这是我当前的代码
$results = Post::whereIn('category_id', $category_ids)
->raw(function($collection) {
return $collection->aggregate([
[
'$group' => [
'_id' => '$user_id',
'count' => [
'$sum' => 1
]
]
],
[
'$sort' => [
'count' => -1
]
],
[
'$limit' => 10
],
]);
});
我正在尝试获取与某些类别链接的帖子，但这$results返回所有帖子。
如何将其修改为where in+group by？
编辑 （2016-07-14 10：13am）
类别
{
"_id": ObjectID("578489618a8920afcb3f4de2"),
"updated_at": ISODate("2016-07-13T06:21:40.700Z"),
"created_at": ISODate("2016-07-12T07:16:49.913Z"),
}
发布
{
"_id": ObjectID("578499629a89202fcb3f4de3"),
"user_id": "578299629989e02fcb3f4de3",
"title": "How to deal with MongoDB",
"category_id": "578489618a8920afcb3f4de2",
"updated_at": ISODate("2016-07-12T07:16:50.512Z"),
"created_at": ISODate("2016-07-12T07:16:50.512Z")
}
{
"_id": ObjectID("578499629a89202fcb3f4de3"),
"user_id": "578299629989e02fcb3f4de3",
"title": "It's so weird~",
"category_id": "578489618a8920afcb3f4de2",
"updated_at": ISODate("2016-07-12T07:16:50.512Z"),
"created_at": ISODate("2016-07-12T07:16:50.512Z")
}
所以 1 个类别有多个帖子，我想列出每个用户有多少个帖子，并按降序排序。
现在分组和排序已经工作，只是无法过滤特定的category_id
预期产出
| User | Total posts |
|-------|-------------|
| Smith | 11 |
| Ivy | 8 |
| Paul | 3 |
好的，根据你的（奇怪的）集合，如果我理解得很好，它应该是这样的：
<?php
$category_ids = []; //categories goes here
$results = Post::raw(function($collection) use ($category_ids) {
return $collection->aggregate([
//where in...
[
'$match' => [
'category_id' => ['$in' => $category_ids]
]
],
[
'$group' => [
'_id' => '$user_id',
'count' => ['$sum' => 1]
]
],
[
'$sort' => ['count' => -1]
],
[
'$limit' => 10
],
]);
});
管道的第一阶段使用$match和$in来过滤post.category_id $category_ids的帖子。
我应该做这个伎俩！