Rails 5: How to pass collection_select values ​​through strong_params to fields_for?

Question

Ive tried all the videos and articles and still could not find a solution to get the event_ fields_to select the whitelisted values ​​in strong_params. I spent days trying to figure it out (and asked a number of people). If anyone could spend time helping, I would be very grateful!

I have a relationship between many and many between List and Topic, with List_Topic acting as a union model. Using form_for, I created a form for the (@list) List instance, and then field_for: list_topics. In the fields for which Ive created collection_select, which is populated by Topic.all.

<br>
 <%= form_for(@list) do |f| %>
  <%= f.label :subject %>
  <%= f.text_field :subject %>
<br>
<br>

 <%= f.fields_for :list_topics do |ff| %>
  <%= ff.label "Choose a Topic:"  %><br>
  <%= ff.label :content %>
  <%= ff.text_field :content %>
  <%= ff.collection_select(:id, @all_topics, :id, :name, {}, {multiple: true}) %>
 <% end %>

 <%= f.submit %>
<% end %>

In my list controller, I:

class ListsController < ApplicationController

  def new
    @list = List.new
    @all_topics = Topic.all
    @list.list_topics.build 
  end

  def create
    @list = List.new(list_params)
  end

private

  def list_params
    params.require(:list).permit(:subject, :list_topics_attributes =>    [:topic, :content, :topic_ids, :id, :ids])
  end  

end

Parameters from the form for fields_for are passed as:

list_topics_attributes"=>{"0"=>{"content"=>"Hey", "id"=>["", "2"]}}} 

strong_params @list, custom_attribute, , : fields_for through: list_topics_attributes, : id strong_params collection_select , , /, . .

git repo. /new

https://github.com/jwolfe890/Top5/blob/master/app/views/lists/new.html.erb

!

Answer 1

- , , . , :

params.require(:list).permit(:subject, :list_topics_attributes => [ :content, id: []])

, - list_topics_attributes, id - list_topics_attributes, THAT: id .

!