Rails - Jan 2006 - Altering the accessor of an association collection

I want to be able to do something like this (for example):

class Person < ActiveRecord::Base
  has_many :friends

  def friends(living_in = :uk)
    # filter based on parameters here
  end
end

Is there any way I can redefine the accessor for an association whilst 
still being able to get the values? Basically, I''m looking for an 
equivilent of read_attribute() for associations.

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

Actually don''t worry about this, I changed my code so I don''t
need it.

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On 2.1.2006, at 14.24, Jon Leighton wrote:
> I want to be able to do something like this (for example):
>
> class Person < ActiveRecord::Base
>   has_many :friends
>
>   def friends(living_in = :uk)
>     # filter based on parameters here
>   end
You can use the automatic Active Record methods for this, too:

jake = Person.find :first
jake.friends.find_all_by_living_in("uk")

If you think it''s worth it, you can also write your own friends  
method. I can''t really see a reason for that, though. Maybe I  
misunderstood something.

//jarkko
> end
>
> Is there any way I can redefine the accessor for an association whilst
> still being able to get the values? Basically, I''m looking for an
> equivilent of read_attribute() for associations.
>
> -- 
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
--
Jarkko Laine
http://jlaine.net
http://odesign.fi

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Jarkko Laine wrote:
> On 2.1.2006, at 14.24, Jon Leighton wrote:
> 
>> I want to be able to do something like this (for example):
>>
>> class Person < ActiveRecord::Base
>>   has_many :friends
>>
>>   def friends(living_in = :uk)
>>     # filter based on parameters here
>>   end
> 
> You can use the automatic Active Record methods for this, too:
> 
> jake = Person.find :first
> jake.friends.find_all_by_living_in("uk")
> 
> If you think it''s worth it, you can also write your own friends
> method. I can''t really see a reason for that, though. Maybe I
> misunderstood something.
Perhaps my example wasn''t the best -- it''s actually just a
simplified
example of something I''m doing which isn''t anything to do with
People or
Friends.

Basically I have a recursive object which makes up a tree of nodes -- 
imagine friends being of class Person as well (so I guess it would have 
been better to say "has_many :people" or something). Sometimes I would
want friends and its all descendants; sometimes I just want friends; and 
sometimes I want friends, and descendants, excluding where a boolean 
attribute is true.

Anyway, thanks for the info; I hadn''t thought of calling finders on a 
collection like that, but I''ve found an adaquate way to solve the 
problem.

Cheers

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