Rails - Jan 2007 - Troubleshooting "can't modify frozen object" in tzinfo_timezone

Hi. Off and on I get a "can''t modify frozen object" when
working with
the tzinfo_timezone plugin. I''ve added some debugging in the code to 
try and track down what goes wrong:

  def tzinfo
    RAILS_DEFAULT_LOGGER.debug("TZINFO STATE ''#{@tzinfo}''
class
#{@tzinfo.class} frozen? #{@tzinfo.frozen?}")
    return @tzinfo if @tzinfo
    RAILS_DEFAULT_LOGGER.debug("TZINFO ASSIGN TO #{MAPPING[name]}")
    begin
      @tzinfo = MAPPING[name]
    rescue TypeError => type_error
      RAILS_DEFAULT_LOGGER.debug("TZINFO TYPE ERROR #{type_error}")
      raise type_error
    end
    RAILS_DEFAULT_LOGGER.debug("TZINFO ASSIGNED TO #{@tzinfo}")
    if String === @tzinfo
      @tzinfo = TZInfo::Timezone.get(@tzinfo)
      MAPPING[name] = @tzinfo
    end
    @tzinfo
  end


When the error occurs, the following makes it to the log:

TZINFO STATE '''' class NilClass frozen? false
TZINFO ASSIGN TO Europe/Amsterdam
TZINFO TYPE ERROR can''t modify frozen object

Which means, that @tzinfo is nil, and yet, the line

    @tzinfo = MAPPING[name]

Causes a TypeError. MAPPING is a hash. I''m mildly confused. Anyone 
able to shed some light on what might be the issue or how to dig 
further into the problem?

ruby 1.8.4 (2005-12-24) [x86_64-linux]

Thanks.

Morten


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On 1/30/07, Morten <usenet-Mr43XxmkdKzQT0dZR+AlfA@public.gmane.org>
wrote:
>
> Hi. Off and on I get a "can''t modify frozen object" when
working with
> the tzinfo_timezone plugin. I''ve added some debugging in the code
to
> try and track down what goes wrong:
>
>   def tzinfo
>     RAILS_DEFAULT_LOGGER.debug("TZINFO STATE
''#{@tzinfo}'' class
> #{@tzinfo.class} frozen? #{@tzinfo.frozen?}")
>     return @tzinfo if @tzinfo
>     RAILS_DEFAULT_LOGGER.debug("TZINFO ASSIGN TO
#{MAPPING[name]}")
>     begin
>       @tzinfo = MAPPING[name]
>     rescue TypeError => type_error
>       RAILS_DEFAULT_LOGGER.debug("TZINFO TYPE ERROR
#{type_error}")
>       raise type_error
>     end
>     RAILS_DEFAULT_LOGGER.debug("TZINFO ASSIGNED TO #{@tzinfo}")
>     if String === @tzinfo
>       @tzinfo = TZInfo::Timezone.get(@tzinfo)
>       MAPPING[name] = @tzinfo
>     end
>     @tzinfo
>   end
>
>
> When the error occurs, the following makes it to the log:
>
> TZINFO STATE '''' class NilClass frozen? false
> TZINFO ASSIGN TO Europe/Amsterdam
> TZINFO TYPE ERROR can''t modify frozen object
>
> Which means, that @tzinfo is nil, and yet, the line
>
>     @tzinfo = MAPPING[name]
>
> Causes a TypeError. MAPPING is a hash. I''m mildly confused. Anyone
> able to shed some light on what might be the issue or how to dig
> further into the problem?
>
> ruby 1.8.4 (2005-12-24) [x86_64-linux]
>
> Thanks.
>
> Morten
>
>
> >
>
Morten,

Not sure what''s causing this exactly.  Why are you trying to load the
tzinfo from a MAPPING hash?

Check out the timezone code in mephisto for a really slick way to
handle timezones.  It helped me quite a bit.

Hope this helps.

--
Zack Chandler
http://depixelate.com

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Zack,
> Morten,
>
> Not sure what''s causing this exactly.  Why are you trying to load
the
> tzinfo from a MAPPING hash?
The code I''m trying to debug is actually tzinfo_timezone.rb, so the
error occurs within the plugin. I just use it like:

In my user model:

  composed_of :tz, :class_name => ''TimeZone'', :mapping
=> %w(time_zone
name)

In my view:

  <%= format_date(@current_user.tz.utc_to_local(entry.created_at)) %>

The hash is part of tzinfo_timezone.rb''s way of associating time zones
with locations.

Thanks for the tip on Mephisto, I''ll look into their way og handling
time zones.

Br,

Morten



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On 1/31/07, Morten <usenet-Mr43XxmkdKzQT0dZR+AlfA@public.gmane.org>
wrote:
>
>
> Zack,
>
> > Morten,
> >
> > Not sure what''s causing this exactly.  Why are you trying to
load the
> > tzinfo from a MAPPING hash?
>
> The code I''m trying to debug is actually tzinfo_timezone.rb, so
the
> error occurs within the plugin. I just use it like:
>
> In my user model:
>
>   composed_of :tz, :class_name => ''TimeZone'', :mapping
=> %w(time_zone
> name)
>
> In my view:
>
>   <%= format_date(@current_user.tz.utc_to_local(entry.created_at)) %>
>
> The hash is part of tzinfo_timezone.rb''s way of associating time
zones
> with locations.
>
> Thanks for the tip on Mephisto, I''ll look into their way og
handling
> time zones.
This line should be:

composed_of :tz, :class_name => ''TzinfoTimezone'', :mapping
=> %w(time_zone name)

I think the mappings are slightly different between the two which
would explain the intermittent crashes.

--
Zack Chandler
http://depixelate.com

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The tzinfo_timezone plugin, in the init.rb script, actually replaces
Rails'' TimeZone class with TzinfoTimezone, so using either one of
those should work as the :class_name (I think?),

-tieg

On Jan 31, 10:44 am, "Zack Chandler"
<zackchand...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 1/31/07, Morten <use...-Mr43XxmkdKzQT0dZR+AlfA@public.gmane.org>
wrote:
>
>
>
>
>
> > Zack,
>
> > > Morten,
>
> > > Not sure what''s causing this exactly.  Why are you
trying to load the
> > > tzinfo from a MAPPING hash?
>
> > The code I''m trying to debug is actually tzinfo_timezone.rb,
so the
> > error occurs within the plugin. I just use it like:
>
> > In my user model:
>
> >   composed_of :tz, :class_name => ''TimeZone'',
:mapping => %w(time_zone
> > name)
>
> > In my view:
>
> >   <%= format_date(@current_user.tz.utc_to_local(entry.created_at))
%>
>
> > The hash is part of tzinfo_timezone.rb''s way of associating
time zones
> > with locations.
>
> > Thanks for the tip on Mephisto, I''ll look into their way og
handling
> > time zones.
>
> This line should be:
>
> composed_of :tz, :class_name => ''TzinfoTimezone'',
:mapping => %w(time_zone name)
>
> I think the mappings are slightly different between the two which
> would explain the intermittent crashes.
>
> --
> Zack Chandlerhttp://depixelate.com

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Morten wrote:
> Hi. Off and on I get a "can''t modify frozen object" when
working with
> the tzinfo_timezone plugin. I''ve added some debugging in the code
to
> try and track down what goes wrong:
>
> .....
> 
> Thanks.
> 
> Morten
Has anybody figured out why this occurs and how to fix it?  It''s odd
that the error only occurs sporadically.

Thanks,
Andrew

-- 
Posted via http://www.ruby-forum.com/.

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