On 09/13/2011 04:21 PM, Colin Law wrote:
On 13 September 2011 22:17, Randy Regnier<rbregn...@gmail.com> wrote:
On 09/13/2011 03:34 PM, Jesse wrote:
On 9/13/11 1:22 PM, Randy Regnier wrote:
I have a question about how best to model a pair of properties/attributes
in Rails3. The generic "models" are:
class Foo< ActiveRecord::Base
end
class Bar< ActiveRecord::Base
end
I want Foo to have two associations with Bar, along the lines of
'has_one' for each association, where I can work with each, as in bar1 and
bar2. 'has_many' would work, but it would be extra work to have to fish the
correct one out of the array, and isn't as elegant a way to model the
relationships.
Thanks
Randy
I suppose that it could be done with a has_one relationship repeated as
such
class Foo< AR::B
belongs_to :bar1, class_name => "Bar", :foreign_key => "bar1_id"
belongs_to :bar2, class_name => "Bar", :foreign_key => "bar2_id"
end
Mind you this is not a very elegant way of doing it, but it is adhering to
KiSS principles.
On the Bar end of things, how should the relationship play out? Should it
only be able to be associated to one Foo?
Also are do bar 1 and bar 2 behave differently or have any characteristic
that distinguish them. In other words, are all bar1's always going to be
bar1's? if so you can do a normal has many relationship with a limit of 2
children and then scopes on the bar model to make up the difference.
Jesse
Thanks.
On the Bar end, it would only be associated with the one Foo, yes.
bar1 and bar2 would have different values for their respective properties,
but that is about all. Well, I guess if a Foo got removed, then so should
both of its Bars, but I think I've seen how to do that part.
Looking at a Bar can you tell whether it is a bar1 or a bar2 just from
the records contents?
Colin
It is possible to tell bar1 from bar2 from the contents, in the few use
cases I'm thinking of right now, yes.
Randy
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