Develop the Resource Tier

Now, let’s turn to the service development, which consists of four major steps:

• Creating the entity
• Creating the data access tier
• Creating the business service tier
• Creating the JSON-based REST

We will start with the entity and end with the REST service.

Following a test-driven development approach, we will write the test for the entity followed by the entity implementation. First, create two instances of Customer with a Cart entity followed by an update and a delete. Finally, test whether or not one instance of Customer remains. Note that the essential difference from a unidirectional relationship is to populate the Cart for a Customer and also the Customer for a Cart.