[英]rails fields_for parent id not being set on child model
I have been working from the rails api documents for NestedAttributes and FormHelper and searching stackoverflow. 我一直在使用NestedAttributes和FormHelper的rails api文档和搜索stackoverflow。
I have the following code in my new.html.haml view: 我在new.html.haml视图中有以下代码:
=form_for listing, :html => {:id => :listing_form, :multipart => :true} do |f|
=f.fields_for :main_picture, (listing.main_picture || listing.build_main_picture) do |fmp|
=fmp.hidden_field :main, :value => 1
=fmp.file_field :image, :class => :picture_select
And the following code in my controller: 以下代码在我的控制器中:
def create
@listing = Listing.new(params[:listing])
@listing.save ? redirect_to(:root) : render('listings/new')
end
Here is my listing.rb: 这是我的listing.rb:
class Listing < ActiveRecord::Base
has_one :main_picture, :class_name => "Picture", :conditions => {:main => true}
attr_accessible :main_picture_attributes
accepts_nested_attributes_for :main_picture, :allow_destroy => true
end
And my picture.rb: 还有我的照片.rb:
class Picture < ActiveRecord::Base
belongs_to :listing
validates_presence_of :listing
attr_accessible :listing, :main
end
And I get the following error message when I try and submit my form: 当我尝试提交表单时收到以下错误消息:
main_picture.listing: can't be blank
I can't work out why the framework is not automatically setting the listing_id field of the main_picture (object Picture) to id value of parent Listing object. 我无法弄清楚为什么框架不会自动将main_picture(对象图片)的listing_id字段设置为父列表对象的id值。
Is there something I am doing wrong? 有什么我做错了吗?
Do you need the validates_presence_of :listing
? 您需要
validates_presence_of :listing
吗? I suspect that the child record is getting created before the parent object, and so it doesn't have an ID yet. 我怀疑子记录是在父对象之前创建的,因此它还没有ID。
Removing that line and adding :dependent => :destroy
to your has_one :main_picture
would ensure you don't end up with orphan picture records. 删除该行并将
:dependent => :destroy
到has_one :main_picture
将确保您不会以孤儿图片记录结束。
Alternatively, rewrite your controller: 或者,重写您的控制器:
p = params[:listing]
@listing = Listing.new(p)
@picture = Picture.new(p.delete(:main_picture).merge({:listing => @listing})
etc.
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