User has one `Account` (has one), many `Pets` (has many) and `Toys` (has many - polymorphic) He works in a Company (belongs to), he has a Manager (belongs to - single-table), and also managed a Team (has many - single-table) He speaks many languages (many to many) and has many friends (many to many - single-table) His pet also has one Toy (has one - polymorphic) NamedPet is a reference to a Named `Pets` (has many).