Laravel雄辩地：将相关模型分组（例如，所有用于收集帖子的评论）

Question

要获取单个帖子的评论：Post::find(1)->comments()

要获取多个帖子：Post::whereBetween('id',[1,10])

如何获取多个帖子的所有合并评论？
Post::whereBetween('id',[1,10])->comments()

Answer 1

使用pluck()：

$posts = Post::whereBetween('id', [1, 10])->with('comments')->get();
$comments = $posts->pluck('comments')->flatten();

Answer 2

您可以使用此

$posts = Post::whereBetween('id',[1,10])->with('comments')->get();

或者如果您不会只收到评论

$comments = App\Comment::whereHas('post', function ($query) {
    $query->whereBetween('id', [1, 10]);
})->get();

或者相关的主键post_id

$comments = App\Comment::whereBetween('post_id', [1, 10])->get();

Answer 3

如果您只想发表评论，并假设您在Comment模型中有一个 post_id 字段，并且您已经指出了该帖子的ID：

$comments = Comment::whereIn('post_id', [1,2,3,4,5,6,7,8,9,10])->get();