Mongo 带排序的不同查询不起作用

Question

我运行在 mongo 中使用 php 进行查询，如下所示：

$column ='address.roadname';



(new MongoDB\Client())->db->mycollection->distinct($column,[],['$sort'=> [$column => 1]]);

查询给出结果，但未排序。
我错过了什么？

数据只是“嵌套”到内部对象中的字符串
我期望的是按字母顺序排序的街道名称列表

示例数据：

[
  {
    "name": "tizio",
    "address": [
      {
        "roadType": "via",
        "roadname": "Roma",
        "number": "12 bis",
        "city": "Milano"
      },
      {
        "roadType": "via",
        "roadname": "Emilia",
        "number": "124",
        "city": "Modena"
      },
      {
        "roadType": "via",
        "roadname": "Appia",
        "number": "89",
        "city": "Genova"
      }
    ]
  },
  {
    "name": "caio",
    "address": [
      {
        "roadType": "vicolo",
        "roadname": "stretto",
        "number": "12",
        "town": "Monza"
      },
      {
        "roadType": "largo",
        "roadname": "Garibaldi",
        "number": "24",
        "city": "Modena"
      },
      {
        "roadType": "piazza",
        "roadname": "Armi",
        "number": "26",
        "city": "Rovigo"
      }
    ]
  },
  {
    "name": "sempronio",
    "address": [
      {
        "roadname": "Roma",
        "number": "15",
        "city": "Milano"
      },
      {
        "roadType": "via",
        "roadname": "Po",
        "number": "4",
        "city": "Torino"
      },
      {
        "roadType": "largo",
        "roadname": "Garibaldi",
        "number": "9",
        "community": "Genova"
      }
    ]
  }
]

我的期望：

Appia,Armi,Emilia,Garibaldi,Po,Roma,Stretto

注意：如果我运行它在 mongo 控制台上


db.mycollection.distinct("address.roadname").sort()

我得到了预期的结果

Answer 1

distinct 的 PHP 实现确实有一个 sort 选项，参见 https://docs.mongodb.com/php-library/v1.7/reference/method/MongoDBCollection-distinct/

在您的 shell 示例中，

db.mycollection.distinct("address.roadname")

returns 一个数组，所以当你运行 .sort() 时，它正在使用 javascript Array.sort 方法。

PHPdistinct函数也是returns一个数组，所以用sort函数就可以了。

Mongo 带排序的不同查询不起作用

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