Rails - Sep 2013 - Rails 4 - undefined method build in using strong parameters

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

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On 17 September 2013 18:27, Erwin
<yves_dufour-ee4meeAH724@public.gmane.org> 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

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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)


Le mardi 17 septembre 2013 19:31:43 UTC+2, Colin Law a écrit
:
>
> On 17 September 2013 18:27, Erwin <yves_...-ee4meeAH724@public.gmane.org
<javascript:>> 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 
>
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