Polymorphic Associations

Rails
1

If anybody on edge familiar with this could help, that would be “great”
:slight_smile:

I have different types of things I want to be “reviewable”. So, instead
of
having a slew of HABTM… this new Polymorphic Associations schtick
seemed
like the best solution. I have everything setup as I thought it should
be
(so I think)… but it doesn’t appear to be working correctly. Here is
my
setup:

User (table Clients: basic user stuff belonging to a functional
STI
relationship)

def User < Client
has_many :reviewings, :as => :reviewable, :dependent => true
has_many :reviews, :through => :reviewings
end

Review (table Reviews: id, rating, review)

def Review < AR:B
has_many :reviewings
end

Reviewing (table Reviewings: id, review_id, reviewable_id,
reviewable_type)

def Reviewing < AR:B
belongs_to :review
belongs_to :reviewable, :polymorphic => true
end

Now, within console:

u = User.find(:first)
my user stuff

r = Review.find(:first)
my review stuff

u.reviews << r
added r to u’s reviews

I check the “reviews” table, and the review is successfully entered…
however, there is no entry in “reviewables”.
I’ve played around with this for quite a while trying to debug why an
insert
isn’t happening into this table, but no dice.

Any insight into this would be greatly appreciated !

Dylan

2

On 2/8/06, Dylan S. [email protected] wrote:

relationship)
has_many :reviewings

I check the “reviews” table, and the review is successfully entered…
however, there is no entry in “reviewables”.
I’ve played around with this for quite a while trying to debug why an insert
isn’t happening into this table, but no dice.

Any insight into this would be greatly appreciated !

Dylan

do you have a reviewable_id and reviewable_type field? polymorphic
joins are like backwards STI classes…

–
Rick O.
http://techno-weenie.net

3

Yup ! It’s in the “reviewings” table. (note the column names next to
the
class definitions in my first email.)