I got two tables with many to many relationship and I don’t know how to map it. This is the BlogPost model class:

public class BlogPost
{
    public Guid Id { get; set; }
    public string Title { get; set; }
    public string ShortDescription { get; set; }    
    public string Content { get; set; }
    public string FeaturedImageUrl { get; set; }
    public string UrlHandle { get; set; }
    public DateTime PublishedDate { get; set; }
    public string Author {  get; set; }
    public bool IsVisible { get; set; }

    public ICollection<Category> Categories { get; set; }
}

And this is Category:

public class Category
{
     public Guid Id { get; set; }
     public string Name { get; set; }
     public string UrlHandle { get; set; }
     public ICollection<BlogPost> BlogPosts { get; set;}
}

This is my DTO to create a BlogPost:

public class CreateBlogPostRequestDTO
{
     public string Title { get; set; }
     public string ShortDescription { get; set; }
     public string Content { get; set; }
     public string FeaturedImageUrl { get; set; }
     public string UrlHandle { get; set; }
     public DateTime PublishedDate { get; set; }
     public string Author { get; set; }
     public bool IsVisible { get; set; }
     public Guid[] Categories { get; set; }
}

This is my mapper and it is not working

public class AutoMapperProfile : Profile
{
     public AutoMapperProfile()
     {
         //category
         CreateMap<CreateCategoryRequestDTO, Category>().ReverseMap();
         CreateMap<UpdateCategoryRequestDTO, Category>().ReverseMap();
         CreateMap<Category, CategoryDTO>().ReverseMap();

         //blogpost
         //have to custom here but i dont know how to do it
         CreateMap<CreateBlogPostRequestDTO, BlogPost>().ReverseMap();
         CreateMap<BlogPost, BlogPostDTO>().ReverseMap();
     }
}

I’m using AutoMapper, I know I have to customize the mapper