:table_name_with_underscore and join models

gdonald
Mon, 03 Nov 2008 23:02:34 -0000

Per my PHBs, I''m using

ActiveRecord::Base.primary_key_prefix_type
= :table_name_with_underscore

in my current project.


My problem is that this setting seems to be causing me some issues
with my join model''s primary keys.

For example I have these three models:

class User < ActiveRecord::Base
  has_many :user_ugroups
  has_many :ugroups, :through => :user_ugroups
end

class Ugroup < ActiveRecord::Base
  has_many :user_ugroups
  has_many :users, :through => :user_ugroups
end

class UserUgroup < ActiveRecord::Base
  belongs_to :user
  belongs_to :ugroup
end


My migration for the join table looks like this:

def self.up
  create_table :user_ugroups, :primary_key => :user_ugroups_id do |t|
    t.integer :user_id,   :null => false
    t.integer :ugroup_id, :null => false
  end
end


So when I create a UserUgroup like so:

>> UserUgroup.create!( :user => @gdonald, :ugroup => @admin )


ActiveRecord tries to insert a NULL for the user_ugroups_id field and
then I get this:

ActiveRecord::StatementInvalid: OCIError: ORA-01400: cannot insert
NULL into
("MYPROJDB"."USER_UGROUPS"."USER_UGROUPS_ID"):
INSERT INTO
user_ugroups (user_ugroups_id, user_id, ugroup_id) VALUES(NULL, 1, 1)


The migration creates my USER_UGROUPS_SEQ without issue, but then it
doesn''t get used.


Any ideas?