def model
      @model ||= begin
        model = find_or_build_model

        set_attributes(model)

        after_build_blocks.each { |block| instance_exec(model, &block) }
        model
      end
    end
def model
      @model ||= begin
        model = find_or_build_model

        set_attributes(model)

        after_build_blocks.each { |block| instance_exec(model, &block) }
        model
      end
    end
The model to be persisted