Question:

How you can modify your AddPost method

You can do the following to modify the AddPost method:

Create a detached Blog entity and set its Id property to match the Blog ID in the newPost object.
Attach the detached Blog entity to the context or set its state to Unchanged.
Add the new post to the context.
Here's an example of how you can modify your AddPost method to achieve this:

public void AddPost(Post newPost)

{

var blog = new Blog { Id = newPost.Blog.Id }; // Create a detached Blog with the same Id

// Attach the detached Blog entity to the context, marking it as Unchanged

_context.Attach(blog);

// Add the new Post to the context

_context.Add(newPost);

_context.SaveChanges();

}