Rails 4.0 with Devise. Nested attributes Unpermited parameters

Question

I am working on a web-app using Devise and Rails 4. I have a User model which I have extended with 2 extra form fields such that when a user signs up he can also submit his first/last names. (based on http://blog.12spokes.com/web-design-development/adding-custom-fields-to-your-devise-user-model-in-rails-4/). I now want to add a Institution model. This model has_many :users, and a user belongs_to :institution. I want to be able to register the institution's name on the same form I register the user. I know I need a nested_attribute in my Institution model, since this is the parent, which I will show in a bit. When I try to sign up the user I get in the console: Unpermited parameters: Institutions.

My hint is that I cannot update my parent class(Institution) based upon my child class (User). Might there be a solution to this? Or has anyone experienced something similar?

class Institutions < ActiveRecord::Base
    has_many :users, 
    accepts_nested_attributes_for :users
end

class User < ActiveRecord::Base
     devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable
     belongs_to :institution
end

registrations/new.html.erb Here I have the nested form

<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f|     %>
<%= devise_error_messages! %>
.
. 
    <%= f.fields_for :institutions do |i| %>
        <p><%= i.label :name %><br />
        <%= i.text_field :institutions_attr %></p>
    <% end %>

Based on the tutorial I have linked earlier, I have created a new User::ParameterSanitizer which inherits from the Devise::ParameterSanitizer and overridden the sign_up method as follows:

lib/user_sanitizer.rb

private
def sign_up
    default_params.permit(:first_name, :last_name ,:email, :password,  :password_confirmation, :current_password, institutions_attributes: [:id, :name])
end

Finally, my application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception

  protected
  def devise_parameter_sanitizer
    if resource_class == User
    User::ParameterSanitizer.new(User, :user, params)
    else 
    super
    end
  end
end

Thank you for reading!

Console params output:

{"utf8"=>"✓",
 "authenticity_token"=>"JKuN6K5l0iwFsj/25B7GKDj7WEHR4DO3oaVyGxGJKvU=",
 "user"=>{"email"=>"[email protected]",
 "first_name"=>"abc",
 "last_name"=>"xyz",
 "institutions"=>{"name"=>"Government"},
 "password"=>"[FILTERED]",
 "password_confirmation"=>"[FILTERED]"},
 "commit"=>"Sign up"}

EDIT

As suggested, I have added

params.require(resource_name).permit( :email, :first_name, :last_name, institution:  [:name], :password, :password_confirmation ) and I get an *error syntax error, unexpected ',', expecting => ...nstitution: [:name], :password, :password_confirmation )*

BUT, if I re-edit to

params.require(resource_name).permit( :email, :first_name, :last_name, :password, :password_confirmation, institution:  [:name] ) 

I get NO syntax error but I get Unpermited parameters: Institutions in the Request.

My belief is that this happens because User is a child of Institution. I have, however, been unable to find a work-around this.

Answer 1

config/routes.rb

Create your own registration controller like so ... (see Devise documentation for the details of overriding controllers here ...) ... which is more elegant way as opposed to doing it via the ApplicationController

devise_for :users, controllers: {registrations: 'users/registrations'}

app/controllers/users/registrations_controller.rb

Override the new method to create a Profile associated with the User model as below ... run the configure_permitted_parameters method before to sanitize the parameters (note how to add nested parameters)

class Users::RegistrationsController < Devise::RegistrationsController

  before_filter :configure_permitted_parameters

  # GET /users/sign_up
  def new

    # Override Devise default behaviour and create a profile as well
    build_resource({})
    resource.build_profile
    respond_with self.resource
  end

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.for(:sign_up) { |u|
      u.permit(:email, :password, :password_confirmation, :profile_attributes => :fullname)
    }
  end
end

db/migrate/xxxxxxxxxxxxxx_create_profiles.rb

This is the migration that generates the Profile model (note the reference to User) ... this example profile only keeps fullname as an extension of the User but feel free to add as you wish!

class CreateProfiles < ActiveRecord::Migration
  def change
    create_table :profiles do |t|
       t.references :user
       t.string :fullname
       t.timestamps
    end
  end
end

app/models/user.rb

class User < ActiveRecord::Base

  # Associations
  has_one :profile, dependent: :destroy, autosave: true

  # Allow saving of attributes on associated records through the parent,
  # :autosave option is automatically enabled on every association
  accepts_nested_attributes_for :profile

  # Devise
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
end

app/models/profile.rb

class Profile < ActiveRecord::Base

  # Associations
  belongs_to :user

  # Validations
  validates :fullname, presence: true
end

app/views/devise/registrations/new.html

<% resource.build_profile if resource.profile.nil? %>
<%= form_for(resource, :as => resource_name,
                       :url => registration_path(resource_name)) do |f| %>
  <ul>

    <%= devise_error_messages! %>

    <li class="fullname">
      <%= f.fields_for :profile do |profile_fields| %>
        <%= profile_fields.label :fullname %>
        <%= profile_fields.text_field :fullname %>
      <% end %>
    </li>
    <li class="email">
      <%= f.label :email %>
      <%= f.email_field :email, :autofocus => true %>
    </li>
    <li class="password">
      <%= f.label :password %>
      <%= f.password_field :password %>
    </li>
    <li class="password">
      <%= f.label :password_confirmation %>
      <%= f.password_field :password_confirmation %>
    </li>
    <li>
      <%= f.submit %>
    </li>
    <li>
      <p><%= render "devise/shared/links" %></p>
    </li>
  </ul>
<% end %>