ActiveModel::ForbiddenAttributesError when creating new user

ActiveModel::ForbiddenAttributesError when creating new user

Solution:

On your POST handler, you need to untaint your params with:

class UsersController < ApplicationController
 (...) 
 def create #post
   @user = User.new(user_params)
   (...)
 end
 (...)
 private def user_params
   params.require(:user).permit(:username, :email, :password, :salt, :encrypted_password)
 end
end