A has_many :through (B, C)

rubyonrails-talk
1

Hi,

I'm wondring if it is possible to have a "has_many" through two things at the same time.

For instance:

If I do this,

2

Aurels wrote:

class A   has_many :blops # blobs have things   has_many :blups # blups has things too

  has_many :things, :through => :blops   has_many :things, :through => :blups end

The blop things and the blup things are really different associations, so you can do:

class A   has_many :blops   has_many :blups

  has_many :blop_things, :through => :blops, :source => :thing   has_many :blup_things, :through => :blups, :source => :thing end

If you need to access all of the things together, then you can add an accessor:

def things   blop_things + blup_things end

However you won't be able to use the association methods on this (ie., #find, #sum, etc..)

3

Yes it works. But It would be great to be able to use #find... Thanks!

4

You can use find... but it'll be the ruby array find... not the
association AR find... and you can use SUM, as it is inside Enumerable
class, not the association proxy.

Julian

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