Rails: Saving many new objects in a nested form

Question

I have 2 models: Video: ``` class Video < ActiveRecord::Base belongs_to :user has_many :thumbnails attr_accessor :search, :saveable accepts_nested_attributes_for :thumbnails, :allow_destroy => true en ``` d Thumbnail: ``` class Thumbnail < ActiveRecord::Base belongs_to :video end ``` I am using the YouTubeG gem in order to search for videos. Each video that is returned by the search has a form in the view: ``` <% form_for :video, :url => videos_path, :html => { :class => :form } do |f| -%> <%= f.hidden_field :url, :value => video.unique_id %> <%= f.hidden_field :name, :value => video.title %> <%= f.hidden_field :user_id, :value => current_user.id %> <% if video.thumbnails.present? %> <% f.fields_for :thumbnails, video do |t| %> <% video.thumbnails.each do |thumbnail| -%> <%=image_tag thumbnail.url %> <%=t.text_field :url, :value => thumbnail.url %> <% end -%> <% end -%> <% end %> <%= f.submit "Save" %> <% end -%> ``` The f.fields_for :thumbnails produces `

Accepted Answer

I found the correct answer: `<% f.fields_for "thumbnails_attributes[]", Thumbnail.new do` |t| %> instead of ``` <% f.fields_for :thumbnails, video do |t| %> ```

Rails: Saving many new objects in a nested form

Solution

Problem