduce(Post.all) do |posts, literal|
-        ids = tagged_post_ids_for(locale, literal[:name], reference: literal[:reference])
+        ids = tagged_post_ids_for(locale, literal[:name])
         if literal[:negative]
           posts.where.not(id: ids)
         else
@@ -488,8 +474,8 @@ class PostsController < ApplicationController
     end
   end
 
-  def tag_literal_relation locale, name, negative:, reference: nil
-    ids = tagged_post_ids_for(locale, name, reference:)
+  def tag_literal_relation locale, name, negative:
+    ids = tagged_post_ids_for(locale, name)
     if negative
       Post.where.not(id: ids)
     else
@@ -497,8 +483,8 @@ class PostsController < ApplicationController
     end
   end
 
-  def tagged_post_ids_for locale, name, reference: nil
-    internal, external = PostTagSearch.references(locale, { name:, reference: })
+  def tagged_post_ids_for locale, name
+    internal, external = PostTagSearch.references(locale, { name: })
     Post.where(id: PostTag.where(tag_id: Array(internal)).select(:post_id))
         .or(Post.where(id: PostExternalTag.where(external_tag_id: Array(external))
             .select(:post_id))).select(:id)

backend/app/services/counts_condition.rb

@@ -161,25 +161,6 @@ class CountsCondition
     scope.where(predicate, *binds)
   end
 
-  def tag_name_match(value)
-    source = post_tag_source
-    bound = @population.history ? 'v.created_at' : @connection.quote(point)
-    source += ' LEFT JOIN nico_tag_versions external_snapshot ON external_snapshot.tag_id = ' +
-        scalar('tag_snapshot.item', 'external_tag_id', :integer) +
-        " AND external_snapshot.created_at <= #{ bound } AND " +
-        @population.access_sql(NicoTagVersion, 'external_snapshot') +
-        ' AND NOT EXISTS (SELECT 1 FROM nico_tag_versions newer_external ' +
-        'WHERE newer_external.tag_id = external_snapshot.tag_id ' +
-        "AND newer_external.created_at <= #{ bound } " +
-        'AND newer_external.version_no > external_snapshot.version_no)'
-    document = "JSON_MERGE_PRESERVE(JSON_ARRAY(#{ scalar('tag_snapshot.item', 'name') }, " +
-        "referenced_tag.name, CONCAT('nico:', external_snapshot.name)), " +
-        "COALESCE(JSON_EXTRACT(referenced_tag.names, '$**.name'), JSON_ARRAY()))"
-    source += ' JOIN ' + json_table(document, '$[*]', 'search_name')
-    @definition.model.sanitize_sql_array([
-        "EXISTS (SELECT 1 FROM #{ source } WHERE JSON_UNQUOTE(search_name.item) = ?)", value])
-  end
-
   private
 
   def set_condition(scope, entry, field)

backend/app/services/counts_population.rb

@@ -210,23 +210,19 @@ class CountsPopulation
 
     raw = params['tags']
     tokens = raw.split.reject { _1.downcase == 'type:or' }
-    refs = PostTagSearch.parse_references(params, tokens, partial: true)
     locale = Locale.find_by(code: params.fetch('locale', 'ja'))
     raise ArgumentError unless locale
 
-    literals = PostTagSearch.literals(locale, tokens.join(' '), references: refs)
+    literals = PostTagSearch.literals(locale, tokens.join(' '))
+    identities = PostTagSearch.references_for(locale, literals)
     predicates = literals.map do |literal|
-      reference = literal[:reference]
-      expression = if reference
-                     parts = { 'internal' => reference['tag_id'],
-                         'external' => reference['external_tag_id'] }.filter_map do |kind, id|
-                       snapshot_membership("#{ kind }:#{ id }") if id
-                     end
-                     parts.empty? ? 'FALSE' : "(#{ parts.join(' OR ') })"
-                   else
-                     @condition ||= CountsCondition.new(self)
-                     @condition.tag_name_match(literal[:name])
+      # Resolve current names/aliases exactly as normal post search does. Only
+      # membership comes from history; snapshot names never identify a tag.
+      internal, external = identities.fetch(literal[:name])
+      parts = { 'internal' => internal, 'external' => external }.flat_map do |kind, ids|
+        Array(ids).map { |id| snapshot_membership("#{ kind }:#{ id }") }
       end
+      expression = parts.empty? ? 'FALSE' : "(#{ parts.join(' OR ') })"
       literal[:negative] ? "NOT #{ expression }" : expression
     end
     return if predicates.empty?

backend/app/services/counts_table_query.rb

@@ -4,7 +4,7 @@ class CountsTableQuery
   class TooManyColumns < ArgumentError; end
 
