Remove an entry from array using MongoDB-Java driver
java, mongodb, spring
Solution
If you want to remove an array generally I use the following:
BasicDBObject match = new BasicDBObject("_id", "1"); // to match your document
BasicDBObject update = new BasicDBObject("itemList", new BasicDBObject("itemID", "1"));
coll.update(match, new BasicDBObject("$pull", update));
Problem
I have JSON like : ``` { "_id" : "1", "_class" : "com.model.Test", "itemList" : [ { "itemID" : "1", "itemName" : "Foo", "resources" : [ { "resourceID" : "1", "resourceName" : "Foo Test1" }, { "resourceID" : "2", "resourceName" : "Foo Test2" } ] } ] } ``` I need to be able to remove one of records of itemList. I have done the following: ``` public void removeItemByID(String docID, String itemID) throws Exception { MongoOperations mongoOperations = mongoConfiguration.getMongoTemplate(); Query query = new Query(where("_id").is(docID).and("itemList.itemID").is(itemID)); mongoOperations.remove(query, Item.class); ``` } This approach doesn't work. However when I have used the BasicDBObject with $pull approach it works fine ! What's the difference among these approaches !