class Project < ActiveRecord::Base has_and_belongs_to_many :developers, :uniq => true has_and_belongs_to_many :developers_named_david, :class_name => "Developer", :conditions => "name = 'David'", :uniq => true has_and_belongs_to_many :salaried_developers, :class_name => "Developer", :conditions => "salary > 0" has_and_belongs_to_many :developers_by_sql, :class_name => "Developer", :delete_sql => "DELETE FROM developers_projects WHERE project_id = \#{id} AND developer_id = \#{record.id}" has_and_belongs_to_many :developers_with_callbacks, :class_name => "Developer", :before_add => Proc.new {|o, r| o.developers_log << "before_adding#{r.id}"}, :after_add => Proc.new {|o, r| o.developers_log << "after_adding#{r.id}"}, :before_remove => Proc.new {|o, r| o.developers_log << "before_removing#{r.id}"}, :after_remove => Proc.new {|o, r| o.developers_log << "after_removing#{r.id}"} attr_accessor :developers_log def after_initialize @developers_log = [] end end class SpecialProject < Project def hello_world "hello there!" end end