   KEYS = ['resource', 'definition', 'mode', 'at', 'execution_at', 'from', 'through',
-          'timezone', 'rows', 'cols', 'conditions', 'drill', 'tags', 'tag_refs', 'match',
+          'timezone', 'rows', 'cols', 'conditions', 'drill', 'tags', 'match',
           'tag', 'kind', 'resource_id', 'user_id', 'page', 'limit', 'sort', 'locale',
           'measures', 'column_order', 'condition_values', 'name_scope'].freeze
   attr_reader :population, :axes, :page, :limit, :mode
@@ -224,7 +224,7 @@ class CountsTableQuery
 
     fields = QueryState.records(@params, 'conditions') + QueryState.records(@params, 'drill')
     private_fields = fields.any? { !CountsAxes::PUBLIC_FIELDS.include?(_1['field']) }
-    keys = ['tags', 'tag_refs', 'tag', 'kind', 'resource_id', 'user_id']
+    keys = ['tags', 'tag', 'kind', 'resource_id', 'user_id']
     private_parameters = keys.any? do |key|
       @params.any? { |name, value| (name == key || name.start_with?("#{ key }.")) && value != '' }
     end

backend/app/services/post_tag_search.rb

@@ -1,52 +1,30 @@
 # Shared literal parsing and reference resolution for current and snapshot post search.
 class PostTagSearch
-  def self.parse_references(raw, literals, partial: false)
-    return nil unless raw.key?('tag_refs')
-
-    references = QueryState.records(raw, 'tag_refs')
-    valid = references.is_a?(Array) && references.all? do |reference|
-      next false unless reference.is_a?(Hash) && reference['name'].is_a?(String)
-
-      ids = [reference['tag_id'], reference['external_tag_id']].compact
-      ((ids.any? || reference['missing'] == true) &&
-          ids.all? { _1.is_a?(Integer) && _1.positive? } &&
-          (!reference.key?('missing') || (reference['missing'] == true && ids.empty?)) &&
-          (!reference.key?('negative') || [true, false].include?(reference['negative'])))
-    end
-    raise ArgumentError unless valid
-
-    if partial
-      remaining = references.dup
-      result = literals.map do |literal|
-        index = remaining.index { _1['name'] == literal }
-        index ? remaining.delete_at(index) : nil
-      end
-      raise ArgumentError if remaining.any?
-
-      return result
-    end
-    references.map { _1['name'] } == literals ? references : nil
-  end
-
-  def self.literals(locale, raw, references: nil)
-    raw.split.each_with_index.filter_map do |token, index|
-      next if token.downcase == 'type:or'
-
-      reference = references&.[](index)
-      name = token.sub(/\Anot:/i, '')
-      name = TagName.canonicalise(locale, name).first unless reference || locale.nil?
-      negative = reference&.key?('negative') ? reference['negative'] :
-          token.downcase.start_with?('not:')
-      { name:, negative:, reference: }
+  def self.literals(locale, raw)
+    tokens = raw.split.reject { _1.downcase == 'type:or' }
+    names = tokens.map { _1.sub(/\Anot:/i, '') }
+    registered = TagName.where(language_code: locale.language_code, name: names)
+        .pluck(:name, :tag_id).to_h
+    primary = TagName.where(language_code: locale.language_code,
+        tag_id: registered.values, primary_flg: true).pluck(:tag_id, :name).to_h
+    tokens.zip(names).map do |token, name|
+      { name: primary[registered[name]] || name,
+        negative: token.downcase.start_with?('not:') }
     end
   end
 
   def self.references(locale, literal)
-    reference = literal[:reference]
-    return [reference['tag_id'], reference['external_tag_id']] if reference
+    references_for(locale, [literal]).fetch(literal[:name])
+  end
 
-    [TagName.where(language_code: locale.language_code, name: literal[:name])
-         .distinct.pluck(:tag_id),
-     ExternalTag.where("CONCAT(platform, ':', name) = ?", literal[:name]).pluck(:id)]
+  def self.references_for(locale, literals)
+    names = literals.map { _1[:name] }.uniq
+    internal = TagName.where(language_code: locale.language_code, name: names)
+        .pluck(:name, :tag_id).group_by(&:first)
+    external = names.empty? ? {} : ExternalTag.where(
+        "CONCAT(platform, ':', name) IN (?)", names)
+        .pluck(Arel.sql("CONCAT(platform, ':', name)"), :id).group_by(&:first)
+    names.to_h { |name| [name, [internal.fetch(name, []).map(&:last).uniq,
+                              external.fetch(name, []).map(&:last).uniq]] }
   end
 end

backend/app/services/query_state.rb

@@ -4,7 +4,6 @@ class QueryState
       'conditions' => ['field', 'operator', 'value', 'end', 'blank', 'input', 'values', 'grain', 'value_type'],
       'condition_values' => ['condition', 'value', 'value_type'],
       'drill' => ['field', 'grain', 'value', 'value_type'],
-      'tag_refs' => ['name', 'tag_id', 'external_tag_id', 'negative', 'missing'],
       'column_order' => ['value', 'value_type'],
       'measures' => ['key', 'axis', 'value', 'value_type'] }.freeze
 
