Question

I am new to RoR and I thought I could ask you some help. I didn’t find the specific answer I am looking for.

I have a problem with a modelisation I want to make using Devise. Devise sets up a Member model, and I want to have a SuperMember model which have more attributes than Member, and some different views.

I want to set up a nested form to create a SuperMember, while automatically creating the Member account in the background.

Member.rb (generated by devise)

class Member < ActiveRecord::Base
  devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable
  attr_accessible :email, :password, :password_confirmation, :remember_me
end

SuperMember.rb

class Supermember < ActiveRecord::Base
  attr_accessible :first_name, :last_name
  belongs_to :member, :dependent => :destroy
  accepts_nested_attributes_for :member
end

Supermembers.controllers.rb

def new
@supermember = Supermember.new
  @supermember.member = Supermember.build

  respond_to do |format|
    format.html # new.html.erb
    format.json { render json: @supermember }
  end
end

def create
  @supermember = Supermember.new(params[:supermember])

  respond_to do |format|
  if @supermember.save
    format.html { redirect_to @supermember, notice: 'Supermember was successfully created.' }
    format.json { render json: @supermember, status: :created, location: @supermember }
  else
    format.html { render action: "new" }
    format.json { render json: @supermember.errors, status: :unprocessable_entity }
  end
end

I tried to create a nested form in order to generate both the member and the supermember :

<%= simple_form_for(@supermember) do |f| %>
  <%= f.error_notification %>

  <div class="form-inputs">
    <%= f.input :first_name %>
    <%= f.input :last_name %>
  </div>

    <% # Devise member %>
    <%= f.fields_for :member do |m| %>
  <div class="form-inputs">
    <%= m.input :email, :required => true, :autofocus => true %>
    <%= m.input :password, :required => true %>
    <%= m.input :password_confirmation, :required => true %>
  </div>
    <% end %>

  <div class="form-actions">
    <%= f.button :submit %>
  </div>
<% end %>

The problem is that when I submit this form, I get the following error message :

Can't mass-assign protected attributes: member_attributes

Application Trace | Framework Trace | Full Trace
  app/controllers/supermembers.rb:44:in `new'
  app/controllers/supermembers.rb:44:in `create'

I really don’t understand how to fix it. Could you help me on this one?
Thank you very much!

Answer 1

You need to allow Supermember to accept mass assignment of the member attributes

class Supermember < ActiveRecord::Base
  attr_accessible :first_name, :last_name, :member_attributes
  ...
end