Has and belongs to many (HABTM) is the most complex model association available in CakePHP. This association type allows you to define many-to-many relationships in your data model, for example, in an inventory management application, where packages might be stored in different warehouses, and each warehouse might have several packages. This is a typical many-to-many relationship between packages and warehouses.
To model this association, you'll need to use three tables in your database: the
packages table to store the data related to your packages, the
warehouses table, and the
packages_warehouses table, where the association itself is defined. The
packages_warehouses table will have three columns by convention: ...