#434

backend/app/services/counts_resource_definition.rb

@@ -111,6 +111,30 @@ class CountsResourceDefinition
 
   def field_label(key) = LABELS.fetch(key, "counts:attributes.#{ key }")
 
+  def self.name_key(code) = "name_#{ code.to_s.downcase.tr('-', '_') }"
+
+  def name_columns
+    @name_columns ||= Locale.order(:code).map do |locale|
+      { key: self.class.name_key(locale.code), label: 'counts:localeName',
+        label_values: { locale: locale.name },
+        name_locale: { code: locale.code, language_code: locale.language_code,
+            script_code: locale.script_code } }
+    end
+  end
+
+  def name_column(key) = name_columns.find { _1[:key] == key }
+
+  def name_expression(key, row = 'v')
+    locale = name_column(key).fetch(:name_locale)
+    connection = model.connection
+    path = connection.quote("$.#{ locale[:language_code].to_json }")
+    script = connection.quote(locale[:script_code])
+    "CASE WHEN LOWER(JSON_UNQUOTE(JSON_EXTRACT(#{ row }.names, " +
+        "CONCAT(#{ path }, '.script_code')))) = LOWER(#{ script }) " +
+        "THEN JSON_UNQUOTE(NULLIF(JSON_EXTRACT(#{ row }.names, " +
+        "CONCAT(#{ path }, '.name')), CAST('null' AS JSON))) END"
+  end
+
   def output_fields
     content = case resource
               when 'posts'
@@ -122,7 +146,9 @@ class CountsResourceDefinition
     keys = ['resource_id', 'version_no', 'latest'] + (content - ['thumbnail']) +
         ['event_type', 'user', 'created_at']
     keys.unshift('thumbnail') if content.include?('thumbnail')
-    keys.map do |key|
+    keys.flat_map do |key|
+      next name_columns if key == 'name' && resource == 'tags'
+      next [] if key == 'names' && resource == 'tags'
       label = if key == 'parents'
                 resource == 'tags' ? 'tags:parents' : 'shared:labels.parentPosts'
               else field_label(key)
@@ -130,16 +156,15 @@ class CountsResourceDefinition
       field = { key:, label: }
       children = child_fields(key)
       field[:children] = children if children.any?
-      field
+      [field]
     end
   end
 
   def child_fields(key, depth = 4)
     keys = case key
-           when 'tags' then ['id', 'versionNo', 'kind', 'name', 'category', 'sections', 'names']
+           when 'tags' then ['id', 'versionNo', 'kind', 'name', 'category', 'sections', 'aliases']
            when 'names' then ['languageCode', 'scriptCode', 'name', 'aliases', 'autoGenerated']
-           when 'aliases'
-             resource == 'tags' ? ['languageCode', 'name', 'scriptCode'] : ['name', 'scriptCode']
+           when 'aliases' then ['languageCode', 'name', 'scriptCode']
            when 'parents' then resource == 'tags' ? ['id', 'name'] : ['id']
            when 'members' then ['tagId', 'tagGroupId', 'versionNo']
            when 'export_paths_json' then ['profile', 'path']
@@ -148,17 +173,39 @@ class CountsResourceDefinition
              scalar + (depth > 0 ? ['children'] : [])
            else []
            end
-    keys.map do |child|
+    keys.flat_map do |child|
+      if child == 'name' && ['tags', 'parents'].include?(key)
+        next [{ key: child, label: CHILD_LABELS.fetch(child) }, *name_columns]
+      end
       label = key == 'members' && child == 'tagId' ?
           'counts:columns.resourceId' : CHILD_LABELS.fetch(child)
       field = { key: child, label: }
       children = child_fields(child, child == 'children' ? depth - 1 : depth)
       # Language is attached to top-level aliases, not to aliases inside a language entry.
-      children = children.reject { _1[:key] == 'languageCode' } if child == 'aliases'
+      if child == 'aliases' && key == 'names'
+        children = children.reject { _1[:key] == 'languageCode' }
+      end
       field[:children] = children if children.any?
-      field
+      [field]
     end
   end
 
+  def condition_fields
+    fields = output_fields
+    if resource == 'tags'
+      fields += [{ key: 'name', label: 'counts:columns.name' },
+          { key: 'names', label: 'counts:columns.names', children: child_fields('names') }]
+    end
+    if resource == 'posts'
+      fields = fields.map do |field|
+        next field unless field[:key] == 'tags'
+
+        field.merge(children: field[:children] + [
+            { key: 'names', label: 'counts:columns.names', children: child_fields('names') }])
+      end
+    end
+    fields
+  end
+
   def filter_metadata = @filter_metadata ||= CountsCondition.fields(self)
 end