Rails - May 2006 - How to declare several HABTM-relationships?

Hello,

Is it possible to have several HABTM-relationships for the same object?

Example: Imagine I have 3 objects (classroom, student, teacher) and 
define the associations for the student as:

class Student < ActiveRecord::Base
has_and_belongs_to_many :classrooms
has_and_belongs_to_many :teachers

class Classroom < ActiveRecord::Base
has_and_belongs_to_many :students

class Teacher < ActiveRecord::Base
has_and_belongs_to_many :students

When I create a new student I have checkboxes to display and assign the 
student to a set of classrooms and teachers. This seems to work, the 
student is saved but only one join-table (classrooms_students) is 
populated with the relation. The students_teachers table is not 
populated. Changing the order of the HABTM-declarations will reverse the 
problem (ie, only the first declaration works).

Is it not possible to declare several relations like this, have I just 
screwed up the syntax or committed some far greater sin in how I 
structured the database?

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Posted via http://www.ruby-forum.com/.

Bonicon wrote:
> When I create a new student I have checkboxes to display and assign the 
> student to a set of classrooms and teachers. This seems to work, the 
> student is saved but only one join-table (classrooms_students) is 
> populated with the relation. The students_teachers table is not 
> populated. Changing the order of the HABTM-declarations will reverse the 
> problem (ie, only the first declaration works).
This was a bug in Rails 1.0. If you''re using it you''ll have to
upgrade to 1.1.

-- 
We develop, watch us RoR, in numbers too big to ignore.

Thanks, I upgraded to 1.1 and it is working as it should now.

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