method

foreign_keys

v5.0.0.1 - Show latest stable - 0 notes - Class: ActiveRecord::ConnectionAdapters

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foreign_keys(table_name) public

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# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 513
      def foreign_keys(table_name)
        raise ArgumentError unless table_name.present?

        schema, name = extract_schema_qualified_name(table_name)

        fk_info = select_all           SELECT fk.referenced_table_name as 'to_table'                ,fk.referenced_column_name as 'primary_key'                ,fk.column_name as 'column'                ,fk.constraint_name as 'name'          FROM information_schema.key_column_usage fk          WHERE fk.referenced_column_name is not null            AND fk.table_schema = #{quote(schema)}            AND fk.table_name = #{quote(name)}.strip_heredoc

        create_table_info = create_table_info(table_name)

        fk_info.map do |row|
          options = {
            column: row['column'],
            name: row['name'],
            primary_key: row['primary_key']
          }

          options[:on_update] = extract_foreign_key_action(create_table_info, row['name'], "UPDATE")
          options[:on_delete] = extract_foreign_key_action(create_table_info, row['name'], "DELETE")

          ForeignKeyDefinition.new(table_name, row['to_table'], options)
        end
      end

foreign_keys

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