public class ApplicationUserViewModel : Identifiable<string> { public ApplicationUserViewModel() { Id = Guid.NewGuid().ToString(); Roles = new List<ApplicationRoleViewModel>(); } [NotMapped] public string StringId { get => Id; set => Id = value; } [Attr("username")] public string UserName { get; set; } [Attr("email")] public string Email { get; set; } [HasMany("roles")] public List<ApplicationRoleViewModel> Roles { get; set; } } public class ApplicationRoleViewModel : Identifiable<string> { public ApplicationRoleViewModel() { Users = new List<ApplicationUserViewModel>(); Id = Guid.NewGuid().ToString(); } [NotMapped] public string StringId { get => Id; set => Id = value; } [Attr("name")] public string Name { get; set; } [HasMany("users")] public List<ApplicationUserViewModel> Users { get; set; } } 

{ "data": { "id": "461a2700-114b-4667-bacf-e4425d52354f", "attributes": { "email": "123@123.com" }, "relationships": { "roles": { "data": [ { "type": "roles", "id": "67fd9442-9d8c-45de-bf42-4af8be9a8d40" } ] } }, "type": "users" } }