public class BlogPost
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public string Content { get; set; }
        public ICollection<Tag> Tags { get; set; } = new List<Tag>();
        public DateTime DateTime { get; set; }
        public ICollection<PostComment> PostComments { get; set; } = new List<PostComment>();
    }
    public class Tag
    {
        public int Id { get; set; }
        public int ParentPostId { get; set; }
        public BlogPost ParentPost { get; set; }
        public string TagWord { get; set; }

    }