Rails has_and_belongs_to_many problem

ruby-talk
1

I have two classes Album and Korisnik (think about that as user),
they are connected with album_korisnik table (I have pluralization turned off).

Her is the declaration:

class Album < ActiveRecord::Base
  ...
  has_and_belongs_to_many :prijatelji, :class_name => 'Korisnik'
  ...

class Korisnik < ActiveRecord::Base
  ...
  has_and_belongs_to_many :albumi_prijatelja, :class_name => 'Album'
  ...

I'm trying to add new korisnik to the album, and this is not working:
prijatelji << k
but this line is working ok
k.albumi_prijatelja << self

In the first case i don't get any error in the log, and don't get any sql commands in transaction.

What I'm doing wrong?

Thanks,
Igor

2

This should work:
a = Album.find(1) # find an album
k = Korisnik.find(1) # find a Korisnik
a.prijatelji << k # add the Korisnik to the album

Converserly:
a = Album.find(1) # find an album
k = Korisnik.find(1) # find a Korisnik
k.albumi_prijatelja << a # add the album to the Korisnik

Either way should add to the many-many association.

I assume you are using "k.albumi_prijatelja << self" from inside a
method of the Album class? which is why it might work. If that is
the case, then your first example isn't working because I think it
would need to be "self.prijatelji << k" not just "prijatelji << k".
If you are trying to do this within a controller method, then use the
examples I provided.

HTH,

Jason

···

On 5/4/05, Igor Anic <ianic@4dva.hr> wrote:

I have two classes Album and Korisnik (think about that as user),
they are connected with album_korisnik table (I have pluralization
turned off).

Her is the declaration:

class Album < ActiveRecord::Base
        ...
        has_and_belongs_to_many :prijatelji, :class_name => 'Korisnik'
        ...

class Korisnik < ActiveRecord::Base
        ...
        has_and_belongs_to_many :albumi_prijatelja, :class_name => 'Album'
        ...

I'm trying to add new korisnik to the album, and this is not working:
prijatelji << k
but this line is working ok
k.albumi_prijatelja << self

In the first case i don't get any error in the log, and don't get any
sql commands in transaction.

What I'm doing wrong?

Thanks,
Igor

3

Sorry,
it was my mistake (as usual).
Both ways are working now.

korisnik_id was an autoincrement field in the database !!!
is it strange that I didn't get failed update statement?

Thank you Jason and sorry for the stupid question.

Jason Foreman wrote:

···

On 5/4/05, Igor Anic <ianic@4dva.hr> wrote:

I have two classes Album and Korisnik (think about that as user),
they are connected with album_korisnik table (I have pluralization
turned off).

Her is the declaration:

class Album < ActiveRecord::Base
       ...
       has_and_belongs_to_many :prijatelji, :class_name => 'Korisnik'
       ...

class Korisnik < ActiveRecord::Base
       ...
       has_and_belongs_to_many :albumi_prijatelja, :class_name => 'Album'
       ...

I'm trying to add new korisnik to the album, and this is not working:
prijatelji << k
but this line is working ok
k.albumi_prijatelja << self

In the first case i don't get any error in the log, and don't get any
sql commands in transaction.

What I'm doing wrong?

Thanks,
Igor

This should work:
a = Album.find(1) # find an album
k = Korisnik.find(1) # find a Korisnik
a.prijatelji << k # add the Korisnik to the album

Converserly:
a = Album.find(1) # find an album
k = Korisnik.find(1) # find a Korisnik
k.albumi_prijatelja << a # add the album to the Korisnik

Either way should add to the many-many association.

I assume you are using "k.albumi_prijatelja << self" from inside a
method of the Album class? which is why it might work. If that is
the case, then your first example isn't working because I think it
would need to be "self.prijatelji << k" not just "prijatelji << k". If you are trying to do this within a controller method, then use the
examples I provided.

HTH,

Jason