@@ -41,11 +40,11 @@ class QueryState
 
       _root, index, field = name.split('.')
       record = records[index.to_i] ||= {}
-      if ['blank', 'negative', 'missing', 'values'].include?(field)
+      if ['blank', 'values'].include?(field)
         raise ArgumentError unless ['0', '1'].include?(value)
 
         value = value == '1'
-      elsif ['tag_id', 'external_tag_id', 'axis', 'condition'].include?(field)
+      elsif ['axis', 'condition'].include?(field)
         raise ArgumentError unless value.match?(/\A[0-9]{1,18}\z/)
 
         value = value.to_i

backend/spec/requests/counts_table_spec.rb

@@ -120,17 +120,61 @@ RSpec.describe 'Counts table API', type: :request do
     expect(versions(query(empty.except('conditions.0.values')))).to eq([1, 2, 3])
   end
 
-  it 'canonicalises unreferenced tags while preserving partial stable references' do
-    reference = { tag_refs: '', 'tag_refs.0.name' => 'alpha',
-                  'tag_refs.0.tag_id' => tag.id.to_s }
+  it 'resolves current tag names for AND, OR and negative searches' do
     expect(versions(query(tags: 'alpha'))).to eq([1, 2])
-    expect(versions(query(reference.merge(tags: 'alpha nico:beta')))).to eq([1])
-    expect(versions(query(reference.merge(tags: 'nico:beta alpha')))).to eq([1])
-    expect(versions(query(reference.merge(tags: 'alpha not:nico:beta')))).to eq([2])
-    expect(versions(query(reference.merge(tags: 'alpha nico:beta', match: 'any')))).to eq([1, 2])
+    expect(versions(query(tags: 'alpha nico:beta'))).to eq([1])
+    expect(versions(query(tags: 'nico:beta alpha'))).to eq([1])
+    expect(versions(query(tags: 'alpha not:nico:beta'))).to eq([2])
+    expect(versions(query(tags: 'alpha nico:beta', match: 'any'))).to eq([1, 2])
     expect(versions(query(tags: 'not:alpha'))).to eq([3])
-    get '/counts/query', params: base.merge(reference).merge(tags: 'different')
-    expect(response).to have_http_status(:bad_request)
+  end
+
+  context 'when current tag names differ from recorded snapshot names' do
+    before do
+      tag.tag_names.find_by!(language_code: 'ja', primary_flg: true)
+          .update!(name: 'renamed-alpha')
+      create(:tag_name, :alias, tag:, name: 'alpha-alias')
+      TagVersion.create!(tag:, version_no: 2, event_type: 'update', name: 'renamed-alpha',
+          category: 'general', aliases: 'alpha-alias', parent_tag_ids: '',
+          names: { ja: { name: 'renamed-alpha', script_code: 'Jpan', auto_generated: false,
+                         aliases: [{ name: 'alpha-alias', script_code: 'Jpan' }] } },
+          created_at: Time.utc(2024, 2, 1))
+      PostVersion.create!(post: record, version_no: 4, event_type: 'update',
+          url: record.url, title: 'after rename', tags: '', parent_post_ids: '',
+          tags_json: [{ tag_id: tag.id, version_no: 2, name: 'renamed-alpha',
+                        category: 'general', sections: [] }],
+          created_by_user: actor, created_at: Time.utc(2024, 2, 2))
+    end
+
+    it 'resolves current names and aliases to stable IDs in both definitions' do
+      { 'history' => [1, 2, 4], 'latest' => [4] }.each do |definition, expected|
+        ['renamed-alpha', 'alpha-alias'].each do |name|
+          expect(versions(query(tags: name, definition:))).to eq(expected)
+        end
+      end
+      result = query(tags: 'renamed-alpha')
+      expect(result['versions'].first['tags'].first['name']).to eq('alpha')
+      expect(versions(query(tags: 'renamed-alpha', definition: 'latest',
+          at: '2024-01-31T16:00:00Z', current: '0'))).to eq([2])
+      expect(versions(query(tags: 'not:alpha-alias'))).to eq([3])
+      expect(versions(query(tags: 'renamed-alpha nico:beta'))).to eq([1])
+      expect(versions(query(tags: 'renamed-alpha nico:beta', match: 'any'))).to eq([1, 2, 4])
+    end
+
+    it 'does not match a historical name reassigned to another tag ID' do
+      create(:tag, primary_name: 'alpha')
+      expect(versions(query(tags: 'alpha'))).to eq([])
+      expect(versions(query(tags: 'unregistered-name'))).to eq([])
+      expect(versions(query(tags: 'not:unregistered-name'))).to eq([1, 2, 3, 4])
+      expect(versions(query(tags: 'renamed-alpha'))).to eq([1, 2, 4])
+    end
+
+    it 'resolves external names from current registrations too' do
+      external.update!(name: 'renamed-beta')
+      expect(versions(query(tags: 'nico:renamed-beta'))).to eq([1])
+      expect(versions(query(tags: 'nico:beta'))).to eq([])
+      expect(versions(query(tags: 'not:nico:renamed-beta'))).to eq([2, 3, 4])
+    end
   end
 
