正确配置多对一关系 ef core

Question

I am using the CQRS pattern in my project. I want it to be possible that my customer entity has an array of addresses, so I have configured a one-to-many EF relationship. However, when I create a new customer and then retrieve it, the addresses' field is just an empty array:

{
   "id": 1,
   "firstName": "string",
   "lastName": "string",
   "phone": "string",
   "email": "string",
   "primaryContact": "string",
   "secondaryContact": "string",
   "addresses": [],
   "orders": []
}

I'm fairly new to using AutoMapper, so I am wondering if I am not configuring the relationship properly

Customer Entity:

public class Customer : AuditableEntity
{
   public string FirstName { get; set; }
   public string LastName { get; set; }
   public string Phone { get; set; }
   public string Email { get; set; }
   public string PrimaryContact { get; set; }
   public string SecondaryContact { get; set; }

   #region Navigation Properties

   public virtual ICollection<Address> Addresses { get; set; }
   public virtual ICollection<Order> Orders { get; set; }

   #endregion
}

Address Entity:

public class Address : AuditableEntity
{
   public string AddressLine1 { get; set; }
   public string AddressLine2 { get; set; }
   public string Region { get; set; }
   public string PostalCode { get; set; }
   public string Country { get; set; }
}

The AddressDTO is just the properties set in the address entity, without the navigations properties.

public class AddressCreateDto
{
   public string AddressLine1 { get; set; }
   public string AddressLine2 { get; set; }
   public string Region { get; set; }
   public string PostalCode { get; set; }
   public string Country { get; set; }
}

GetCustomerByIdResponse

public class GetCustomerByIdResponse
{
   public int Id { get; set; }
   public string FirstName { get; set; }
   public string LastName { get; set; }
   public string Phone { get; set; }
   public string Email { get; set; }
   public string PrimaryContact { get; set; }
   public string SecondaryContact { get; set; }
        
   public virtual ICollection<Address> Addresses { get; set; }
   public virtual ICollection<Order> Orders { get; set; }
}

My Auto Mapper profile:

public AddressProfile()
{
   CreateMap<AddressCreateDto, Address>().ReverseMap();
   CreateMap<CreateCustomerCommand, Address>().ReverseMap();
}

public CustomerProfile()
{
   CreateMap<CreateCustomerCommand, Customer>().ReverseMap();
   CreateMap<GetCustomerByIdResponse, Customer>()
      .ForMember(dst => dst.Orders, opt => opt.MapFrom(src =>
                 src.Orders))
      .ReverseMap();
}

Answer 1

After fixing the relations from pre-edited post like you did, I would check and make sure that when retrieving Customer entity using EF you are using the

Include(x => x.Addresses)

So it will look somewhat like this (in simplified version)

var customers = Customers
    .Include(x => x.Addresses)
    .Include(x => x.Orders)
    .ToList();

Otherwise EF core will not grab them from db. Same goes for Orders , they need separate Include declaration.