PostAuthorizationModel.cs

public class PostAuthorizationModel : PostAuthorizationModel<Guid>
{
        public Guid OwnerId {get; private set;}
        public Guid ResourceId {get; private set;}
        private PostAuthorizationModel(Guid ownerId, Guid postId)
        {
            OwnerId = ownerId;
            ResourceId = postId;
        }

        public static PostAuthorizationModel From(Post resource)
        {
            return new PostAuthorizationModel(resource.UserId, resource.Id);
        }
}