   it 'rejects malformed structured conditions and axes without accepting arbitrary SQL' do
@@ -149,7 +193,8 @@ RSpec.describe 'Counts table API', type: :request do
   end
 
   it 'rejects duplicate URL keys and JSON query payloads at the HTTP boundary' do
-    ['resource=posts&limit=20&limit=50', 'resource=posts&headers=%5B%22Id.%22%5D',
+    ['resource=posts&tag_refs=', 'resource=posts&tag_refs.0.tag_id=1',
+     'resource=posts&limit=20&limit=50', 'resource=posts&headers=%5B%22Id.%22%5D',
      'resource=posts&limit%5B%5D=20'].each do |query_string|
       get "/counts/query?#{ query_string }"
       expect(response).to have_http_status(:bad_request)

backend/spec/requests/post_locale_filter_identity_spec.rb

@@ -11,43 +11,49 @@ RSpec.describe 'Post filter identity across locales', type: :request do
   let!(:other_post) { create(:post) }
 
   before do
-    # Legacy data can predate the current prohibition on internal nico: names.
-    primary_tag_name_for(tag, 'ja').update_columns(name: 'nico:shared')
     primary_tag_name_for(tag, 'ain').update!(name: 'シロシ', auto_generated: false)
     create(:tag_name, :alias, tag:, name: 'union_alias', language_code: 'ja')
     PostTag.create!(post: internal_post, tag:)
     PostExternalTag.create!(post: external_post, external_tag: external)
   end
 
-  ['nico:shared', 'union_alias', 'not:nico:shared'].each do |literal|
+  literals = ['legacy_union_source', 'union_alias', 'not:legacy_union_source', 'nico:shared']
+  literals.each do |literal|
     it "preserves the complete match set for #{ literal }" do
       get '/posts', params: { locale: 'ja', tags: literal }
       expect(response).to have_http_status(:ok)
       original_ids = json.fetch('posts').map { _1.fetch('id') }
-      expected = literal.start_with?('not:') ? [other_post.id] :
-          [internal_post.id, external_post.id]
+      expected = if literal.start_with?('not:')
+                   [external_post.id, other_post.id]
+                 elsif literal == 'nico:shared'
+                   [external_post.id]
+                 else
+                   [internal_post.id]
+                 end
       expect(original_ids).to match_array(expected)
 
       get '/posts/tag_filters', params: {
           locale: 'ja', target_locale: 'ain-Kana', tags: literal }
       expect(response).to have_http_status(:ok)
-      references = json.fetch('references')
-      expect(references.first).to include('tag_id' => tag.id, 'external_tag_id' => external.id)
-
-      reference_params = { tag_refs: '' }
-      references.each_with_index do |reference, index|
-        ['name', 'tag_id', 'external_tag_id', 'negative', 'missing'].each do |field|
-          value = reference[field]
-          next if value.nil? || (field == 'missing' && value == false)
-
-          reference_params["tag_refs.#{ index }.#{ field }"] =
-              [true, false].include?(value) ? (value ? '1' : '0') : value.to_s
-        end
-      end
-      get '/posts', params: { locale: 'ain-Kana',
-          tags: references.map { _1.fetch('name') }.join(' ') }.merge(reference_params)
+      translated = json.fetch('tags')
+      expect(translated).to eq(literal == 'nico:shared' ? literal :
+          (literal.start_with?('not:') ? 'not:シロシ' : 'シロシ'))
+      get '/posts', params: { locale: 'ain-Kana', tags: translated }
       expect(response).to have_http_status(:ok)
       expect(json.fetch('posts').map { _1.fetch('id') }).to match_array(original_ids)
     end
   end
+
+  it 'rejects a locale conversion that cannot preserve a legacy union' do
+    primary_tag_name_for(tag, 'ja').update_columns(name: 'nico:shared')
+    get '/posts/tag_filters', params: {
+        locale: 'ja', target_locale: 'ain-Kana', tags: 'nico:shared' }
+    expect(response).to have_http_status(:unprocessable_entity)
+  end
+
+  it 'rejects removed reference parameters instead of overriding the name' do
+    get '/posts', params: { locale: 'ja', tags: 'legacy_union_source',
+                           tag_refs: '', 'tag_refs.0.tag_id' => external.id.to_s }
+    expect(response).to have_http_status(:bad_request)
+  end
 end

