module ActiveSupport::Rescuable::ClassMethods

Exceptions raised inside exception handlers are not propagated up.

end
end
redirect_back_or_to root_url, alert: exception.record.errors.full_messages.to_sentence
def show_record_errors(exception)

end
head :forbidden
def deny_access
private

end
redirect_to root_url, alert: exception.message
rescue_from "MyApp::BaseError" do |exception|

rescue_from ActiveRecord::RecordInvalid, with: :show_record_errors
rescue_from User::NotAuthorized, with: :deny_access
class ApplicationController < ActionController::Base

any.
which exception.is_a?(klass) holds true is the one invoked, if
bottom to top, and up the hierarchy. The handler of the first class for
Handlers are inherited. They are searched from right to left, from

that the exception can be inspected when dealing with it.
Handlers that take one argument will be called with the exception, so

can be given as the handler.
option containing the name of a method or a Proc object. Alternatively, a block
names, and an exception handler specified by a trailing :with
rescue_from receives a series of exception classes or class

Registers exception classes with a handler to be called by rescue_with_handler.

def rescue_from(*klasses, with: nil, &block)
  unless with
    if block_given?
      with = block
    else
      raise ArgumentError, "Need a handler. Pass the with: keyword argument or provide a block."
    end
  end
  klasses.each do |klass|
    key = if klass.is_a?(Module) && klass.respond_to?(:===)
      klass.name
    elsif klass.is_a?(String)
      klass
    else
      raise ArgumentError, "#{klass.inspect} must be an Exception class or a String referencing an Exception class"
    end
    # Put the new handler at the end because the list is read in reverse.
    self.rescue_handlers += [[key, with]]
  end
end