Rails - May 2008 - undefined method `table_name' for REXML::Comment:Class

Hi,

I just got into polymorphic relations. It works very nice, but I ran
into a strange problem that can be reproduced easily. I don''t have
another workaround than to uncomment an include, but thats lame. Here it
is:

# My models

# a generic comment class (it has a name and message)
class Comment < ActiveRecord::Base
  belongs_to :commentable, :polymorphic => true
end

# another model that has comments
class Batch < ActiveRecord::Base
  has_many :comments, :as => :commentable
end


Now start a rails console and be amazed by the following:

C:\rails\atlas>ruby script\console
Loading development environment (Rails 2.0.1)
>> include REXML
=> Object
>> Batch.find(:first).comments
NoMethodError: undefined method `table_name'' for REXML::Comment:Class
(more error lines follow here)

It looks like REXML gets in the way of my real comments here. What can I
do to prevent this?

regards, Johan van der Kuijl
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On 13 May 2008, at 17:13, Johan Van der kuijl wrote:
>
> Hi,
>
> I just got into polymorphic relations. It works very nice, but I ran
> into a strange problem that can be reproduced easily. I don''t have
> another workaround than to uncomment an include, but thats lame.  
> Here it
> is:
>
> # My models
>
> # a generic comment class (it has a name and message)
> class Comment < ActiveRecord::Base
>  belongs_to :commentable, :polymorphic => true
> end
>
> # another model that has comments
> class Batch < ActiveRecord::Base
>  has_many :comments, :as => :commentable
> end
>
>
> Now start a rails console and be amazed by the following:
>
> C:\rails\atlas>ruby script\console
> Loading development environment (Rails 2.0.1)
>>> include REXML
> => Object
>>> Batch.find(:first).comments
> NoMethodError: undefined method `table_name'' for
REXML::Comment:Class
> (more error lines follow here)
>
> It looks like REXML gets in the way of my real comments here. What  
> can I
> do to prevent this?
Don''t include REXML? What you''ve done there is make all of
REXML''s
constants available at the top level, including Comment. You could try  
requiring your comment model first.

Fred
>
>
> regards, Johan van der Kuijl
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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Frederick Cheung wrote:
> On 13 May 2008, at 17:13, Johan Van der kuijl wrote:
> 
>>
>>
>> It looks like REXML gets in the way of my real comments here. What  
>> can I
>> do to prevent this?
> 
> Don''t include REXML? What you''ve done there is make all
of REXML''s
> constants available at the top level, including Comment. You could try
> requiring your comment model first.
> 
> Fred
Thx Fred, you pointed me in the right direction.

I fixed it by commenting out the top level include of REXML, and adding 
a REXML:: prefix where neccesary, like:

newdoc = REXML::Document.new()

Johan

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