backend/spec/services/counts_pivot_security_spec.rb

@@ -133,7 +133,6 @@ RSpec.describe 'Counts masked pivot contracts' do
   it 'rejects private predicates and supplied measure coordinates before SQL labels escape' do
     probes = [{ 'resource_id' => PostVersion.first.post_id.to_s },
         { 'tags' => 'A' },
-        { 'tag_refs' => '', 'tag_refs.0.name' => 'A', 'tag_refs.0.tag_id' => tags.first.id.to_s },
         { 'conditions' => '', 'conditions.0.field' => 'title', 'conditions.0.operator' => 'eq',
           'conditions.0.value' => 'hidden-title-0' },
         { 'drill' => '', 'drill.0.field' => 'tags', 'drill.0.value_type' => 'string',

frontend/src/App.tsx

@@ -200,9 +200,11 @@ export const pageRoutes = (
       handle: { locale: 'ja', sitemap: ['static'], preload: locale => locale === 'ja'
 	  ? GekanatorPage.preload () : GekanatorUnavailablePage.preload () } },
     { path: 'counts', element: <CountsResourcePage resource="posts"/>,
-      handle: { preload: CountsResourcePage.preload, prefetch: false, robots: 'noindex' } },
+      handle: { preload: CountsResourcePage.preload, prefetch: false, robots: 'noindex',
+	  switchLocale: switchPostFilterLocale } },
     { path: 'counts/posts', element: <CountsResourcePage resource="posts"/>,
-      handle: { preload: CountsResourcePage.preload, prefetch: false, robots: 'noindex' } },
+      handle: { preload: CountsResourcePage.preload, prefetch: false, robots: 'noindex',
+	  switchLocale: switchPostFilterLocale } },
     { path: 'counts/tags', element: <CountsResourcePage resource="tags"/>,
       handle: { preload: CountsResourcePage.preload, prefetch: false, robots: 'noindex' } },
     { path: 'counts/nico-tags', element: <CountsResourcePage resource="nico_tags"/>,

frontend/src/components/TagSidebar.tsx

@@ -43,6 +43,12 @@ const TagSidebar: FC<Props> = ({ posts, onClick }) => {
   const query = new URLSearchParams (location.search)
   const tagsQuery = query.get ('tags') ?? ''
   const anyFlg = query.get ('match') === 'any'
+  const countsQuery = new URLSearchParams ({ tags: tagsQuery })
+  for (const [key, value] of query)
+    {
+      if (key === 'match')
+	countsQuery.append (key, value)
+    }
 
   useEffect (() => {
     const tagsTmp: TagByCategory = { }
@@ -120,7 +126,7 @@ const TagSidebar: FC<Props> = ({ posts, onClick }) => {
 	    </a>
 	  </li>
 	  <li>
-	    <PrefetchLink to={`/counts/posts?tags=${ encodeURIComponent (tagsQuery) }`}>
+	    <PrefetchLink to={`/counts/posts?${ countsQuery }`}>
 	      {label ('actions.count')}
 	    </PrefetchLink>
 	  </li>

frontend/src/components/counts/CountsControls.test.tsx

@@ -68,22 +68,17 @@ describe ('Counts filter draft', () => {
     expect (screen.queryByText ('pattern.input')).not.toBeInTheDocument ()
   })
 
-  it ('retains stable references only for surviving search tokens', () => {
-    const params = appliedParams ({ tags: 'alpha beta' })
-    setCountState (params, 'tag_refs', encodeCountState ('tag_refs', [
-	{ name: 'alpha', tag_id: 7 }, { name: 'beta', external_tag_id: 8 }]))
-    const { execute } = renderControls (params)
+  it ('submits only the edited tag names', () => {
+    const { execute } = renderControls (appliedParams ({ tags: 'alpha beta' }))
     const tags = screen.getByDisplayValue ('alpha beta')
     fireEvent.change (tags, { target: { value: 'not:beta gamma alpha' } })
     submit ()
-    expect (readCountState (execute.mock.lastCall![0], 'tag_refs', [])).toEqual ([
-	{ name: 'alpha', tag_id: 7 }, { name: 'not:beta', external_tag_id: 8, negative: true }])
+    expect (execute.mock.lastCall![0].get ('tags')).toBe ('not:beta gamma alpha')
     fireEvent.change (tags, { target: { value: 'gamma' } })
     submit ()
-    expect (readCountState (execute.mock.lastCall![0], 'tag_refs', [])).toEqual ([])
     expect (execute.mock.lastCall![0].get ('tags')).toBe ('gamma')
-    expect (screen.queryByText (/internal:7|external:8/)).not.toBeInTheDocument ()
   })
+
 })
 
