class Project < ActiveRecord::Base has_and_belongs_to_many :developers, -> { uniq.order 'developers.name desc, developers.id desc' } has_and_belongs_to_many :readonly_developers, -> { readonly }, :class_name => "Developer" has_and_belongs_to_many :selected_developers, -> { uniq.select "developers.*" }, :class_name => "Developer" has_and_belongs_to_many :non_unique_developers, -> { order 'developers.name desc, developers.id desc' }, :class_name => 'Developer' has_and_belongs_to_many :limited_developers, -> { limit 1 }, :class_name => "Developer" has_and_belongs_to_many :developers_named_david, -> { where("name = 'David'").uniq }, :class_name => "Developer" has_and_belongs_to_many :developers_named_david_with_hash_conditions, -> { where(:name => 'David').uniq }, :class_name => "Developer" has_and_belongs_to_many :salaried_developers, -> { where "salary > 0" }, :class_name => "Developer" 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}"} has_and_belongs_to_many :well_payed_salary_groups, -> { group("developers.salary").having("SUM(salary) > 10000").select("SUM(salary) as salary") }, :class_name => "Developer" attr_accessor :developers_log after_initialize :set_developers_log def set_developers_log @developers_log = [] end def self.all_as_method all end scope :all_as_scope, -> { all } end class SpecialProject < Project def hello_world "hello there!" end end