How do I raise an exception in Rails so it behaves like other Rails exceptions

Question

I would like to raise an exception so that it does the same thing a normal Rails exception does  Specially  show the exception and stack trace in development mode and show  We re sorry  but something went wrong  page in production mode    I tried the following   raise  safety care group missing   if group nil    But it simply writes  ERROR signing up  group missing   to the development log file

User · Answer

If you need an easier way to do it  and don t want much fuss  a simple execution could be   raise Exception new  something bad happened      This will raise an exception  say e with e message   something bad happened   and then you can rescue it as you are rescuing all other exceptions in general

User · Answer

You don t have to do anything special  it should just be working   When I have a fresh rails app with this controller   class FooController  lt  ApplicationController   def index     raise  error    end end   and go to http   127 0 0 1 3000 foo   I am seeing the exception with a stack trace   You might not see the whole stacktrace in the console log because Rails  since 2 3  filters lines from the stack trace that come from the framework itself   See config initializers backtrace silencers rb in your Rails project

User · Answer

You can do it like this   class UsersController  lt  ApplicationController      Exception Handling   class NotActivated  lt  StandardError   end    rescue from NotActivated   with   gt   not activated    def not activated exception      flash  notice     This user is not activated       Event new event  Exception    exception message    current user  request remote ip     redirect to       end    def show          Do something that fails         raise NotActivated unless  user is activated    end end   What you re doing here is creating a class  NotActivated  that will serve as Exception  Using raise  you can throw  NotActivated  as an Exception  rescue from is the way of catching an Exception with a specified method  not activated in this case   Quite a long example  but it should show you how it works   Best wishes  Fabian

[ruby-on-rails] How do I raise an exception in Rails so it behaves like other Rails exceptions?

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