 

frontend/src/components/counts/CountsControls.tsx

@@ -17,7 +17,7 @@ import { useClientMotion } from '@/lib/useClientMotion'
 import { inputClass } from '@/lib/utils'
 import { useUITranslation } from '@/lib/useUITranslation'
 
-import { readCountState, setCountState, encodeCountState } from '@/lib/queryState'
+import { readCountState, setCountState } from '@/lib/queryState'
 
 import type { ReactNode } from 'react'
 
@@ -97,27 +97,6 @@ const CountsControls = (
   const update = (key: string, value: string) => setDraft (previous => {
     const next = new URLSearchParams (previous)
     setCountState (next, key, value)
-    if (key === 'tags')
-    {
-      const tokens = value.split (/\s+/).filter (token => token
-          && token.toLowerCase () !== 'type:or')
-      const remaining = [...tokens]
-      const references = readCountState<Record<string, string | number | boolean>[]> (
-          previous, 'tag_refs', []).flatMap (reference => {
-        const name = String (reference.name)
-        const exact = remaining.indexOf (name)
-        const index = exact >= 0 ? exact : remaining.findIndex (token =>
-            token.replace (/^not:/i, '') === name.replace (/^not:/i, ''))
-        if (index < 0) return []
-        const [token] = remaining.splice (index, 1)
-        return [token === name ? reference : { ...reference, name: token,
-            negative: token.toLowerCase ().startsWith ('not:') }]
-      })
-      for (const name of [...next.keys ()])
-        if (name === 'tag_refs' || name.startsWith ('tag_refs.')) next.delete (name)
-      if (references.length > 0)
-        setCountState (next, 'tag_refs', encodeCountState ('tag_refs', references))
-    }
     if (key === 'limit') next.delete ('page')
     if (next.toString () === previous.toString ()) return previous
     if (['rows', 'cols'].includes (key) && next.get ('sort') !== '') next.delete ('sort')
@@ -278,8 +257,7 @@ const CountsControls = (
                     aria-label={message ('remove').text} onClick={() => setDraft (previous => {
                       const next = new URLSearchParams (previous)
                       for (const key of [...next.keys ()])
-                        if (['tags', 'tag', 'kind', 'match', 'tag_refs', 'page'].includes (key)
-                            || key.startsWith ('tag_refs.')) next.delete (key)
+                        if (['tags', 'tag', 'kind', 'match', 'page'].includes (key)) next.delete (key)
                       return next
                     })}>×</Button>
               </>}

frontend/src/lib/posts.test.ts

@@ -1,6 +1,7 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
-import { fetchPostChanges, fetchPosts, toggleViewedFlg, updatePost } from '@/lib/posts'
+import { fetchPostChanges, fetchPosts, switchPostFilterLocale, toggleViewedFlg, updatePost }
+    from '@/lib/posts'
 
 import type { FetchPostsParams } from '@/types'
 
@@ -34,6 +35,21 @@ describe ('posts API functions', () => {
     vi.clearAllMocks ()
   })
 
+  it ('switches current tag names without adding identity state to the URL', async () => {
+    api.apiGet.mockResolvedValueOnce ({ tags: 'シロシ not:nico:shared' })
+    const path = await switchPostFilterLocale ({
+	location: { pathname: '/ja/counts/posts',
+	    search: '?tags=source+not%3Anico%3Ashared&match=any', hash: '#table' },
+	params: {}, locale: 'ja', targetLocale: 'ain-Kana' })
+    expect (api.apiGet).toHaveBeenCalledWith ('/posts/tag_filters', {
+	locale: 'ja', params: { tags: 'source not:nico:shared', target_locale: 'ain-Kana' } })
+    const url = new URL (path, 'https://example.test')
+    expect (url.pathname).toBe ('/ain-Kana/counts/posts')
+    expect (Object.fromEntries (url.searchParams)).toEqual ({
+	tags: 'シロシ not:nico:shared', match: 'any' })
+    expect (url.hash).toBe ('#table')
+  })
+
   it ('maps post search parameters to backend snake_case names', async () => {
     api.apiGet.mockResolvedValueOnce ({ posts: [], count: 0 })
 

frontend/src/lib/posts.ts

@@ -1,5 +1,4 @@
 import { apiDelete, apiGet, apiPost, apiPut } from '@/lib/api'
-import { queryRecordParams, setQueryRecords } from '@/lib/queryState'
 import { switchLocalePath } from '@/lib/locales'
 
 import type { LocaleCode } from '@/lib/locales'
@@ -8,7 +7,7 @@ import type { FetchPostsParams, Post, PostVersion } from '@/types'
 
