.Net Core 3.0 possible object cycle was detected which is not supported

Question

I have 2 entities that are related as one to many

public class Restaurant {
   public int RestaurantId {get;set;}
   public string Name {get;set;}
   public          


        

Answer 1

public class Reservation{ 
public int ReservationId {get;set;} 
public int RestaurantId {get;set;} 
[JsonIgnore]
public Restaurant Restaurant {get;set;} 

Above worked also. But I prefer the following

services.AddControllers().AddNewtonsoftJson(options =>
    options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
);

Because first we need to add the attribute to all the models we may have the cyclic reference.