How do I do polymorphic creates "the right way"?

Hello,

I currently have a polymorphic relationship between, for my first step, two tables -- content and blogs.

Content will be anything that a user can submit to the community I'm building -- blogs, links, file uploads, etc.

First, my tables have the following structure:

• contents: id, title, summary, user_id, object_type, object_id, created_at, updated_at
• blogs: id, content, created_at, updated_at

I will note that I have the following under the boot() function of the AppServiceProvider:

    public function boot()
    {
        Relation::morphMap([
           'blog' => \App\Blog::class
        ]);
    }

I have the following relationship defined in my Content model:

    public function object()
    {
        return $this->morphTo();
    }

And I have the following defined in my Blog model:

    public function activity()
    {
        return $this->morphOne(Content::class, 'object');
    }

So, when I create a blog, I need to create both a record in contents and a record in blogs, and I have it working in the store() function of my Blog controller, but I know I’m doing it an absolutely round-about way, and I’m sure I can reduce it to likely one line of code:

    public function store(Request $request)
    {
        $validData = $this->validateBlog();
        $validData['user_id'] = Auth::id();

        $blog = Blog::create($validData);
        $validData['object_type'] = 'blog';
        $validData['object_id'] = $blog->id;

        $content = Content::create($validData);

        return redirect('/blog');
    }

I have seen tutorials that show I should be able to do something like one of the following:

$content->object()->save($blog)
$blog->activity()->save($content)

...but I had no luck.

Can anyone tell me the most efficient way of doing this?

If there is any other information you need, please let me know! As I said, the relationship itself works — I’m able to retrieve the data using $blog->activity and $blog->object calls, but I just can’t get the insert down.

Thanks!