Creating one-to-one maps
Entities can be related to each other in different ways. A one-to-one relation is one where each individual entity may be related to another, and this other one, if it exists, is directly related to the first. Examples include the following:
- A relation from a person to their address, assuming that no two people share the same address
- Additional details for an order
- A person and their pet
- A country and its head of state
A one-to-one relation is easy to represent in domain model terms: each of the entities has a reference to the other. Only one side can be made required; otherwise, we would have a problem: which one comes first? Let's see how we can map this kind of relation in Entity Framework Core.
Getting ready
We will be using ...
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