method

foreign_keys

v5.1.7 - 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 455
      def foreign_keys(table_name)
        raise ArgumentError unless table_name.present?

        scope = quoted_scope(table_name)

        fk_info = exec_query(          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',                 rc.update_rule AS 'on_update',                 rc.delete_rule AS 'on_delete'          FROM information_schema.referential_constraints rc          JOIN information_schema.key_column_usage fk          USING (constraint_schema, constraint_name)          WHERE fk.referenced_column_name IS NOT NULL            AND fk.table_schema = #{scope[:schema]}            AND fk.table_name = #{scope[:name]}            AND rc.constraint_schema = #{scope[:schema]}            AND rc.table_name = #{scope[:name]}.strip_heredoc, "SCHEMA")

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

          options[:on_update] = extract_foreign_key_action(row["on_update"])
          options[:on_delete] = extract_foreign_key_action(row["on_delete"])

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

foreign_keys

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