 
 export const fetchPosts = async (
-    { url, title, tags, tagReferences, match, createdFrom, createdTo, updatedFrom, updatedTo,
+    { url, title, tags, match, createdFrom, createdTo, updatedFrom, updatedTo,
       originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams,
     locale: LocaleCode = 'ja',
 ): Promise<{
@@ -18,7 +17,6 @@ export const fetchPosts = async (
 	    ...(url && { url }),
 	    ...(title && { title }),
 	    ...(tags && { tags }),
-	    ...(tagReferences && queryRecordParams (new URLSearchParams (tagReferences), 'tag_refs')),
 	    ...(match && { match }),
 	    ...(createdFrom && { created_from: createdFrom }),
 	    ...(createdTo && { created_to: createdTo }),
@@ -39,21 +37,9 @@ export const switchPostFilterLocale = async (
   if (tags == null || tags.trim () === '')
     return switchLocalePath (location, targetLocale)
 
-  const { references } = await apiGet<{ references: {
-      name: string
-      tagId?: number
-      externalTagId?: number
-      negative?: boolean
-      missing?: boolean }[] }> ('/posts/tag_filters', {
-	locale, params: { tags, target_locale: targetLocale,
-	  ...queryRecordParams (query, 'tag_refs') } })
-  query.set ('tags', references.map (reference => reference.name).join (' '))
-  setQueryRecords (query, 'tag_refs', references.map (reference => ({
-      name: reference.name,
-      negative: reference.negative,
-      ...(reference.tagId != null && { tag_id: reference.tagId }),
-      ...(reference.externalTagId != null && { external_tag_id: reference.externalTagId }),
-      ...(reference.missing && { missing: true }) })))
+  const result = await apiGet<{ tags: string }> ('/posts/tag_filters', {
+      locale, params: { tags, target_locale: targetLocale } })
+  query.set ('tags', result.tags)
   return switchLocalePath ({ ...location, search: `?${query}` }, targetLocale)
 }
 

frontend/src/lib/prefetchers.ts

@@ -9,7 +9,6 @@ import { getHelpArticle,
 import { localeFromPath, localeLanguage, unlocalisedPath } from '@/lib/locales'
 import { fetchPost, fetchPosts, fetchPostChanges } from '@/lib/posts'
 import { helpKeys, postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
-import { queryRecordParams } from '@/lib/queryState'
 import { isCountsPath } from '@/lib/routeLocales'
 import { fetchNicoTags, fetchTag, fetchTagChanges, fetchTags } from '@/lib/tags'
 import { fetchWikiAutolinkCandidates,
@@ -178,8 +177,6 @@ const prefetchPostsIndex: Prefetcher = async (qc, url, locale) => {
 
   const keys = {
       tags, match: m, page, limit, url: qURL, title,
-      ...(url.searchParams.has ('tag_refs') && {
-	tagReferences: new URLSearchParams (queryRecordParams (url.searchParams, 'tag_refs')).toString () }),
       originalCreatedFrom, originalCreatedTo, createdFrom, createdTo,
       updatedFrom, updatedTo, order }
 

frontend/src/lib/queryState.ts

@@ -4,7 +4,6 @@ const schemas: Record<string, string[]> = {
     conditions: ['field', 'operator', 'value', 'end', 'blank', 'input', 'values', 'grain', 'value_type'],
     condition_values: ['condition', 'value', 'value_type'],
     drill: ['field', 'grain', 'value', 'value_type'],
-    tag_refs: ['name', 'tag_id', 'external_tag_id', 'negative', 'missing'],
     column_order: ['value', 'value_type'],
     measures: ['key', 'axis', 'value', 'value_type'] }
 
@@ -24,8 +23,8 @@ export const queryRecords = (params: URLSearchParams, key: string): QueryRecord[
     const index = Number (parts[0])
     const record = indexed.get (index) ?? { }
     const field = parts[1]
-    record[field] = ['blank', 'negative', 'missing', 'values'].includes (field)
-        ? value === '1' : (['tag_id', 'external_tag_id', 'axis', 'condition'].includes (field)
+    record[field] = ['blank', 'values'].includes (field)
+        ? value === '1' : (['axis', 'condition'].includes (field)
             ? Number (value) : value)
     indexed.set (index, record)
   }
@@ -59,7 +58,7 @@ export const setQueryRecords = (
         params.set (`${key}.${index}.value_type`, value == null ? 'null' : typeof value)
       if (value == null) continue
       params.set (name, typeof value === 'boolean'
-          ? (['blank', 'negative', 'missing', 'values'].includes (field)
+          ? (['blank', 'values'].includes (field)
 	      ? (value ? '1' : '0') : String (value))
           : String (value))
     }

