Asymmetrical HABTM(?)

Rails
1

What is the best way to set up a relationship between two tables where
table-1 has a one-to-one relationship with table-2 but table-2 has a
one-to-many relationship with table-1?

For example, suppose there is an events application (seminars, forums,
conferences, etc). Each event has only one address but since many
events can occur at the same location throughout the year, a given
address can belong to many events.

Thanks,
Stan

2

On Jul 21, 2008, at 12:25 AM, stan.baptista wrote:

Stan
That’s just a normal association:

class Event < ActiveRecord::Base
belongs_to :address
end

class Address < ActiveRecord::Base
has_many :events
end

Don’t let the seemingly backward “belongs_to :address” fool you. The
‘belongs_to’ association is on the model that contains the foreign key
(address_id in this example) even though you say “Each event has only
one address…” – the “has … one” is misleading in this case.

-Rob

Rob B. http://agileconsultingllc.com
[email protected]

3

Don’t let the seemingly backward “belongs_to :address” fool you. The
‘belongs_to’ association is on the model that contains the foreign key
(address_id in this example) even though you say “Each event has only
one address…” – the “has … one” is misleading in this case.

Got it. Thanks Rob.

4

That sounds like a plain 1:many to me. Address has_many :events, and
Event belongs_to :address.