Rails - Nov 2008 - bizarre ruby debug behaviour when using variables beginning with character 'u' on windows

I''m using Instant Rails on windows. I''m also using ruby debug.

I first stumbled across the problem when an array that I named
utilities_used = [] was misbehaving. I added some experimental code
and set a breakpoint and started to investigate.

Here''s my code (it''s inside a model file):

foo = []
ufoo = []
vfoo = []
utfoo = []
utifoo = []
utils = []
utils_foo = []
foo_used = []
utils_used = []
missing_vehicles = []

debugger

When I break into the debugger:
(rdb:94) foo
[ ]
(rdb:94) vfoo
[ ]
(rdb:94) foo_used
[ ]
(rdb:94) missing_vehicles
[ ]
(rdb:94) ufoo
#1 E:/InstantRails-2.0-win/rails_apps/Carbon Salon Source Tree/app/
controllers/admin_controller.rb:37 in ''receive_file''
(rdb:94) foo
NameError Exception: undefined local variable or method `foo'' for
#<AdminController:0x46b45b4>
(rdb:94) vfoo
NameError Exception: undefined local variable or method `vfoo'' for
#<AdminController:0x46b45b4>
(rdb:94) foo_used
NameError Exception: undefined local variable or method `foo_used'' for
#<AdminController:0x46b45b4>
(rdb:94) missing_vehicles
NameError Exception: undefined local variable or method
`missing_vehicles'' for #<AdminController:0x46b45b4>

Note that, as soon as I inspect an array who''s name starts with the
letter ''u'', everything goes to pot...

I tinkered with this some more:
Code:
foo = [''a'', ''b'', ''c'']
ufoo = [''d'', ''e'', ''f'']
missing_vehicles = []

foo.each {|f| puts f}
ufoo.each {|u| puts u}

Console output:
Processing AdminController#receive_file (for 127.0.0.1 at 2008-11-10
16:58:09) [POST]
  Session ID: 858773c8b3335d4c6e9a1326e17c7cd0
  Parameters:
{"user_data_file"=>#<ActionController::UploadedStringIO:
0x42920a8>, "action"=>"receive_file",
"authenticity_token"=>"8
ce751d807f83817a140eb1cc4e463cc8f5b20f0",
"controller"=>"admin"}
a
b
c
d
e
f
E:/InstantRails-2.0-win/rails_apps/Carbon Salon Source Tree/app/models/
user_data_file.rb:95 #end

so - the code itself seems to work, back to the debugger:

(rdb:98) foo
["a", "b", "c"]
(rdb:98) ufoo
#1 E:/InstantRails-2.0-win/rails_apps/Carbon Salon Source Tree/app/
controllers/admin_controller.rb:37 in ''receive_file''
(rdb:98) foo
NameError Exception: undefined local variable or method `foo'' for
#<AdminController:0x426b46c>
(rdb:98)

So - it seems to be a problem with the debugger, rather than with
ruby. In fact, now that I think of it, i''ve repeatedly experienced
bizarre behaviour when using the debugger to inspect variables that
begin with the letter ''u''. Anybody else seen this?

I''m new to RoR, so - maybe i''m doing something stupid here...
any
input, enlightenment would be very much appreciated.

Yoram

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On 11 Nov 2008, at 01:04, ybernet-uAjRD0nVeow@public.gmane.org wrote:
>
> I''m using Instant Rails on windows. I''m also using ruby
debug.
>
> I first stumbled across the problem when an array that I named
> utilities_used = [] was misbehaving. I added some experimental code
> and set a breakpoint and started to investigate.
>
> Here''s my code (it''s inside a model file):
>
> foo = []
> ufoo = []
> vfoo = []
> utfoo = []
> utifoo = []
> utils = []
> utils_foo = []
> foo_used = []
> utils_used = []
> missing_vehicles = []
>
> debugger
>
> When I break into the debugger:
> (rdb:94) foo
> [ ]
> (rdb:94) vfoo
> [ ]
> (rdb:94) foo_used
> [ ]
> (rdb:94) missing_vehicles
> [ ]
> (rdb:94) ufoo
> #1 E:/InstantRails-2.0-win/rails_apps/Carbon Salon Source Tree/app/
> controllers/admin_controller.rb:37 in ''receive_file''
Looks like ruby debug sees the u and handles it like the u command  
(which means move up the stack frame, pushing all your local variables  
out of scope). I''m surprised any of this works - normally to evaluate  
an expression you need to use the e command ie
e foo

Fred
>
> (rdb:94) foo
> NameError Exception: undefined local variable or method `foo'' for
> #<AdminController:0x46b45b4>
> (rdb:94) vfoo
> NameError Exception: undefined local variable or method `vfoo'' for
> #<AdminController:0x46b45b4>
> (rdb:94) foo_used
> NameError Exception: undefined local variable or method `foo_used''
for
> #<AdminController:0x46b45b4>
> (rdb:94) missing_vehicles
> NameError Exception: undefined local variable or method
> `missing_vehicles'' for #<AdminController:0x46b45b4>
>
> Note that, as soon as I inspect an array who''s name starts with
the
> letter ''u'', everything goes to pot...
>
> I tinkered with this some more:
> Code:
> foo = [''a'', ''b'', ''c'']
> ufoo = [''d'', ''e'',
''f'']
> missing_vehicles = []
>
> foo.each {|f| puts f}
> ufoo.each {|u| puts u}
>
> Console output:
> Processing AdminController#receive_file (for 127.0.0.1 at 2008-11-10
> 16:58:09) [POST]
>  Session ID: 858773c8b3335d4c6e9a1326e17c7cd0
>  Parameters:
{"user_data_file"=>#<ActionController::UploadedStringIO:
> 0x42920a8>, "action"=>"receive_file",
"authenticity_token"=>"8
> ce751d807f83817a140eb1cc4e463cc8f5b20f0",
"controller"=>"admin"}
> a
> b
> c
> d
> e
> f
> E:/InstantRails-2.0-win/rails_apps/Carbon Salon Source Tree/app/ 
> models/
> user_data_file.rb:95 #end
>
> so - the code itself seems to work, back to the debugger:
>
> (rdb:98) foo
> ["a", "b", "c"]
> (rdb:98) ufoo
> #1 E:/InstantRails-2.0-win/rails_apps/Carbon Salon Source Tree/app/
> controllers/admin_controller.rb:37 in ''receive_file''
> (rdb:98) foo
> NameError Exception: undefined local variable or method `foo'' for
> #<AdminController:0x426b46c>
> (rdb:98)
>
> So - it seems to be a problem with the debugger, rather than with
> ruby. In fact, now that I think of it, i''ve repeatedly experienced
> bizarre behaviour when using the debugger to inspect variables that
> begin with the letter ''u''. Anybody else seen this?
>
> I''m new to RoR, so - maybe i''m doing something stupid
here... any
> input, enlightenment would be very much appreciated.
>
> Yoram
>
> >

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