Why We Use Entities

What is an Entity?

• It is the unique identity and mutability characteristics that differentiate Entities from Value Objects.

• Design a domain concept as an Entity when we care about its individuality when distinguishing it from all other objects in a system.

• An Entity is capable of being changed continuously over a long period of time.

• Entities are often overused. Often a concept should be modeled as a Value.

Be wary of CRUD-based systems

• Businesses regularly put too much effort into developing glorified database table editors.

• If we apply CRUD to the wrong systems - complex systems that deserve DDD - we may regret it.

• When complexity grows, we experience the limitation of poor tool selection.