class User
include Mongoid::Document
has_many :images
accepts_nested_attributes_for :image
end
class Image
include Mongoid::Document
include Mongoid::Timestamps
include Mongoid::Paperclip
has_mongoid_attached_file :uploaded_image,
:path => ":rails_root/public/uploads/:class/:id/:basename.:extension",
:url => "public/uploads/"
validates_attachment_content_type :uploaded_file, :content_type => "application/png", :message => "error massage"
belongs_to :user
delegate :url, :path, to: :uploaded_image, allow_nil: true, prefix: false
end
如果:uploaded_image无效,如何将错误从Image委托给用户?
例如:
user_image = user.images.build(uploaded_image: new_image.path)
user_image.save
如果uploaded_image无效,则会出现错误。
答案 0 :(得分:1)
Rails有validates_associated
助手(在Mongoid中也可用),它会在每个关联对象上调用valid?
。
validates_associated的默认错误消息是“无效”。 请注意,每个关联的对象都将包含自己的错误 采集;错误不会冒泡到调用模型。
class User
include Mongoid::Document
has_many :images
accepts_nested_attributes_for :image
validates_associated :images
end
注意您不应将validates_associated :user
添加到Image
,因为它会导致无限循环。
您可以访问嵌套图像的错误,如下所示:
<% if @user.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>
<ul>
<% @user.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
<% if @user.images.any? %>
<ul>
<% @user.images.each do |image| %>
<% if image.errors.any? %>
<li>
<ul>
<% image.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</li>
<% end %>
<% end %>
</ul>
<% end %>
</div>
<% end %>