sorry I misread your tables. The has_many :through is looking for a
join table with ids for both sides which is the cause of the error,
same kind of table as a HABTM join table.
class Author < ActiveRecord::Base
has_many :authorships
has_many :books, :through => :authorships
end
class Authorship < ActiveRecord::Base
belongs_to :author
belongs_to :book
end
On Aug 18, 3:43 pm, Rick R <[email protected]> wrote:
> On Wed, Aug 18, 2010 at 4:00 PM, Me <[email protected]> wrote:
> > oh you need to add the has_many for the join table
>
> > has_many :meter_goup
> > has_many :meters, :through => :meter_group
>
> I take it you mean on the Subscription table? which currently looks like:
>
> class Subscription < ActiveRecord::Base
> belongs_to :user
> belongs_to :meter_group
> has_many :meters, :through => :meter_group
> end
>
> But a Subscription doesn't have many mete groups, a subscription can only be
> tied to a single meterGroup and has a fk to the meter_group table.
>
> Or are you saying for the other join table "meter_groups_meters" I need to
> make a MeterGroupsMeter model object and add the relationships you
> described?
>
> For reference The other relevant tables are:
>
> class Meter < ActiveRecord::Base
> has_and_belongs_to_many :meter_groups
> belongs_to :user
> end
>
> class MeterGroup < ActiveRecord::Base
> belongs_to :user
> has_and_belongs_to_many :meters
> end
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