如何在MongoDB中更新多层嵌套数组? [英] How can I update a multi level nested array in MongoDB?

问题描述

如何更新具有多层数组嵌套级别的文档中的记录?

How can I update a record in a document with multiple levels of array nesting?

我的文档结构如下:

{
  "_id": "5bfa09f0a0441f38d45dcc9c",
  "nombre": "PROYECTO MAIN",
  "area": "Sistemas",
  "fecha": "27/01/2018",
  "reuniones": [
    {
      "_id": "5bfa09f0a0441f38d45dcc99",
      "objetivo": "Objetivo MODIFICADO",
      "fecha": "25/10/2018",
      "participantes": [
        {
          "nomina": 1,
          "nombre": "MODIFICADO",
          "rol": "rol",
          "area": "area",
          "firma": "url/imagen.jpg"
        },
        {
          "nomina": 2,
          "nombre": "nombre 2",
          "rol": "rol",
          "area": "area",
          "firma": "url/imagen.jpg"
        }
      ]
    }
  ],
  "_class": "proyecto"
}

使用以下查询，向我返回上述文档.

Using the following query, returns me the document mentioned above.

 db.proyectos.find({
    _id:ObjectId("5bfa09f0a0441f38d45dcc9c"),
    "reuniones._id":ObjectId("5bfa09f0a0441f38d45dcc99"), 
    "reuniones.participantes.nomina":2 
 })

我想用名词2更新参与者的公司领域.

I want to update the firma field of participant with nomina 2.

推荐答案

从Mongo 3.6开始，您可以

Since Mongo 3.6, you can update multi-nested arrays by combining the following operators:

• $set (以更新特定字段)
• $[] (以匹配任何项目在一个数组中)
• (以匹配数组中的特定项目)

• $set (to update a specific field)
• $[] (to match any item in an array)
• $[<identifier>] (to match specific items in an array)

示例

在这里，您可以更新具有reuniones数组的特定proyectos文档，该文档具有participantes数组，该数组的对象的字段nomina等于2:

Here's how you can update a specific proyectos document that has a reuniones array that has a participantes array that has an object with the field nomina equal to 2:

// update a specific proyectos document
// that has a field "reuniones" which is an array
// in which each item is an object with a field "participantes" that is an array
// in which each item is an object that has a field "nomina" equal to 2
db.proyectos.update({
  _id: ObjectId("5bfa09f0a0441f38d45dcc9c"),
}, {
  $set: {
    "reuniones.$[].participantes.$[j].firma": <your update>
  },
}, { 
  arrayFilters: [
    {
      "j.nomina": 2
    }
  ]
})

如果您想将查询限制为特定的reunion，则可以执行以下操作:

If you wanted to limit your query to a specific reunion, you can do:

db.proyectos.update({
  _id: ObjectId("5bfa09f0a0441f38d45dcc9c"),
}, {
  $set: {
    "reuniones.$[i].participantes.$[j].firma": <your update>
  },
}, { 
  arrayFilters: [
    {
      "i._id": ObjectId("5bfa09f0a0441f38d45dcc99")
    },
    {
      "j.nomina": 2
    }
  ]
})

要更新所有满足上述条件的proyectos，只需省略_id查询:

To update all proyectos satisfying the above condition, just omit the _id query:

// update all proyectos
// that have a field "reuniones" which is an array
// in which each item is an object with a field "participantes" that is an array
// in which each item is an object that has a field "nomina" equal to 2    
db.proyectos.update({}, {
  $set: {
    "reuniones.$[].participantes.$[j].firma": <your update>
  },
}, { 
  arrayFilters: [
    {
       "j.nomina": 2
    }
  ]
})

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