Mongodb 合并集合中字段相同的对象

我正在尝试合并和更新4个字段（名称、面板、部分、小节）相同的对象

i、 e

数据合并1：名称='Field Handbook v1.1'和章节='customer'和小节='manuals'和面板='Revolution Series（R3 Series）'

数据合并2：名称='Field Handbook v1.1'和章节='customer'和小节='manuals'和面板='Eco-Safe Digester（E3系列）'

初始对象

{
    "_id" : ObjectId("5d35e1fd02819f105326c84e"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "pdf",
            "file" : "Revolution Series Digester Field Handbook R3 Series v1.1 150 DPI.pdf"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Revolution Series (R3 Series)"
}


{
    "_id" : ObjectId("5d35e1fd02819f105326c851"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "link",
            "file" : "http://docs.biohitech.com/r3/handbook"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Revolution Series (R3 Series)"
}


{
    "_id" : ObjectId("5d35e1fd02819f105326c856"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "pdf",
            "file" : "Eco-Safe Digester Field Handbook E3 Series v1.1 150 DPI.pdf"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Eco-Safe Digester (E3 Series)"
}


{
    "_id" : ObjectId("5d35e1fd02819f105326c857"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "link",
            "file" : "http://docs.biohitech.com/e3/handbook/"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Eco-Safe Digester (E3 Series)"
}

{
    "_id" : ObjectId("5d35e1fd02819f105326c84e"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "pdf",
            "file" : "Revolution Series Digester Field Handbook R3 Series v1.1 150 DPI.pdf"
        },
        {
            "ext" : "link",
            "file" : "http://docs.biohitech.com/r3/handbook"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Revolution Series (R3 Series)"
}


{
    "_id" : ObjectId("5d35e1fd02819f105326c856"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "pdf",
            "file" : "Eco-Safe Digester Field Handbook E3 Series v1.1 150 DPI.pdf"
        },
        {
            "ext" : "link",
            "file" : "http://docs.biohitech.com/e3/handbook/"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Eco-Safe Digester (E3 Series)"
}

预期结果

{
    "_id" : ObjectId("5d35e1fd02819f105326c84e"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "pdf",
            "file" : "Revolution Series Digester Field Handbook R3 Series v1.1 150 DPI.pdf"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Revolution Series (R3 Series)"
}


{
    "_id" : ObjectId("5d35e1fd02819f105326c851"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "link",
            "file" : "http://docs.biohitech.com/r3/handbook"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Revolution Series (R3 Series)"
}


{
    "_id" : ObjectId("5d35e1fd02819f105326c856"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "pdf",
            "file" : "Eco-Safe Digester Field Handbook E3 Series v1.1 150 DPI.pdf"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Eco-Safe Digester (E3 Series)"
}


{
    "_id" : ObjectId("5d35e1fd02819f105326c857"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "link",
            "file" : "http://docs.biohitech.com/e3/handbook/"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Eco-Safe Digester (E3 Series)"
}

{
    "_id" : ObjectId("5d35e1fd02819f105326c84e"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "pdf",
            "file" : "Revolution Series Digester Field Handbook R3 Series v1.1 150 DPI.pdf"
        },
        {
            "ext" : "link",
            "file" : "http://docs.biohitech.com/r3/handbook"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Revolution Series (R3 Series)"
}


{
    "_id" : ObjectId("5d35e1fd02819f105326c856"),
    "deleted" : false,
    "files" : [
        {
            "ext" : "pdf",
            "file" : "Eco-Safe Digester Field Handbook E3 Series v1.1 150 DPI.pdf"
        },
        {
            "ext" : "link",
            "file" : "http://docs.biohitech.com/e3/handbook/"
        }
    ],
    "name" : "Field Handbook v1.1",
    "section" : "customer",
    "subsection" : "manuals",
    "tags" : [
        "customer",
        "manuals"
    ],
    "panel" : "Eco-Safe Digester (E3 Series)"
}

您可以尝试以下方法：

 db.collection.aggregate([
    {
        $unwind: {
            path: "$files",
            preserveNullAndEmptyArrays: true
        }
    },
    {
        $group: {
            _id: {
                "name": "$name",
                "section": "$section",
                "subsection": "$subsection",
                "panel": "$panel"
            },
            data: {
                $first: "$$ROOT"
            },
            files: {
                $push: "$files"
            }
        }
    },
    {
        $addFields: {
            "data.files": "$files"
        }
    },
    {
        $replaceRoot: {
            newRoot: "$data"
        }
    },
    /** writes to new collection named 'collection_new' will override collection if that name already exists */
    { $out: "collection_new" }
])

测试：

---

一旦您觉得

collection\u new

中的数据良好，您可能需要删除现有集合并将其重命名为旧/实际名称，同时检查索引。如果您可以升级到

>4.2

，那么您可以使用它将文档附加到现有的集合中，这在使用上要干净得多。

那么您想重新更新数据库吗？你的MongoDB版本是什么？@whoami我有一个几乎相同的文档集合，唯一的区别是文件数组。我想将文档合并到一个文档中，并将两个文件数组连接在一起，然后删除用于创建新文档的文档。@whoami db v4.0.11版可以使用

4.011

对您的集合进行聚合并将聚合结果写入其他集合（集合\u新建）&删除现有名称，然后将收藏重新命名为旧名称/实际名称。