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module CanCan
# A general CanCan exception
class Error < StandardError; end
# Raised when behavior is not implemented, usually used in an abstract class.
class NotImplemented < Error; end
# Raised when removed code is called, an alternative solution is provided in message.
class ImplementationRemoved < Error; end
# Raised when using check_authorization without calling authorized!
class AuthorizationNotPerformed < Error; end
# This error is raised when a user isn't allowed to access a given controller action.
# This usually happens within a call to ControllerAdditions#authorize! but can be
# raised manually.
#
# raise CanCan::AccessDenied.new("Not authorized!", :read, Article)
#
# The passed message, action, and subject are optional and can later be retrieved when
# rescuing from the exception.
#
# exception.message # => "Not authorized!"
# exception.action # => :read
# exception.subject # => Article
#
# If the message is not specified (or is nil) it will default to "You are not authorized
# to access this page." This default can be overridden by setting default_message.
#
# exception.default_message = "Default error message"
# exception.message # => "Default error message"
#
# See ControllerAdditions#authorized! for more information on rescuing from this exception
# and customizing the message using I18n.
class AccessDenied < Error
attr_reader :action, :subject
attr_writer :default_message
def initialize(message = nil, action = nil, subject = nil)
@message = message
@action = action
@subject = subject
@default_message = "You are not authorized to access this page."
end
def to_s
@message || @default_message
end
end
end
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