Rails - Jun 2006 - Relationship and reflection

Hello,

I have a question.
I would like to know if there is a way with the reflection and 
respond_to? to know if there is a relationship between tables.

When I say that I mean if inside a model there is a Has_many or 
belongs_to declaration. Because I try to get this information 
dynamically, during the execution of a script.

If someone has an idea even if it''s not with the reflection, because 
this way seemed for me a good one but maybe I''m wrong, and another can 
do it.

Thanks for your help.

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

Guillaume wrote:
> I would like to know if there is a way with the reflection and 
> respond_to? to know if there is a relationship between tables.
> 
> When I say that I mean if inside a model there is a Has_many or 
> belongs_to declaration. Because I try to get this information 
> dynamically, during the execution of a script.
> 
> If someone has an idea even if it''s not with the reflection,
because
> this way seemed for me a good one but maybe I''m wrong, and another
can
> do it.
If you want to find associations from Person to Car, try this:

Person.reflect_on_all_associations.select { |r| r.klass == Car }

--
Josh Susser
http://blog.hasmanythrough.com

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

Josh Susser wrote:
> Guillaume wrote:
>> I would like to know if there is a way with the reflection and 
>> respond_to? to know if there is a relationship between tables.
>> 
>> When I say that I mean if inside a model there is a Has_many or 
>> belongs_to declaration. Because I try to get this information 
>> dynamically, during the execution of a script.
>> 
>> If someone has an idea even if it''s not with the reflection,
because
>> this way seemed for me a good one but maybe I''m wrong, and
another can
>> do it.
> 
> If you want to find associations from Person to Car, try this:
> 
> Person.reflect_on_all_associations.select { |r| r.klass == Car }
> 
> --
> Josh Susser
> http://blog.hasmanythrough.com
That''s works very well.
Thanks a lot for your quick help, that''s really helped me, I''m
so happy.

Thank you very much again.

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

Hello,

I''m using a code similar to the previous one, slightly modified, like 
that:

Person.reflect_on_all_associations.select { |r| @person.r.name.save }
where r.name = cars

When I''m using that code I expect ruby to interpret
@person.r.name.save to @person.cars.save, but it doesn''t.

I even tried @person.#{r.name}.save, but with that ''#'' all my
code fall
apart. I even try to concatenate with ''+'' but nothing worka.

I don''t know how to make Ruby understand that I want to use the value 
inside r.name.

If someone has an idea, please I need your help.


Thank you very much.

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