Develop the Data Transfer Object
We will define the data transfer object in this lesson.
We'll cover the following
So far we have seen how to manage one-to-one unidirectional and bi-directional relationships. Let’s start by looking at the one-to-one self-referencing association shown in the previous lesson. Here, the Student
entity has an identifier and a name
field of String type.
The Student
can have an optional mentor who is also a Student
. Within one instance of Student
another instance of Student
(the mentor) can be associated. We will start with the script with the mock user interface initially and then the service.
Data transfer object
The data transfer object does not have the identifier of the Student
mentor object because the internal design of the one-to-one self-referencing relationship is not exposed to the user interface team. In an instance of a Student
object, there could be only one mentor object who is also a Student
.
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