查找不为空的重复项 mongodb [重复]

Question

我正在 mongo 中编写重复数据删除脚本，但它们返回的手机号码等于 null 或空字符串，认为这些都是重复的。我曾尝试在 mongo 中使用$ne，但无法使其正常工作。有谁知道如何返回手机号码不等于null 或空字符串的所有重复项？

    $mobile_duplicates = User::raw(function ($collection) {
        return $collection->aggregate(
            [
                [
                    '$limit' => 200000,
                ],
                [
                    '$group' => [
                        '_id' => [
                            'mobile', //=> '$mobile',
                        ],
                        'uniqueIds' => [
                            '$addToSet' => '$_id',
                        ],
                        'count' => [
                            '$sum' => 1,
                        ],
                    ],
                ],
                [
                    '$match' => [
                        // '_id' => [
                        //    '$ne' => "",
                        // ],
                        // '_id' => [
                        //    '$ne' => null,
                        // ],
                        'count' => [
                            '$gt' => 1,
                        ],
                    ],
                ]
            ],
            [
                'allowDiskUse' => true,
            ]
        );
    });

提前致谢！

Answer 1

在这篇文章中找到了答案！ stackoverflow.com/questions/14184099/...（将 $match 查询分成两个不同的查询 - 这对我有用：

$mobile_duplicates = User::raw(function ($collection) {
        return $collection->aggregate(
            [
                [
                    '$match' => [
                        'mobile' => [
                            '$ne' => '',
                            '$exists' => true,
                        ],
                    ],
                ],
                [
                    '$group' => [
                        '_id' => [
                            'mobile' => '$mobile',
                        ],
                        'uniqueIds' => [
                            '$addToSet' => '$_id',
                        ],
                        'count' => [
                            '$sum' => 1,
                        ],
                    ],
                ],
                [
                    '$match' => [
                        'count' => [
                            '$gt' => 1,
                        ],
                    ],
                ],
            ],
            [
                'allowDiskUse' => true,
            ]
        );
    });