Question

这是示例示例json，在文本数组中我有重复值，如“SEQUENCE”：1重复，我只想存在一条记录，可以建议如何删除重复记录。我有100个这样的文件。

请建议我使用一个查询来执行此操作。

"description": {
      "content": [],
      "details": [
        {
          "CONTENT_TYPE_ID": 0,
          "DESCRIPTION_NAME": "Bullets",
          "DESCRIPTION_TYPE_ID": 2,
          "TAB_SEQ": 0,
          "TEXT": [
            {
              "SEQUENCE": 1,
              "DESCRIPTION": "Double sided print, allows complete application on one sheet"
            },
            {
              "SEQUENCE": 1,
              "DESCRIPTION": "Double sided print, allows complete application on one sheet"
            },
            {
              "SEQUENCE": 1,
              "DESCRIPTION": "Double sided print, allows complete application on one sheet"
            },
            {
              "SEQUENCE": 2,
              "DESCRIPTION": "8-1/2\" x 11\""
            },
            {
              "SEQUENCE": 2,
              "DESCRIPTION": "8-1/2\" x 11\""
            },
            {
              "SEQUENCE": 2,
              "DESCRIPTION": "8-1/2\" x 11\""
            },
            {
              "SEQUENCE": 3,
              "DESCRIPTION": "One-part"
            },
            {
              "SEQUENCE": 3,
              "DESCRIPTION": "One-part"
            },
            {
              "SEQUENCE": 3,
              "DESCRIPTION": "One-part"
            },
            {
              "SEQUENCE": 4,
              "DESCRIPTION": "3-hole punched"
            },
            {
              "SEQUENCE": 4,
              "DESCRIPTION": "3-hole punched"
            },
            {
              "SEQUENCE": 4,
              "DESCRIPTION": "3-hole punched"
            },
            {
              "SEQUENCE": 5,
              "DESCRIPTION": "50 forms per pack, 2 packs included"
            },
            {
              "SEQUENCE": 5,
              "DESCRIPTION": "50 forms per pack, 2 packs included"
            },
            {
              "SEQUENCE": 5,
              "DESCRIPTION": "50 forms per pack, 2 packs included"
            },
            {
              "SEQUENCE": 6,
              "DESCRIPTION": "Employment and other laws change periodically.  Check the laws in your jurisdiction to see if this form is acceptable."
            },
            {
              "SEQUENCE": 6,
              "DESCRIPTION": "Employment and other laws change periodically.  Check the laws in your jurisdiction to see if this form is acceptable."
            },
            {
              "SEQUENCE": 6,
              "DESCRIPTION": "Employment and other laws change periodically.  Check the laws in your jurisdiction to see if this form is acceptable."
            }
          ]
        }]
    }

Answer 1

我认为你可以使用聚合管道建立一个新的集合，我的方法是：

$ unwind TEXT
$ group以消除重复
$ group再次重建文档
$ project完成重建
$ out in另一个系列

db.description.aggregate（[ {$ unwind：“$ details.TEXT”}， {$ gruop：{“_ id”：{“key”：“$ _id”，“TEXT”：“$ details.TEXT”}}}， {$ gruop：{“_ id”：“$ _id.key”，“details.TEXT”：{$ push：“$ _id.TEXT”}}} ]）;

我没有测试它，你将不得不处理细节，但我认为这将完成这项工作！

如何删除MongoDB文档中数组内的重复值？

1 个答案: