Rails - Jan 2006 - Habtm: I can create the same relation more than 1x!

Hi all

I have a DiscJockey and a Member model, each of them reference each 
other using habtm.

josh $ script/server
>> m=Member.find 1
>> dj=DiscJockey.find 1
>> m.disc_jockeys << dj
>> m.disc_jockeys << dj
>> m.disc_jockeys << dj
Now I have 3 relations in the DB! Is this normal? Shouldn''t there an 
error occur, that I can only add the object a single time?
If it IS normal - how can I prevent it from adding it more than once?

Thanks a lot,
Josh

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

OK, found the following:

http://thread.gmane.org/gmane.comp.lang.ruby.rails/14842

But the reply I don''t understand:

"Compound primary keys in your rel table."

What does that mean? Thanks.

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

I just remarked that the uniq option ignores duplicate relationships, 
but you still can add as many duplicates as you wish. And:
>> m = Member.find 1
>> d = DiscJockey.find 1
>> m.disc_jockeys.push d
>> m.disc_jockeys.push d
>> m.disc_jockeys.size # 2
>> m.reload
>> m.disc_jockeys.size # 1
This can''t be no bug, can it?

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