Rails - Sep 2006 - Model Without Associated Table

I have a tag cloud that is made up of Tags(model with table).  I want
the tag cloud to be a model but I do not need a table since I am going
to get the data from Tag.  I was wondering how do I create a model
that does not depend on a table?  Is this a bad practice?  Does anyone
see me doing it another way?  Thanks :-)

-- 
John Kopanas
john-Iau1QiYlxLpBDgjK7y7TUQ@public.gmane.org

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Not every model (or ruby class ) needs to relate to a table in the
database. Actually a given class only gets that functionality when it
inherits from ActiveRecord::Base.

class TagCloud
  ...
end

would work without any related table...

hope that helps.

-Sean


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Who would of thought.  For some odd reason I was under the impression
that if I took out ActiveRecord::Base then the framework would burn
into the ground... but it still works :-).

On 9/9/06, x1.sean-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
<x1.sean-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Not every model (or ruby class ) needs to relate to a table in the
> database. Actually a given class only gets that functionality when it
> inherits from ActiveRecord::Base.
>
> class TagCloud
>   ...
> end
>
> would work without any related table...
>
> hope that helps.
>
> -Sean
>
>
> >
>

-- 
John Kopanas
john-Iau1QiYlxLpBDgjK7y7TUQ@public.gmane.org

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On Sep 8, 2006, at 8:53 PM, John Kopanas wrote:
>
> I have a tag cloud that is made up of Tags(model with table).  I want
> the tag cloud to be a model but I do not need a table since I am going
> to get the data from Tag.  I was wondering how do I create a model
> that does not depend on a table?  Is this a bad practice?  Does anyone
> see me doing it another way?  Thanks :-)
>
> --  
> John Kopanas
> john-Iau1QiYlxLpBDgjK7y7TUQ@public.gmane.org

	In this case you may want to just make a plain old ruby class that  
doesn''t inherit from AR::Base, put it in your models dir and let it  
do whatever it wants to with the Tag model.


class TagCloud
   def self.[](num)
     Tag.find(:all, :limit => num) # or whatever, you get the idea.
   end
end

You would use this to output a cloud of 25 tags like so:

TagCloud[25]

	
	
	Or you can use some form of delegation to the Tag model. I use plain  
ruby models like this as sort of coordination-models that coordinate  
multiple ActiveRecord models but don''t need to keep their own state  
in the database. So these are good places for complex logic that  
deals with multiple AR models at once.

-Ezra

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