Adding inputs from a different model in a New form

Question

I have a many_to_many relation with photos and sponsors.

When creating a new Photo, in the new.html.erb view, I would like to add the sponsor attributes (which belong to a different model, but are relationed with photo), but I don't know how to.

I want to add :sponsor_name, :sponsor_web inputs in the Photo creation view, so I can add info about the sponsors the photo has when I create a new photo

I tried creating 2 simple_forms in the same view, one with the photo table attributes, and the other with the sponsor attributes, but didn't work.

Mi view (new.html.erb)

<%= simple_form_for [current_user, @photo] do |f| %>
                    <%= f.button :submit, "Subir Spot"%>
            <% end %>

My Photos#new Controller

def new
    @photo = Photo.new
    @sponsor = @photo.sponsors
end

Be careful, you are mixing singular and plural names for the same things. If you want to create or update multiple objects within one form, see nested_attributes. — pierallard
– pierallard, Commented Sep 9, 2014 at 10:31
Ok thank you, just looked at that. But, how about those nested attributes? Should I add them as well as strong parameters in Photos Controller? Thanks! — Gibson
– Gibson, Commented Sep 9, 2014 at 10:40

Richard Peck · Accepted Answer · 2014-09-09 11:07:06Z

2

Nested

You'll want to use accepts_nested_attributes_for in your Photo model:

#app/models/photo.rb
class Photo < ActiveRecord::Base
   has_many :sponsors
   accepts_nested_attributes_for :sponsors
end

This gives you the ability to use a nested form:

#app/controllers/photos_controller.rb
class PhotosController < ApplicationController
   def new
       @photo = Photo.new
       @photo.sponsors.build
   end

   def create
       @photo = Photo.new photo_params
       @photo.save
   end

   private

   def photo_params
      params.require(:photo).permit(:photo, :params, sponsors_attributes: [:name, :web])
   end
end

#app/views/photos/new.html.erb
<%= form_for @photo do |f| %>
   # Photo attributes here
   <%= f.fields_for :sponsors do |s| %>
      <%= s.text_field :name %>
      <%= s.text_field :web %>
   <% end %>
   <%= f.submit %>
<% end %>

This will work to create a new Sponsor object when you make a new Photo object, thus providing you with the ability to pass nested data.

--

Although this will work for a has_many :through association, you'll want to be careful when using it with has_and_belongs_to_many, as if you just wanted to associate two models, you'll be better populating the [other]_ids method of your new Photo object

I can detail this if you want more information

edited Sep 9, 2014 at 11:07

answered Sep 9, 2014 at 10:49

Richard Peck

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1 Comment

Gibson Over a year ago

Just worked out of the box. Understood perfectly. Thanks so much

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