Deleting 2 rows from different label in Laravel Controller

So, i have 2 tables named 'topics' and 'posts'.

Topics is for the main content of the thread and posts for its reply.

So, i want to if the user delete its topic, then its following reply/post should also be deleted.

Here is my delete form:

{!! Form::open(['action' => ['TopicController@destroy', $topic->id], 'method' => 'POST', 'class' => 'pull-right']) !!}
    
    
{!! Form::close() !!}

and here is controller:

$topic = Topic::find($id);
$post = Post::where('topic_id', $id)->get();
$topic->delete();
$post->delete();
return redirect('/')->with('Success', 'Post Removed');

But it is giving error:

BadMethodCallException
Method delete does not exist.

What is did wrong here??

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