From: Christian Kerth <christian.kerth@...>
Date: 2007-11-16T22:05:37+09:00
Subject: Re: ActiveRecord Problem

Todd Benson wrote:
> On Nov 16, 2007 4:23 AM, Christian Kerth
> <christian.kerth@dynamicmedia.at> wrote:
>> ich m�chte die n:m beziehung zwischen users und courses �ber
> useres_course modellieren.
>>   has_many :users, :through => :users_courses
>>
>> u = User.find(:first, :conditions => [ "username = ?", session["user"]])
>> usercourses = u.users_courses.collect{|x| x.courses}
>>
>> bekomm ich den Fehler: uninitialized constant User::UsersCourse
>>
>> hat jemand eine Idee?
> 
> I don't know any German, but I can guess that your problem is with
> your UserCourse class model.  It doesn't seem like it matches your
> table name.  The #set_table_name and #set_primary_key methods help, if
> you want to match a database.  I've played around with this quite a
> bit.
> 
> I don't know your exact model either, but maybe...
> 
> class UserCourse < ActiveRecord::Base
>   set_table_name :users_courses
>   belongs_to :course
>   belongs_to :user
> end
> 
> hth a lit,
> Todd

I tried to modify my models:

class UserCourse < ActiveRecord::Base
  set_table_name 'users_courses'
  set_primary_key 'users_Id'
  set_primary_key 'courses_Id'
  belongs_to :course
  belongs_to :user
end

class User < ActiveRecord::Base
  set_table_name 'users'
  set_primary_key 'Id'
  has_many :users_courses
  has_many :courses, :through => :users_courses
end

class Course < ActiveRecord::Base
  set_table_name 'courses'
  set_primary_key 'Id'
  has_many :users_courses
  has_many :users, :through => :users_courses
end

The task is to select e.g. all attributes from UserCourse for a certain 
User and Course.
I keep getting the same error.
How do a create a many to many realtion with attributes at all in 
activerecord?

thx ck
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