Hi, all

I'm looking for a trick how to get something like that:

obj1 = SmthClass.new
obj2 = SmthClass.new

obj1.connections << obj2

 >> obj1.connections
=> obj2

 >> obj2.connections
=> obj1

??

PS: The first solve is to make the third join model, and put them all  
necessary has_many + has_many relationship, then give the join model  
optional method using transaction etc, so it's inevitable to have two  
identical strings in the join models' database table (to obj1 and  
obj2)...? Or i can write some handler to seek obj1 and obj2 using  
'their own' foreign keys one by one through each other (two has_many  
methods with two different foreign keys)?

This earlier thread might be helpful.

http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/...

Regards,
Craig

On 01.09.2008, at 23:29, Craig Demyanovich wrote:

Thanks, I saw it!  But unfortunately this method makes only "one-way"  
association and not vice versa (if i'm not mistaken).
Exactly I need - vice versa associations. I thought the only way to do  
it is to have two strings in the database (obj1 to obj2 and obj2 to  
obj1). Where is the trick?

Ah. I haven't done that yet. A Google search for

"many-to-many" "self-referential" rails

turns up some hits that could be useful.

Regards,
Craig

Ok, thanks, maybe i'll get something intresting or write it myself )
On 02.09.2008, at 0:55, Craig Demyanovich wrote:

This is similar: http://hideto.javaeye.com/blog/75887

What are you think? I guess, there is no transaction improvements to  
be a super nice :)

On 02.09.2008, at 0:55, Craig Demyanovich wrote:

Actually, according to a reply in another thread, you could build on what I
shared earlier. First, declare the habtm as described before, then declare
another habtm named as you want and with the foreign_key and
association_foreign_key swapped around.

class User < ActiveRecord::Base
  has_and_belongs_to_many :friends,
    :class_name => "User",
    :join_table => "users_friends",
    :foreign_key => "user_id",
    :association_foreign_key => "friend_id"
  has_and_belongs_to_many :reverse_friends,
    :class_name => "User",
    :join_table => "users_friends",
    :foreign_key => "friend_id",
    :association_foreign_key => "user_id"
end

Does that work?

Not exactly: association methods differ from each other (.friends  
and .reverse_friends):
 >> friend1.friends
=>  friend2

 >> friend2.reverse_friends
=> friend1

that is not what i want

On 02.09.2008, at 3:14, Craig Demyanovich wrote:

So you like the result but not the name of the association?

That's right.

On 02.09.2008, at 15:47, Craig Demyanovich wrote:

I doubt that you can have two habtm associations with the same name, but
I've never tried it. I suggest you try it. If it works, you have what you
want. If it doesn't work, I suggest finding unique names that you like for
each association. Either way, please share your findings.

Regards,
Craig