Nested attributes values are not returned on EDIT

Question

When I edit a object, the relationship object values are not displayed in the edit form. The create on other hand is working.

Here are the models:

class LogFile < ActiveRecord::Base
 has_one :config_file, dependent: :destroy
 accepts_nested_attributes_for :config_file, allow_destroy: true
end

class ConfigFile < ActiveRecord::Base
  belongs_to :log_file
end

and this is the controller:

 # GET /log_files/1/edit
  def edit
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_log_file
      @log_file = LogFile.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def log_file_params
      params.require(:log_file).permit(
                                       :name,
                                       :user_id,
                                       config_file_attributes: [:id, :json, :_destroy]
                                       )
    end

The form looks like this:

 <%= f.simple_fields_for :config_file_attributes do |n| %>
    <%= n.input :json %>
 <% end %>

I have firstly try to join or include the relationship model, but was not able to do it. Some of the folks said thar id in the permit() function do the trick, but nothing changes in my situation.

Could anyone advice what to try?

Also when I put the following code in the form template:

<%= debug @log_file %>

no details about the relationship model are returned.

This is the solution I have apply using the accepted answer:

  <% if @log_file.id %>
      <%= f.simple_fields_for :config_file do |n| %>
          <%= n.input :json %>
      <% end %>
  <% else %>
      <%= f.simple_fields_for :config_file_attributes do |n| %>
          <%= n.input :json %>
      <% end %>
  <% end %>

It's normal that @log_file doesn't show related object, you should be able to access it inside the nested from area, but what are you trying to (access) show upon editing? — Nimir
– Nimir, Commented Sep 6, 2014 at 18:04
The config_file has a json field. I am able to populate it on create, but when I edit a record, the field is displayed as empty. I want to display its value instead. — gotqn
– gotqn, Commented Sep 6, 2014 at 18:05

Nimir · Accepted Answer · 2014-09-06 18:10:27Z

1

Try using relation name without _attributes suffix:

<%= f.simple_fields_for :config_file do |n| %>
  <%= n.input :json %>
<% end %>

answered Sep 6, 2014 at 18:10

Nimir

5,8791 gold badge28 silver badges35 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

gotqn Over a year ago

It works, but it breaks the create method now. Is there any standard fix for this, or I should check if I am updating and render it without attribute part?

gotqn Over a year ago

on create the nested form was not rendered.

Nimir Over a year ago

ah, you need to build an object in the new action, something like @log_file.config_file.build so when the form is rendered there is a config_file for your log_file just waiting to be saved

Collectives™ on Stack Overflow

Nested attributes values are not returned on EDIT

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related