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 $pull approach it works fine ! What's the difference among these approaches !
If you want to remove an array generally I use the following:
BasicDBObject match = new BasicDBObject("_id", "1"); // to match your document
BasicDBObject update = new BasicDBObject("itemList", new BasicDBObject("itemID", "1"));
coll.update(match, new BasicDBObject("$pull", update));
The remove method from template removes document. If you want to remove item from array you have to use pull. Something like
MongoOperations mongoOperations = mongoConfiguration.getMongoTemplate();
Query query = new Query(where("_id").is(docID).and("itemList.itemID").is(itemID));
Update update = new Update().pull("itemList", new BasicDBObject("itemID", "1"));
mongoOperations.updateFirst(query, update, Item.class);
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