CODEWITHSUNDEEP
formsruby-on-rails-4nested-formsnested-attributescocoon-gem
Zulhilmi Zainudin
Zulhilmi Zainudin

Reputation: 9365

Standard Rails form + Cocoon gem: undefined method `new_record?' for nil:NilClass error

I'm following this tutorial and the author is using Slim. Since I more familiar with standard Rails form, I try to change the slim markup to normal form like so:

new.html.erb

<%= render 'form' %>

_form.html.erb

<%= form_for(@user) do |f| %>
  <%= f.text_field :name %>

  <br><br>

  <%= fields_for :user_photos do |photo| %>
    <%= render "user_photo_fields", f: photo %>
    <span class="links">
      <%= link_to_add_association "add photo", f, :user_photos %>
    </span>
  <% end %>

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

_user_photo_fields.html.erb

<div class="nested-fields">
    <div class="field">
        <%= f.file_field :photo %>
    </div>
    <%= link_to_remove_association "remove", f %>
</div>

And, this is my models:

class User < ActiveRecord::Base
    has_many :user_photos
    validates_presence_of :name
    accepts_nested_attributes_for :user_photos, allow_destroy: true
end

class UserPhoto < ActiveRecord::Base
    belongs_to :user
    mount_uploader :photo, PhotoUploader
end

And lastly, strong params inside the users_controller.rb. I didn't touch the rest methods inside the controller because I'm using rails g scaffold user name:string generator.

def user_params
      params.require(:user).permit(:name, user_photos_attributes: [:id, :photo, :_destroy])
    end

enter image description here

I get this error:

undefined method `new_record?' for nil:NilClass

What am I missing here?

Upvotes: 2

Views: 917

Answers (2)

sevenseacat
sevenseacat

Reputation: 25029

I believe it's just a simple typo - your fields_for :user_photos should be f.fields_for :user_photos (so that it's properly connected to the parent form).

Upvotes: 3

Mohammad Shahadat Hossain
Mohammad Shahadat Hossain

Reputation: 1349

please try with this. 

class User < ActiveRecord::Base
  has_many :user_photos
  validates_presence_of :name
  accepts_nested_attributes_for :user_photos, allow_destroy: true
end

can you try to fix this by removing the f 

  <div class="nested-fields">
        <div class="field">
            <%= file_field :photo %>
        </div>
        <%= link_to_remove_association "remove" %>
  </div>

Upvotes: 0

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