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
How to delegate errors from Image to User if :uploaded_image is invalid?
For example:
user_image = user.images.build(uploaded_image: new_image.path)
user_image.save
Should rise a error if uploaded_image is invalid.
Rails has the validates_associated helper (also available in Mongoid) which will call valid? upon each one of the associated objects.
The default error message for validates_associated is "is invalid".
Note that each associated object will contain its own errors
collection; errors do not bubble up to the calling model.
Rails Guides: Active Record Validations
class User
include Mongoid::Document
has_many :images
accepts_nested_attributes_for :image
validates_associated :images
end
Note that you should not add validates_associated :user to Image since it would cause an infinite loop.
You can access the errors for the nested images like so:
<% 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 %>
