如何在不使用 $facet 的情况下在 mongoDB 中实现分页，因为 AZURE 和 AWS 不支持它

Question

我有 collection 类似下面的东西

[
  {
    _id: id1,
    user: user1,
    city: "test1"
  },
  {
    _id: id2,
    user: user2,
    city: "test1"
  },
  {
    _id: id3,
    user: user3,
    city: "test2"
  },
.....
]

我想得到类似的东西，进一步，我想根据 _id 等对结果进行排序

[
  results: [
    {
      _id: id1,
      user: user1,
      city: "test1"
    },
    {
      _id: id1,
      user: user2,
      city: "test1"
    },
   ...
  ],
  totalResults: 220,
  pageNumber: 2
]

我也在项目中使用 moongoose

Answer 1

db.collection.aggregate([
  {
    "$match": {
      query
    }
  },
  {
    $project: {
      user: "$user"
    }
  },
  {
    "$sort": shortBy
  },
  {
    $group: {
      _id: null,
      postCount: {
        $sum: 1
      },
      results: {
        $push: '$$ROOT'
      }
    }
  },
  {
    $project: {
      total: '$postCount',
      results: {
        $slice: [
          '$results',
          skip,
          limit
        ]
      }
    }
  }
])

如何在不使用 $facet 的情况下在 mongoDB 中实现分页，因为 AZURE 和 AWS 不支持它

How to achieve pagination in mongoDB without using $facet as AZURE and AWS do not support it

mongodb

mongoose

azure-cosmosdb-mongoapi