trustieforge/app/models/org_member.rb

class OrgMember < ActiveRecord::Base
  attr_accessible :organization_id, :role, :user_id
  belongs_to :organization
  belongs_to :user
  has_many :roles ,:through => :org_member_roles,:foreign_key => 'role_id'
  has_many :org_member_roles,:dependent => :destroy

end