Rails - Apr 2006 - Using Reflections to find out ActiveRecord class association

I want to find out what are the associations with another active record 
class. So If my class is as below:

  Class Component < ActiveRecord::Base
    has_many :branches
  end

  class Branch < ActiveRecord::Base
    belongs_to :component
  end

and then I do

  Component.reflections[:branches].active_record

I would expect that to be Branch but it is in fact Component.

The inspection of Component.reflections is as below

  {:branches=>#<ActiveRecord::Reflection::AssociationReflection:0x37d86d8 
@active_record=Component, @primary_key_name="component_id",
@options={},
@name=:branches, @macro=:has_many>

How can I get what class the has_many is to?

I am using Rails 1.1/Ruby 1.8.2

Thanks,

Steve Tuckner

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

Steve Tuckner wrote:
> I want to find out what are the associations with another active record 
> class. So If my class is as below:
> 
>   Class Component < ActiveRecord::Base
>     has_many :branches
>   end
> 
>   class Branch < ActiveRecord::Base
>     belongs_to :component
>   end
> 
> and then I do
> 
>   Component.reflections[:branches].active_record
> 
> I would expect that to be Branch but it is in fact Component.
> 
> The inspection of Component.reflections is as below
> 
>  
{:branches=>#<ActiveRecord::Reflection::AssociationReflection:0x37d86d8
> @active_record=Component, @primary_key_name="component_id",
@options={},
> @name=:branches, @macro=:has_many>
> 
> How can I get what class the has_many is to?
Component.reflect_on_association(:branches).klass

Don''t use the reflections[] attribute. It contains both associations
and
aggregations, so you might get the wrong thing.  Use the API. And 
reflect_on_all_associations() returns a list of all the class''s 
associations, so you can find out what they all are that way.

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

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

Josh Susser wrote:
>> How can I get what class the has_many is to?
> 
> Component.reflect_on_association(:branches).klass
> 
> Don''t use the reflections[] attribute. It contains both
associations and
> aggregations, so you might get the wrong thing.  Use the API. And 
> reflect_on_all_associations() returns a list of all the class''s 
> associations, so you can find out what they all are that way.
> 
Thanks that worked just like I wanted.

Steve Tuckner

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