使语义错误呈现准确的错误消息 [英] Make semantic_errors render the exact error-message

问题描述

我有一个模型 Camping ，其中 has_many 图片 。露营时至少需要一张图片：

  class Camping< ActiveRecord :: Base 
 attr_accessible：images_attributes 
 has_many：images 
 validates_presence_of：images，：message => 至少需要一张图片 
 accepts_nested_attributes_for：images，：allow_destroy => true 
 end 
  

然后，在似乎暗示Formtastic总是在错误中添加：attribute 名称；但是我不太确定这段代码是如何工作的。

解决方案

如果您要使用此类自定义消息，则可以添加以下错误消息：与对象的整体状态有关，而不与特定属性有关

更改此

  validates_presence_of：images，：message => 至少需要一张图片 
  

类似

 验证：should_have_images 
 def should_have_images 
 errors.add（：base，至少需要一张图像）如果images.blank？ 
结束
  

I have a model Camping which has_many Images. At least one image is required on Camping:

class Camping < ActiveRecord::Base
  attr_accessible :images_attributes
  has_many :images
  validates_presence_of :images, :message => "At least one image is required"
  accepts_nested_attributes_for :images, :allow_destroy => true
 end

Then, in active_admin, which uses formtastic, I render the error message At least one image is required, with f.semantic_errors:

ActiveAdmin.register Camping do
  form :html => { :multipart => true } do |f|
     f.semantic_errors :images
     #....
     f.inputs "Images" do
      f.has_many :images do |img|
        #....
      end
    end
    #....
  end
end

This renders as:

Images At least one image is required.

How can I make it render: At least one image is required?

changing the f.semantic_errors :images into 'f.semantic_errors (removing :images) makes it render nothing; no error at all.

Note: The API documentation seems to imply that Formtastic always adds the :attribute name to the error; but I am not entirely sure how this code works.

解决方案

If you want to use such custom messages you can add error messages that are related to the object’s state as a whole, instead of being related to a specific attribute

Change this

validates_presence_of :images, :message => "At least one image is required"

to something like

   validate :should_have_images
   def should_have_images
       errors.add(:base, "At least one image is required") if images.blank?
   end

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