DDD Principles

Aggregate Roots

• Use AggregateRoots for objects that can be created directly
• All user interactions should go via AggregateRoots
• Exposed via DbContext
• Will have a table in t
• Aggregates can only be pulled in their entirety from the DB. This means that all child entities that make up the aggregate root will also be pulled in

Entities

• Use Entities for objects that are part of an aggregate root and distinguishable by ID (usually a separate table)
• Entities cannot be modified outside of their aggregate root
• Not exposed via DbContext
• Will have a table in the DB
• Internal factory method for creation so that can only be created via aggregate roots
• Behaviors should be internal so that they can only be called by the aggregate root

Value Objects

• Use ValueObjects for objects that are defined by their properties (i.e. not by ID) (usually part of another table)
• Value objects can only be modified as part of their aggregate root
• Will be part of the AggregateRoot table in the DB
• Configured in EF via builder.OwnsOne()

General

• objects can be created using
  • factory methods
• All properties should be readonly (i.e. private)