class method self.check_all_foreign_keys_valid!

# File activerecord/lib/active_record/fixtures.rb, line 696
        def check_all_foreign_keys_valid!(conn)
          return unless ActiveRecord.verify_foreign_keys_for_fixtures

          begin
            conn.check_all_foreign_keys_valid!
          rescue ActiveRecord::StatementInvalid => e
            raise "Foreign key violations found in your fixture data. Ensure you aren't referring to labels that don't exist on associations. Error from database:\n\n#{e.message}"
          end
        end