Rails - Jan 2008 - Setting association values via id or objects

Hi there,

I''ve got a question about best practice/preferred method of setting up
an association.  I have a User model which has and belongs to many
interests.

From playing about with the console I know I can go..

interests = Interests.find([1,2,3,4])
user = User.new(:interests=>interests)
...or...
user = User.new(:interest_ids=>[1,2,3,4,5])

and similarly on existing objects

user.interest_ids = [1,2,3,4]
or user.interests = [interest_obj_a, interest_obj_b, interest_obj_c)

My question is, is there a functional difference between the two, or
can one freely interchange between setting relations via id or via
literal objects?

Thanks,

Gavin.
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gavin.robertson1986-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org
wrote:
> Hi there,
> 
> I''ve got a question about best practice/preferred method of
setting up
> an association.  I have a User model which has and belongs to many
> interests.
> 
> From playing about with the console I know I can go..
> 
> interests = Interests.find([1,2,3,4])
> user = User.new(:interests=>interests)
> ...or...
> user = User.new(:interest_ids=>[1,2,3,4,5])
> 
> and similarly on existing objects
> 
> user.interest_ids = [1,2,3,4]
> or user.interests = [interest_obj_a, interest_obj_b, interest_obj_c)
> 
> My question is, is there a functional difference between the two, or
> can one freely interchange between setting relations via id or via
> literal objects?
> 
> Thanks,
> 
There is no difference in the results, where there might be a difference 
is in how many calls to the database each takes.  Do which ever is more 
straight forward to start, however.  By the time it makes a performance 
difference you may have ditched the HABTM relationship for something 
saner anyway.

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

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