Property [id] does not exist on the Eloquent builder instance - laravel

Question

I am trying to get comment and it's replies in laravel api,I tried following way and faced to this error, how can I solve it?
this is my controller:
public function postSinglePage(Request $request)
{
$post_id=$request->get('post_id');
$post = Post::where('id',$post_id)->where('status', '=', 1)->get();
return response([
"posts" => GetPostsSinglePageData::collection($post),
]);
}
and this is my resource collection to get post and it's comments:
public function toArray($request)
{
return [
'post_id' => $this->id,
"name" => $this->post_title,
"excerpt" => $this->post_excerpt,
"thumbnail" => $this->getFirstMediaUrl("images"),
"logo" => $this->getFirstMediaUrl("images"),
'comment_count'=>getCommentCount($this->id),
'comments'=> new CommentCollection(Comment::select('*')->where('post_id',$this->id)),
"like" => DB::table("like_tb")->select('like_dislike')
->where("type_like",'=','post')
->where('related_id',$this->id)
->get(),
"share" => DB::table("share_tb")->select("share_number")
->where('type','=','post')
->where("related_id",$this->id)
->get(),
];
}
this is comment collection:
public function toArray($request)
{
return [
'commentId'=>$this->id,
'courseId'=>$this->post_id,
'commentDate'=>$this->date,
'commentText'=>$this->body,
'userId'=>$this->user_id,
'replays'=>ReplyCommentCollection::collection(\App\Models\Comment\ReplyComment::where('comment_id',$this->id)->get()),
'users'=>UserInfoCollection::collection(User::where('id',$this->user_id)->get()),
];
}

Answer 1

$this->id not work in inner other function you must write like this:
public function toArray($request)
{
$comments=Comment::select('*')->where('post_id',$this->id)->get();
$commentCollection= CommentCollection::collection($comments);
return [
'post_id' => $this->id,
"name" => $this->post_title,
"excerpt" => $this->post_excerpt,
"thumbnail" => $this->getFirstMediaUrl("images"),
"logo" => $this->getFirstMediaUrl("images"),
'comment_count'=>getCommentCount($this->id),
'comments'=> $commentCollection,
"like" => DB::table("like_tb")->select('like_dislike')
->where("type_like",'=','post')
->where('related_id',$this->id)
->get(),
"share" => DB::table("share_tb")->select("share_number")
->where('type','=','post')
->where("related_id",$this->id)
->get(),
];
}