I've created this code to show specific errors messages to user:
application_controller.rb
class ApplicationController < ActionController::Base
rescue_from Exception do |exception|
message = exception.message
message = "default error message" if exception.message.nil?
render :text => message
end
end
room_controller.rb
class RoomController < ApplicationController
def show
@room = Room.find(params[:room_id]) # Can throw 'ActiveRecord::RecordNotFound'
end
def business_method
# something
raise ValidationErros::BusinessException("You cant do this") if something #message "You cant do this" should be shown for user
#...
end
def business_method_2
Room.find(params[:room_id]).do_something
end
end
room.rb
class Room < ActiveRecord::Base
def do_something
#...
raise ValidationErrors::BusinessException("Invalid state for room") if something #message "Invalid state for room" should be shown for user
#...
end
end
app/models/erros/validation_errors.rb
module ValidationErrors
class BusinessException < RuntimeError
attr :message
def initialize(message = nil)
@message = message
end
end
end
example.js
$.ajax({
url: '/room/show/' + roomId,
success: function(data){
//... do something with data
},
error: function(data){
App.notifyError(data) //show dialog with message
}
});
But I can not use the class BusinessException. When BusinessException should be raised, the message
uninitialized constant Room::ValidationErrors
is shown to user.
if I change this code:
raise ValidationErrors::BusinessException("Invalid state for room") if something
by this:
raise "Invalid state for room" if something
It works.
What change to this code works with BusinessException with messages. I need this
to create specifics rescue_from methods in ApplicationController.
Edit:
Thank you for comments! My error is it doesn't know ValidationErrors Module. How to import this Module to my class?
I've tested add theses lines to lines:
require 'app/models/errors/validation_errors.rb'
require 'app/models/errors/validation_errors'
But then raise the error:
cannot load such file -- app/models/errors/validation_errors
Solution:
https://stackoverflow.com/a/3356843/740394
config.autoload_paths += %W(#{config.root}/app/models/errors)
