Devise y default_scope en modelo User

Some Devise actions fail if default_Scope is used i User model. For instance, the authentication fails even user and password are correct.

Create module like this

module DeviseOverrides  
  def find_for_authentication(conditions) 
    unscoped { super(conditions) }
  end

  def serialize_from_session(key, salt)
    unscoped { super(key, salt) }
  end

  def send_reset_password_instructions(attributes={})
    unscoped { super(attributes) }
  end

  def reset_password_by_token(attributes={})
    unscoped { super(attributes) }
  end

  def find_recoverable_or_initialize_with_errors(required_attributes, attributes, error=:invalid)
    unscoped { super(required_attributes, attributes, error) }
  end

  def send_confirmation_instructions(attributes={})
    unscoped { super(attributes) }
  end

  def confirm_by_token(confirmation_token)
    unscoped { super(confirmation_token) }
  end
end

Extend User model

class User < ActiveRecord::Base  
  # Include default devise modules. Others available are:
  # :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable,
         :confirmable, :lockable

  extend DeviseOverrides       

  default_scope -> { where(is_admin: false) }

  ...

end

Devise and user default scope

Devise y default_scope en modelo User