Rails 4 - undefined method build in using strong parameters

[Erwin]

In my backoffice/users_controller.rb , I wrote a class to build the permitted parameters

class Backoffice::UsersController < ApplicationController

    class UserParams
        def build params
            params.require(:user).permit(:email, :password, :password_confirmation )
        end
      end

but using it in the create method,
  def create
    @user = User.new(UserParams.build(params))

 I get an error : 

undefined method `build' for Backoffice::UsersController::UserParams:Class

 I guess I am wrong somewhere as the class is defined in the Backoffice module... where I am wrong ?

thanks for help

[Colin Law]

On 17 September 2013 18:27, Erwin <yves_...@mac.com> wrote:
> In my backoffice/users_controller.rb , I wrote a class to build the
> permitted parameters
>
> class Backoffice::UsersController < ApplicationController
>
> class UserParams
> def build params

If you want a class method (rather than instance) this should be
def self.build( params )

> params.require(:user).permit(:email, :password,
> :password_confirmation )
> end
> end
>
> but using it in the create method,
> def create
> @user = User.new(UserParams.build(params))
>
> I get an error :
>
> undefined method `build' for Backoffice::UsersController::UserParams:Class

Because you have defined an instance method not a class method

Colin

[Erwin]

Thanks Colin...  changed to :

  private
 
  def user_params

      params.require(:user).permit(:email, :password, :password_confirmation )
  end

and cretae /update...
  def create
    @user = User.new(user_params)