public class BlogContext : DbContext
{
    public DbSet<Post> Posts { get; set; }
    public DbSet<PostTagMap> PostTags { get; set; }
    public DbSet<Category> Categorys { get; set; }
    public DbSet<Tag> PostTags { get; set; }
}
public class Post
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string ShortDescription { get; set; }
    public string Meta { get; set; }
    public string UrlSlug { get; set; }
    public bool Published { get; set; }
    public DateTime PostedOn { get; set; }
    public DateTime? Modified { get; set; }
    public Category Category { get; set; }
    public IList<Tag> Tags { get; set; }
}
public class PostTagMap
{

}
public class Category
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string UrlSlug { get; set; }
    public string Description { get; set; }
    public IList<Post> Posts { get; set; }
}
public class Tag
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string UrlSlug { get; set; }
    public string Description { get; set; }
    public IList<Post> Posts { get; set; }
}