在laravel 5.4我怎么才能得到用户朋友的帖子？

Question

$user_id = auth::user()->id;
$user_friends = User::find($user_id)->friends;
$user_friends_id = $user_friends->pluck('id');
$posts = Post::where('user_id', $user_friends_id)->get();
return view('dashboard')->with('posts', $posts);

So far i've got the users friends id's in $user_friends_id and then matching them to the user id on the posts but its only getting the first friends posts and not the rest. How can i change it to get all the friends posts and not just the first friends?

Answer 1

You don't need to execute an additional query with find() and then get all friends objects just to get their IDs. It's a huge overhead. Just do this:

Post::whereIn('user_id', auth()->user()->friends()->pluck('id'))->get()

Answer 2

You can use whereIn :

$user_id = auth::user()->id;
$user_friends = User::find($user_id)->friends;
$user_friends_id = $user_friends->pluck('id');
$posts = Post::whereIN('user_id', $user_friends_id)->get();
return view('dashboard')->with('posts', $posts);

In one line:

$posts = Post::whereIn('user_id', auth()->user()->friends()->pluck('id'))->get();

Answer 3

You can use whereIn , for which you need an array of IDs. The Pluck function gives you a collection of just a specific column (key), so you need to call toArray on it to have an array with the values instead of a collection. Further, you can eliminate the extra query with User::find since you are looking for the authenticated user and you already have queried that with Auth::user() .

So I would say you need the following:

$user_friends = Auth::user()->friends;
$user_friends_id = $user_friends->pluck('id')->toArray();
$posts = Post::whereIn('user_id', $user_friends_id)->get();
return view('dashboard')->with('posts', $posts);