How to use findOneAndUpdate using an aggregated query in mongoDB?

问题

I am using nestJS as a backend connected with MongoDB. I am able to access a nested array in my schema which is:

  {
      "id": "productId",
      "name": "productName",
      "price": "productPrice",
      "Categories": [
          {
              "_id": "catId",
              "name": "catName",
              "Subcategories": [
                  {
                      "_id": "subcatId",
                      "name": "subcatName"
                  },
                  {
                      "_id": "subcatId",
                      "name": "subcatName"
                  },
              ]
          },
          {
              "_id": "catId",
              "name": "catName",
              "Subcategories": [
                  {
                      "_id": "subcatId",
                      "name": "subcatName"
                  },
                  {
                      "_id": "subcatId",
                      "name": "subcatName"
                  },
              ]
          }
      ]
  }
  ]

I am able to access categories and subcategories via the following:

db.collection.aggregate([
  {
    $match: {
      "id": "productId"
    }
  },
  {
    $unwind: "$Categories"
  },
  {
    $project: {
      "_id": "$Categories._id",
      "name": "$Categories.name"
    }
  }
])

db.collection.aggregate([
  {
    $match: {
      "id": "productId"
    }
  },
  {
    $unwind: "$Categories"
  },
  {
    $match: {
      "Categories._id": "catId"
    }
  },
  {
    $unwind: "$Categories.Subcategories"
  },
  {
    $project: {
      _id: "$Categories.Subcategories._id",
      name: "$Categories.Subcategories.name"
    }
  }
])

The problem I am facing now is how to update a category or subcategory using the findOneAndUpdate method.

How would i go about accessing the correct category/subcategory _id to update?

Thanks in advance.

回答1:

You want to use arrayFilters like so:

db.collection.updateOne(
    {  
        //query to match document
    },
    { $set: { "Categories.$[cat].name": newValue } }, //set name to new value in categories.

    { $set: { "Categories.Subcategories.$[subCat].name": newValue2 } }, //set name to new value in categories.
    { arrayFilters: [ { "cat._id": categoryId }, { "subCat._id": subCategoryId } ] }
)

Obviously you can replace the name and _id fields to match and update any other fields in the object.

回答2:

You can update category data like this,

You can update exact reference matched in your condition using .$ in your update

db.collection.findOneAndUpdate({
    'id':"productId",
    'Categories._id':"catId1"
},{
    $set:{
        'Categories.$.name':"catName7"
    }
},{
    new:true
})

I'll have to check for SubCategory as its two level down, I'll check & post same late

来源：https://stackoverflow.com/questions/59986592/how-to-use-findoneandupdate-using-an-aggregated-query-in-mongodb

标签

mongodb

mongodb-query

nosql

nestjs