Rails - Apr 2007 - indentifier needs to be constant error when calling Struct.new

In my current rails application, I now have the following issue:

script/console
Loading development environment.
 >> bob = Struct.new(:anysymbol)
NameError: identifier anysymbol needs to be constant
         from (irb):1:in `new''
         from (irb):1
 >> exit


This occurs regardless of what symbols are passed to Struct.new call.

Consequently, nothing that uses Struct will work anymore. I  
discovered this when attempting to use Fastercsv, which fails when  
required.



I''m completely mystified by this error and have little idea how to go  
about tracking down what is causing it, short of rebuilding my  
application one step at a time. It''s fairly big to be doing with at  
this point.

What could cause such a problem?

I''ve made no monkeypatches to Struct. I can''t find any code
messing
with Struct among the plugins I''ve installed.


Help.

Michael Johnston




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whew. I managed to discover this relatively quickly once I quelled my  
panic.

It was caused by an extension called acts_as_wizard, which  
monkeypatches Symbol thusly:

class Symbol
...some other monkeycrap^H^H^H^Hpatching
   def to_str
     id2name
   end
end

I''m not entirely sure how this ends up breaking Struct.new, but it  
does. It''s a lame patch anyway, he should just use id2name or "# 
{mysymbol}" instead of making such a patch. Coercions and other such  
things that are likely to be pervasively used outside of the code you  
are writing are bad bad targets for monkeypatching.

Since the time I installed acts_as_wizard, I have stopped using it  
and written my own wizard management code, so luckily I can easily  
just pitch this plugin.

Michael Johnston

On 4-Apr-07, at 9:24 AM, Michael Johnston wrote:
>
> In my current rails application, I now have the following issue:
>
> script/console
> Loading development environment.
>>> bob = Struct.new(:anysymbol)
> NameError: identifier anysymbol needs to be constant
>          from (irb):1:in `new''
>          from (irb):1
>>> exit
>
>
> This occurs regardless of what symbols are passed to Struct.new call.
>
> Consequently, nothing that uses Struct will work anymore. I
> discovered this when attempting to use Fastercsv, which fails when
> required.
>
>
>
> I''m completely mystified by this error and have little idea how to
go
> about tracking down what is causing it, short of rebuilding my
> application one step at a time. It''s fairly big to be doing with
at
> this point.
>
> What could cause such a problem?
>
> I''ve made no monkeypatches to Struct. I can''t find any
code messing
> with Struct among the plugins I''ve installed.
>
>
> Help.
>
> Michael Johnston
>
>
>
>
> >

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Hey thanks for this info, I''ve been having the same problems with 
net/sftp and net/imap and could not figure out the reason, turned out to 
be the act_as_wizard plugin!


Michael Johnston wrote:
> whew. I managed to discover this relatively quickly once I quelled my
> panic.
> 
> It was caused by an extension called acts_as_wizard, which
> monkeypatches Symbol thusly:
> 
> class Symbol
> ...some other monkeycrap^H^H^H^Hpatching
>    def to_str
>      id2name
>    end
> end
> 
> I''m not entirely sure how this ends up breaking Struct.new, but it
> does. It''s a lame patch anyway, he should just use id2name or
"#
> {mysymbol}" instead of making such a patch. Coercions and other such
> things that are likely to be pervasively used outside of the code you
> are writing are bad bad targets for monkeypatching.
> 
> Since the time I installed acts_as_wizard, I have stopped using it
> and written my own wizard management code, so luckily I can easily
> just pitch this plugin.
> 
> Michael Johnston
-- 
Posted via http://www.ruby-forum.com/.

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