map_key_with_value

# File activerecord/lib/active_record/insert_all.rb, line 73
    def map_key_with_value
      inserts.map do |attributes|
        attributes = attributes.stringify_keys
        attributes.merge!(@scope_attributes)
        attributes.reverse_merge!(timestamps_for_create) if record_timestamps?

        verify_attributes(attributes)

        keys_including_timestamps.map do |key|
          yield key, attributes[key]
        end
      end
    end