Introduction to service contracts in Magento

We’ve learned about models, resource models, and collections, which are the main parts of the data layer responsible for handling entities and sorting and retrieving them from a database. This works fine in your own custom code, but it’s often better to abstract away direct database calls and rely on code that looks like a publicly facing API instead.

This is the responsibility of a repository, which is another abstraction that sits on top of the other parts of this data layer. Since resource models may contain implementation-specific code such as calling a particular type of database, reposi...