cocoon gem error: undefined method `new_record?' for nil:NilClass

Question

i'm building a relations Company :has_many Notes.

i want to be able to add some new notes to a just created company in the Comany#show resource. so in the company scaffold's show.html.erb

i have follwed step by step the cocoon demostration app and from the github mardown, but the examples shows only the method to add nested attribute into _form.html.erb partial. I don't know if there is some particular things to do differently, but when i try to run the Company#show action it retrieves this error:

undefined method `new_record?' for nil:NilClass

this is my code:

show.html.erb:

...
  <%= simple_form_for :notes, :html => { :class => 'form-horizontal' } do |note| %>
    <%= render 'note_fields', :f => note %>
  <% end %>
  <%= link_to_add_association 'Aggiungi Nota', f, :notes, :render_options => {:wrapper => 'inline' } %>
...

_note_fields.html.erb:

...
<div class="nested-fields">
<%= f.input :body %>
<%= link_to_remove_association "Elimina Nota", f %>
</div>
...

Company.rb:

  ...
    has_many :notes
    accepts_nested_attributes_for :notes, :reject_if => :all_blank, :allow_destroy => true
  ...

Note.rb

class Note < ActiveRecord::Base
     attr_accessible :body, :company_id
     belongs_to :company
end

company_controller.rb

  def show
    @company = Company.includes(:category, :clients, :notes).find(params[:id])

    @mapCompany = Company.find(params[:id]).to_gmaps4rails

    respond_to do |format|
     format.html # show.html.erb
     format.json { render json: @company }
    end
  end

thanks! Dave

Answer 1

In the following code, the f variable was never defined.

<%= link_to_add_association 'Aggiungi Nota', f, :notes, :render_options => {:wrapper => 'inline' } %>

Try using company instead of f.