Ruby on Rails

This is my code,

user controller 42:
@user = User.with_clients.with_projects.find(doorkeeper_token.resource_owner_id)

active support code that error out.

def define_callbacks(kind, object) #:nodoc:
name = _callback_runner_name(kind)
unless object.respond_to?(name, true)
  str = object.send("#{kind}_callbacks").compile
  class_eval <<-RUBY_EVAL, __FILE, LINE + 1
    def #{name}() #{str} end
    protected :#{name}
   RUBY_EVAL
  end
name
end

So some how active support try to eval a "def () value = nil" here. Which mean #{name} is empty?

I thought the code ...

object.respond_to?(name, true) is intended to prevent cases where name is empty or nil. But when the #{name} used in the class_eval came from _callback_runner_name(kind) and has nothing to do with object.name

So I am not sure if the code is checking the wrong thing when checking object.respond_to?(name, true)

And I dont know at what instance would _callback_runner_name(kind) returns empty for me. Any idea what these code was intended to do. In the case that _callback_runner_name(kind)  is returning empty, I am not sure how this will be my code causing the issue at the moment.

[363, 372] in /Users/~/.rbenv/versions/jruby-1.7.4/gemsets/ruby/gems/activesupport-4.0.0/lib/active_support/callbacks.rb

   363        # This method defines callback chain method for the given kind

   364        # if it was not yet defined.

   365        # This generated method plays caching role.

   366        def __define_callbacks(kind, object) #:nodoc:

   367   debugger       

=> 368   name = __callback_runner_name(kind)

   369          unless object.respond_to?(name, true)

   370            str = object.send("_#{kind}_callbacks").compile

   371            class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1

   372              def #{name}() #{str} end

/Users/~/.rbenv/versions/jruby-1.7.4/gemsets/ruby/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:368

name = __callback_runner_name(kind)

(rdb:1) name = __callback_runner_name(kind)

"_run__1313977386__find__callbacks"

(rdb:1) kind

:find

(rdb:1) str

nil

(rdb:1) object.send("_#{kind}_callbacks").compile

"value = nil\nhalted = false\nvalue = !halted && (!block_given? || yield)\nvalue"

(rdb:1) object

#<ClientMembership id: 1, client_id: 1, user_id: 1, is_client_admin: true, created_at: "2013-06-18 20:23:13", updated_at: "2013-06-18 20:23:13">

(rdb:1) object.name

"dev@email.com"

On Wednesday, 21 August 2013 16:51:11 UTC-4, ian...@jugnoo.com wrote:

In my server log, I am seeing this error message that is raised in activesupport. 

2013-08-12T23:06:08.932580+00:00 app[web.2]: SyntaxError (/app/vendor/bundle/jruby/1.9/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:374: syntax error, unexpected tRPAREN
2013-08-12T23:06:08.932580+00:00 app[web.2]:
2013-08-12T23:06:08.932580+00:00 app[web.2]: def () value = nil
2013-08-12T23:06:08.932580+00:00 app[web.2]: ^):
2013-08-12T23:06:08.932580+00:00 app[web.2]: app/controllers/api/users_controller.rb:42:in `show'

"def () value = nil" is not valid syntax. Wherever that is in your code, you need to fix it...

--Matt Jones