如何列出与一个属性无关的DataMapper错误?

时间:2012-04-05 20:51:19

标签: datamapper datamapper-1.2

DataMapper模型允许自定义两种形式的验证:特定于属性的形式,以及整体对象验证。例如:

 # Validates the `name` property with the `check_name` method;
 # any errors will be under `object.errors[:name]`
 validates_with_method :name, method: :check_name

 # Validates the object overall with the `overall_soundness` method;
 # any errors will be under `object.errors[:overall_soundness]`
 validates_with_method :overall_soundness

第二种类型对涉及多个属性的验证有意义,但它也存在一个问题:向用户显示错误。

我想在表单页面顶部显示未附加到特定属性的所有错误,但我看不到任何简单的方法来列出它们。

如何获取非属性特定错误列表?

(我正在使用DataMapper 1.2.0)

2 个答案:

答案 0 :(得分:0)

一种hacky方式

我希望有更多的本土方式。我已将此方法添加到我的模型中:

# Validation errors not tied to a specific property. For instance, 
# "end date must be on or before start date" (neither property is 
# wrong individually, but the combination makes the model invalid)
# @return [Array] of error message strings
def general_validation_errors
  general_errors = []

  general_error_keys = errors.keys.reject do |error|
    # Throw away any errors that match property names
    self.send(:properties).map(&:name).include?(error) || error == :error
  end

  general_error_keys.each do |key|
    general_errors << self.errors[key]
  end

  general_errors.flatten
end

在表单的顶部,我可以这样做:

- if @my_model.general_validation_errors.any?
  .errors
    %ul
      - @my_model.general_validation_errors.each do |error_message|
        %li= error_message

或者,给Formtastic的猴子补丁允许f.general_validation_errors

# Let Formtastic forms use f.general_validation_errors to display these (if any)
module Formtastic
  module Helpers
    module ErrorsHelper
      def general_validation_errors
        unless @object.respond_to?(:general_validation_errors)
          raise ArgumentError.new(
            "#{@object.class} doesn't have a general_validation_errors method for Formtastic to call (did you include the module?)"
          )
        end

        if @object.general_validation_errors.any?
          template.content_tag(:div, class: 'errors') do
            template.content_tag(:ul) do
              content = ''
              @object.general_validation_errors.each do |error|
                content << template.content_tag(:li) do
                  error
                end
              end
              content.html_safe
            end
          end
        end
      end
    end
  end
end

答案 1 :(得分:0)

用于显示......你可以使用闪光灯吗?

由于您还没有标记某种语言,我只会放置Ruby和Sinatra的内容,也许您可​​以找到相应的DSL。

在您的视图中使用相关条件语句

flash.now[:errors]

和路线flash[:errors] = User.errors