#434

backend/app/services/counts_resource_definition.rb

@@ -112,19 +112,29 @@ class CountsResourceDefinition
   def field_label(key) = LABELS.fetch(key, "counts:attributes.#{ key }")
 
   def self.name_key(code) = "name_#{ code.to_s.downcase.tr('-', '_') }"
+  def self.aliases_key(code) = "aliases_#{ 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 } }
+    @name_columns ||= Locale.select(:code, :language_code, :script_code).order(:code)
+        .flat_map do |locale|
+      codes = { code: locale.code, language_code: locale.language_code,
+                script_code: locale.script_code }
+      [{ key: self.class.name_key(locale.code), label: 'counts:localeName', name_locale: codes },
+       { key: self.class.aliases_key(locale.code), label: 'counts:localeAliases',
+         name_locale: codes, multiple_values: true }]
     end
   end
 
   def name_column(key) = name_columns.find { _1[:key] == key }
 
   def name_expression(key, row = 'v')
+    if key.start_with?('aliases_')
+      source, value = alias_source(key, row)
+      return "CAST(COALESCE((SELECT JSON_ARRAYAGG(#{ value }) OVER (" +
+          'ORDER BY locale_alias.ordinal ROWS BETWEEN UNBOUNDED PRECEDING ' +
+          "AND UNBOUNDED FOLLOWING) FROM #{ source } WHERE #{ value } IS NOT NULL " +
+          'LIMIT 1), JSON_ARRAY()) AS CHAR) COLLATE utf8mb4_bin'
+    end
     locale = name_column(key).fetch(:name_locale)
     connection = model.connection
     path = connection.quote("$.#{ locale[:language_code].to_json }")
@@ -135,6 +145,19 @@ class CountsResourceDefinition
         "CONCAT(#{ path }, '.name')), CAST('null' AS JSON))) END"
   end
 
+  def alias_source(key, row = 'v')
+    locale = name_column(key).fetch(:name_locale)
+    connection = model.connection
+    path = connection.quote("$.#{ locale[:language_code].to_json }.aliases[*]")
+    script = connection.quote(locale[:script_code])
+    source = "JSON_TABLE(COALESCE(#{ row }.names, JSON_OBJECT()), #{ path } " +
+        "COLUMNS (ordinal FOR ORDINALITY, name TEXT PATH '$.name', " +
+        "script TEXT PATH '$.script_code')) locale_alias"
+    value = "CASE WHEN LOWER(locale_alias.script) = LOWER(#{ script }) " +
+        'THEN locale_alias.name END'
+    [source, value]
+  end
+
   def output_fields
     content = case resource
               when 'posts'
@@ -149,6 +172,7 @@ class CountsResourceDefinition
     keys.flat_map do |key|
       next name_columns if key == 'name' && resource == 'tags'
       next [] if key == 'names' && resource == 'tags'
+      next [] if key == 'aliases' && resource == 'tags'
       label = if key == 'parents'
                 resource == 'tags' ? 'tags:parents' : 'shared:labels.parentPosts'
               else field_label(key)
@@ -174,6 +198,7 @@ class CountsResourceDefinition
            else []
            end
     keys.flat_map do |child|
+      next [] if child == 'aliases' && key == 'tags'
       if child == 'name' && ['tags', 'parents'].include?(key)
         next [{ key: child, label: CHILD_LABELS.fetch(child) }, *name_columns]
       end
@@ -194,14 +219,16 @@ class CountsResourceDefinition
     fields = output_fields
     if resource == 'tags'
       fields += [{ key: 'name', label: 'counts:columns.name' },
-          { key: 'names', label: 'counts:columns.names', children: child_fields('names') }]
+          { key: 'names', label: 'counts:columns.names', children: child_fields('names') },
+          { key: 'aliases', label: 'tags:aliases', children: child_fields('aliases') }]
     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') }])
+            { key: 'names', label: 'counts:columns.names', children: child_fields('names') },
+            { key: 'aliases', label: 'tags:aliases', children: child_fields('aliases') }])
       end
     end
     fields