Update field in exact element array in MongoDB

Question

I have a document structured like this:

{
    _id:\"43434\",
    heroes : [
        { nickname : \"test\",  items : [\"\", \"\", \"\"] },
        { nickname          


        

Answer 1

You need to make use of 2 concepts: mongodb's positional operator and simply using the numeric index for the entry you want to update.

The positional operator allows you to use a condition like this:

{"heroes.nickname": "test"}

and then reference the found array entry like so:

{"heroes.$  // <- the dollar represents the first matching array key index

As you want to update the 2nd array entry in "items", and array keys are 0 indexed - that's the key 1.

So:

> db.denis.insert({_id:"43434", heroes : [{ nickname : "test",  items : ["", "", ""] }, { nickname : "test2", items : ["", "", ""] }]});
> db.denis.update(
    {"heroes.nickname": "test"}, 
    {$set: {
        "heroes.$.items.1": "new_value"
    }}
)
> db.denis.find()
{
    "_id" : "43434", 
    "heroes" : [
        {"nickname" : "test", "items" : ["", "new_value", "" ]},
        {"nickname" : "test2", "items" : ["", "", "" ]}
    ]
}

Answer 2

db.collection.update(
{
heroes:{$elemMatch:{ "nickname" : "test"}}},
 {
     $push: {
        'heroes.$.items': {
           $each: ["new_value" ],
           $position: 1
        }
     }
   }

)

Answer 3

This solution works well. Just want to add one point. Here is the structure. I need to find OrderItemId is 'yyy' and update. If the query field in condition is an array, like below "OrderItems.OrderItemId" is array. You can not use "OrderItems.OrderItemId[0]" as operation in the query. Instead, you need to use "OrderItems.OrderItemId" to compare. Otherwise, it can not match one.

{
  _id: 'orderid',
  OrderItems: [
   {
     OrderItemId: ['xxxx'], 
    ... },
   {
     OrderItemId: ['yyyy'], 
    ...}, 
]

}

 result =  await collection.updateOne(
        { _id: orderId, "OrderItems.OrderItemId": [orderItemId] },
        { $set: { "OrderItems.$.imgUrl": imgUrl[0], "OrderItems.$.category": category } },
        { upsert: false },
      )
    console.log('  (result.modifiedCount) ', result.modifiedCount)
    console.log('  (result.matchedCount) ', result.matchedCount)