How to apply update using Filtered positional operator with arrayFilters

问题

I am running on Mongodb 3.6, with mongo driver 3.4.3 and spring data mongo 1.5.10. Below is the structure of my document

{
  "_id": 12345,
  "_class": "com.example.ProductRates",
  "rates": [
    {
      "productId": NumberInt(1234),
      "rate": 100.0,
      "rateCardId": NumberInt(1),
      "month": NumberInt(201801)
    },
    {
      "productId": NumberInt(1234),
      "rate": 200.0,
      "rateCardId": NumberInt(1),
      "month": NumberInt(201802)
    },
    {
      "productId": NumberInt(1234),
      "rate": 400.0,
      "rateCardId": NumberInt(2),
      "month": NumberInt(201803)
    },
    {
      "productId": NumberInt(1235),
      "rate": 500.0,
      "rateCardId": NumberInt(1),
      "month": NumberInt(201801)
    },
    {
      "productId": NumberInt(1235),
      "rate": 234,
      "rateCardId": NumberInt(2),
      "month": NumberInt(201803)
    }
  ]
}

am trying to do bulk update on the data as shown below

db.rates.update(
  { "_id" : 1234 },
  { $set: { "rates.$[item].rate": 200  } },
  { multi: true, 
   arrayFilters: [ { "item.rateCardId": {$in: [ 1, 2]} } ]
  }
)

Now and trying to convert this code to java. Below is the code i was able to achieve for a bulk update case. As expected the below query is updating all the document due to the usage of $[]. Am trying to figure out how to apply array filters here using positional array update operators (like $[one] ).

WriteResult wr = getMongoTemplate().updateMulti(
            new Query(where("rates.rateCardId").is(1234)),
            new Update().set("rates.$[].rate", 200),
            ProductRates.class);

Also I could not find enough tutorials or documentation that suggests how to apply all the complex mongo queries in Java. please suggest if there are any good books or tutorial i can refer to.

回答1:

That should be:

WriteResult wr = getMongoTemplate().updateMulti(
  new Query(where("rates.rateCardId").is(1234)),
  new Update().set("rates.$[item].rate", 200),
  new UpdateOptions()
    .arrayFilters(
      Arrays.asList( Filters.in("item.rateCardId",Arrays.asList(1,2)) )
    ), 
  ProductRates.class
);

You need to make sure the underlying Java Driver is a 3.6.x version or greater in order to have the arrayFilters() and likely even to support the addition of UpdateOptions()

回答2:

I found Neil's answer useful in solving this problem, but I wanted to offer a slightly different call than the one in his code snippet.

getMongoTemplate().getCollection("ProductRates").updateMany(
    new Document().append("rates.rateCardId", 1234),
    new Document().append("$set", new Document().append("rates.$[item].rate", 200)),
    new UpdateOptions()
        .arrayFilters(
            Collections.singletonList( Filters.in("item.rateCardId",
                                                 Arrays.asList(1,2)) ))
);

来源：https://stackoverflow.com/questions/49906270/how-to-apply-update-using-filtered-positional-operator-with-arrayfilters