嵌入式多态关联模型形式

Question

I have these models:

model 1:

module Ems  
  class Article < ActiveRecord::Base
    has_many :images, :as => :imageable
    accepts_nested_attributes_for :images 
  end
end

model 2:

module Ems
  class Image < ActiveRecord::Base
    belongs_to :imageable, :polymorphic => true
  end
end

view:

= form_for @article do |f|
  %div
    = f.label :title
    = f.text_field :title
  %div
    - f.fields_for :images do |builder| 
      = builder.label :title
      = builder.text_field :title

I don't get any errors however I also dont get the form fields for the embedded image form. All I get is an empty DIV.

Can anyone point me in the right direction?
Thanks

Answer 1

try after replacing - with = at where you are calling fields_for

 = f.fields_for :images do |builder|

The fields_for returns form HTML, so you need to render it on UI.