如何使用nodejs在已经存在的文档中添加数组？

Question

I want to insert array in already exist documents.

now my document look like this:

{
    "_id" : ObjectId("5604f0150fe136e9292ee16a"),
    "name" : "mamy",
    "url_Address" : "http://www.flipkart.com/mamy-poko-pants-diaper-large/p/itmdbdffn8gjzpfz?pid=DPRDADE2Z8BZGYZG&ref=L%3A-2196533682561335257&srno=p_1&query=mamy&otracker=from-search",
    "vendor_Name" : "WS Retail",
    "vendor_rating" : "4.2 / 5",
    "last_price_1" : "Rs. 699",
    "last_price_2" : "Rs. 699",
    "prce" : "Rs. 699",
    "product_Name" : "Mamy Poko Pants Diaper - Large",
    "MRP" : "Rs 573"
}

and i want to add an array in this with name competitor:

{
    "_id" : ObjectId("5604f0150fe136e9292ee16a"),
    "name" : "mamy",
    "url_Address" : "http://www.flipkart.com/mamy-poko-pants-diaper-large/p/itmdbdffn8gjzpfz?pid=DPRDADE2Z8BZGYZG&ref=L%3A-2196533682561335257&srno=p_1&query=mamy&otracker=from-search",
    "vendor_Name" : "WS Retail",
    "vendor_rating" : "4.2 / 5",
    "last_price_1" : "Rs. 699",
    "last_price_2" : "Rs. 699",
    "prce" : "Rs. 699",
    "product_Name" : "Mamy Poko Pants Diaper - Large",
    "MRP" : "Rs 573",
    "Competitor : [{
                     "cat_id" : "xx",
                     "name" : "mamy",
                     "url_Address" : "http://www.flipkart.com/mamy-poko-pants-diaper-large/p/itmdbdffn8gjzpfz?pid=DPRDADE2Z8BZGYZG&ref=L%3A-2196533682561335257&srno=p_1&query=mamy&otracker=from-search",
                     "vendor_Name" : "WS Retail",
                     "vendor_rating" : "4.2 / 5",
                     "last_price_1" : "Rs. 699",
                     "last_price_2" : "Rs. 699",
                     "prce" : "Rs. 699",
                     "product_Name" : "Mamy Poko Pants Diaper - Large",
                     "MRP" : "Rs 573"
                    },
                  {
                     "cat_id" : "xxx",
                     "name" : "mamy",
                      "url_Address" : "http://www.flipkart.com/mamy-poko-pants-diaper-large/p/itmdbdffn8gjzpfz?pid=DPRDADE2Z8BZGYZG&ref=L%3A-2196533682561335257&srno=p_1&query=mamy&otracker=from-search",
                     "vendor_Name" : "WS Retail",
                     "vendor_rating" : "4.2 / 5",
                     "last_price_1" : "Rs. 699",
                     "last_price_2" : "Rs. 699",
                     "prce" : "Rs. 699",
                     "product_Name" : "Mamy Poko Pants Diaper - Large",
                     "MRP" : "Rs 573"
                   }]"
}

what query i have to write in mongodb?

what query i have to write in Nodejs?

Answer 1

You need to replace document to add fields:

var updateRestaurants = function(db, callback) {
   db.collection('restaurants').replaceOne(
      { "restaurant_id" : "41704620" },
      {
        "name" : "Vella 2",
        "address" : {
           "coord" : [ -73.9557413, 40.7720266 ],
           "building" : "1480",
           "street" : "2 Avenue",
           "zipcode" : "10075"
        }
      },
      function(err, results) {
        console.log(results);
        callback();
   });
};

look into documentation: http://docs.mongodb.org/getting-started/node/update/

The replacement document can have different fields from the original document.

but be care

After the update, the document only contains the field or fields in the replacement document.

So you need to get document, add you new fields and replace all the document

Answer 2

You can add whole Competitor array in existing document with update given in doc

The query will be as:

db.collection.update({
    "_id": ObjectId("5604f0150fe136e9292ee16a")
}, {
    $set: {
    "Competitor": [{
        "cat_id": "xx",
        "name": "mamy",
        "url_Address": "http://www.flipkart.com/mamy-poko-pants-diaper-large/p/itmdbdffn8gjzpfz?pid=DPRDADE2Z8BZGYZG&ref=L%3A-2196533682561335257&srno=p_1&query=mamy&otracker=from-search",
        "vendor_Name": "WS Retail",
        "vendor_rating": "4.2 / 5",
        "last_price_1": "Rs. 699",
        "last_price_2": "Rs. 699",
        "prce": "Rs. 699",
        "product_Name": "Mamy Poko Pants Diaper - Large",
        "MRP": "Rs 573"
    }, {
        "cat_id": "xxx",
        "name": "mamy",
        "url_Address": "http://www.flipkart.com/mamy-poko-pants-diaper-large/p/itmdbdffn8gjzpfz?pid=DPRDADE2Z8BZGYZG&ref=L%3A-2196533682561335257&srno=p_1&query=mamy&otracker=from-search",
        "vendor_Name": "WS Retail",
        "vendor_rating": "4.2 / 5",
        "last_price_1": "Rs. 699",
        "last_price_2": "Rs. 699",
        "prce": "Rs. 699",
        "product_Name": "Mamy Poko Pants Diaper - Large",
        "MRP": "Rs 573"
    }]
    }
})

Answer 3

You can use $set operator This is official docs

so, what you have to do is

db.collection('collectionName').updateOne({ _id: ObjectId("5604f0150fe136e9292ee16a") }, { $set: { "Competitor": value_you_want_to_insert } })