Domain Models with complex properties construction

According to this article: Using Ids in Domain Models is not a good practice. We should reference the entire domain model instead.

In this case, when we want to provide only Getters for our properties, we have no choice but to use the constructor parameters to pass all the data.

example :

class Car {      public Car(string name, Model model, Engine engine){         Name = name;         Model model = model;         Engine = engine;     }      public string Name {get;}     public Model Model {get;}     public Engine Engine {get} } 

In a case where we receive a DTO from the front end for example:

class CarDto {     public string Name {get;set;}     public long ModelId {get;set;}     public long EngineId {get;set;} } 

How to construct the domain model from this?

  • Should we fetch the Engine and Model from the database by their ids before building the domain model ?

Also in the case when in our Domain Model we have some complex properties that are not always set, is it enough to just pass null as a parameter, or they shouldn’t appear at all in the constructor, and give them a Setter ?

Any other suggestion is welcome.

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A delivery loop was detected which causes this email to be undeliverable when using a domain alias with Google Apps

This is a follow-on to the question “How can I add an email alias to a domain alias in Google Apps?”

A primary domain has been successfully set-up with Google Apps (not G Suite) e.g.

A secondary domain alias to the primary domain has also been setup. It has been verified e.g.

Although I successfully receive an email that is sent to, the error message “A delivery loop was detected which causes this email to be undeliverable” is received when an email is sent to

It has been 24 hours since the domain alias was added.

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