frontend/src/pages/CountsResourcePage.test.tsx

@@ -1,4 +1,4 @@
-import { act, fireEvent, screen, waitFor } from '@testing-library/react'
+import { act, fireEvent, screen, waitFor, within } from '@testing-library/react'
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
 import { hydrateRoot } from 'react-dom/client'
 import { renderToString } from 'react-dom/server'
@@ -36,6 +36,9 @@ const execute = () => fireEvent.submit (
     screen.getByText ('集計実行').closest ('form')!)
 const openConditions = () => fireEvent.click (
     screen.getByText ('集計条件').closest ('button')!)
+const resourceInput = () => within (
+    screen.getByText ('抽出条件', { selector: 'legend' }).closest ('fieldset')!,
+).getByRole ('textbox', { name: 'Id.' })
 const renderPage = (extra = '') => renderWithProviders (<>
   <CountsResourcePage resource="posts"/><Location/>
 </>, { route: `/ja/counts/posts?mode=details&timezone=UTC${extra}` })
@@ -149,7 +152,7 @@ describe ('Counts execution and URL state', () => {
 	 await waitForResult (queryClient)
 	 await waitFor (() => expect (currentParams ().get ('execution_at')).toBe (executionAt))
 	 openConditions ()
-	 const input = screen.getByRole ('textbox', { name: 'Id.' })
+	 const input = resourceInput ()
 	 fireEvent.change (input, { target: { value: '7' } })
 	 fireEvent.change (screen.getByLabelText ('表示件数', { selector: 'select' }), {
 	     target: { value: '20' } })
@@ -167,7 +170,7 @@ describe ('Counts execution and URL state', () => {
 	 await waitFor (() => expect (fetchCounts).toHaveBeenCalledTimes (2))
 	 expect (fetchCounts.mock.calls[1][1].get ('resource_id')).toBe ('7')
 	 expect (currentParams ().toString ()).toBe (oldURL)
-	 expect (screen.getByRole ('textbox', { name: 'Id.' })).toBe (input)
+	 expect (resourceInput ()).toBe (input)
 	 await act (async () => complete ({ ...detailResult,
 	     executionAt: '2024-03-02T00:00:00.000000Z', limit: 20 }))
 	 await waitFor (() => expect (currentParams ().get ('resource_id')).toBe ('7'))
@@ -182,14 +185,14 @@ describe ('Counts execution and URL state', () => {
     await waitForResult (queryClient)
     await waitFor (() => expect (currentParams ().get ('execution_at')).toBe (executionAt))
     openConditions ()
-    fireEvent.change (screen.getByRole ('textbox', { name: 'Id.' }), {
+    fireEvent.change (resourceInput (), {
 	target: { value: '99' } })
     fetchCounts.mockRejectedValueOnce (new Error ('offline'))
     execute ()
     await screen.findByRole ('alert')
     expect (fetchCounts).toHaveBeenCalledTimes (2)
     expect (fetchCounts.mock.calls[1][1].get ('resource_id')).toBe ('99')
-    expect (screen.getByRole ('textbox', { name: 'Id.' })).toHaveValue ('99')
+    expect (resourceInput ()).toHaveValue ('99')
     expect (currentParams ().has ('resource_id')).toBe (false)
   })
 

frontend/src/pages/posts/PostListPage.tsx

@@ -1,4 +1,3 @@
-import { queryRecordParams } from '@/lib/queryState'
 import { useQuery } from '@tanstack/react-query'
 import { useEffect, useLayoutEffect, useMemo, useRef, useState } from 'react'
 import { useLocation } from 'react-router-dom'
@@ -62,7 +61,6 @@ const PostListPage: FC = () => {
 
   const keys = {
       tags: tagsKey, match, page, limit,
-      ...(query.has ('tag_refs') && { tagReferences: new URLSearchParams (queryRecordParams (query, 'tag_refs')).toString () }),
       url: '', title: '', originalCreatedFrom: '', originalCreatedTo: '',
       createdFrom: '', createdTo: '', updatedFrom: '', updatedTo: '',
       order } as const

frontend/src/pages/posts/PostSearchPage.tsx

@@ -1,4 +1,3 @@
-import { queryRecordParams } from '@/lib/queryState'
 import { useQuery } from '@tanstack/react-query'
 import { motion } from 'framer-motion'
 import { useEffect, useMemo, useState } from 'react'
@@ -127,7 +126,6 @@ const PostSearchPage: FC = () => {
 
   const keys: FetchPostsParams = {
       tags: qTags, match: qMatch, page, limit,
-      ...(query.has ('tag_refs') && { tagReferences: new URLSearchParams (queryRecordParams (query, 'tag_refs')).toString () }),
       url: qURL,
       title: qTitle,
       originalCreatedFrom: qOriginalCreatedFrom,

frontend/src/types.ts

@@ -20,7 +20,6 @@ export type FetchPostsParams = {
     url:                  string
     title:                string
     tags:                 string
-    tagReferences?:       string
     match:                'all' | 'any'
     originalCreatedFrom:  string
     originalCreatedTo:    string