Develop Reference

Mongo Template's findAndModify is returning null values for adding or updating nested elements

My data is formatted as:
{
"_id" : "149",
"books" : {
"32" : "0.12",
"33" : "0.21"
}
}
I would like to update/insert values inside the nested books document. If I insert a new row say "39" : "0.19", then the updated document should look as below:
{
"_id" : "149",
"books" : {
"32" : "0.12",
"33" : "0.21",
"39" : "0.19"
}
}
And updates should work, the way they are meant to work. By updating the values.
I tried several ways, but couldn't update the way I wanted.
Method1: Working but wrong result
MongoCollection<Document> document = mongoTemplate.getCollection("booksCollection");
BasicDBObject query = new BasicDBObject();
query.put("_id", storeId);
BasicDBObject bookDiscount = new BasicDBObject();
bookDiscount.put(bookId, discount);
BasicDBObject update = new BasicDBObject();
update.put('$push', new BasicDBObject("books", bookDiscount));
document.findOneAndUpdate(query, update);
Method1 Output: Each value is added in a new row
{
"_id" : "1664",
"books" : [
{
"28" : NumberDecimal("0.75")
},
{
"29" : NumberDecimal("0.18")
},
{
"30" : NumberDecimal("0.23")
},
{
"245" : NumberDecimal("0.26")
},
{
"277" : NumberDecimal("0.13")
},
{
"270" : NumberDecimal("0.19")
}
]
}
Method2: Working but wrong result
MongoCollection<Document> document = mongoTemplate.getCollection("booksCollection");
BasicDBObject query = new BasicDBObject();
query.put("_id", storeId);
BasicDBObject bookDiscount = new BasicDBObject();
bookDiscount.put(bookId, discount);
BasicDBObject update = new BasicDBObject();
update.put('$set', new BasicDBObject("books", bookDiscount));
document.findOneAndUpdate(query, update);
Method2 Output: Value always gets replaced
{
"_id" : "16644158",
"locationInfRate" : {
"2857" : NumberDecimal("0.68")
},
"_class" : "com.test.books"
}

What I learned:
$push method pushes the data as a member of a list.
$set method updates the data, but for maps, it replaces data if the map is not correctly formatted in the query.
I edited my $set query to below format and it worked:
MongoCollection<Document> document = mongoTemplate.getCollection("booksCollection");
BasicDBObject query = new BasicDBObject();
query.put("_id", storeId);
BasicDBObject bookDiscount = new BasicDBObject();
bookDiscount.put("books." + bookId, discount);
update.put('$set', bookDiscount);
document.findOneAndUpdate(query, update);

Mongodb - update specific array element

I have a collection "prefs" with document structure as below
{
_id: {
userId: "abc"
},
val: {
status: 1,
prefs: [
{
value: "condition",
lastSent: ISODate("2017-07-17T23:46:53.717Z")
}
],
deal: 2,
prevDeal: 3
}
}
I am trying to update the date field lastSent with a condition on userId and status. Below are the queries that I derieved from my Java code.
Select Query:
{ "_id" : { "userId" : "abc"} , "val.status" : 1 , "val.prefs.value" : "condition"}
Update Query:
{ "$set" : { "val.prefs.$.lastSent" : { "$date" : "2017-07-17T23:50:07.009Z"}}}
The above query is giving error as follows:
The dotted field 'prefs.$.lastSent' in 'val.prefs.$.lastSent' is not valid for storage.
How do I achieve this?
Below is my Java code:
BasicDBObject _idObject = new BasicDBObject();
_idObject.put("userId", "abc");
BasicDBObject _selectQuery = new BasicDBObject();
_selectQuery.put("_id", _idObject);
_selectQuery.put("val.status", 1);
_selectQuery.put("val.prefs.value", "condition");
BasicDBObject _valueUpdateQuery = new BasicDBObject();
_valueUpdateQuery.put("prefs.$.lastSent", lastSent);
BasicDBObject _updateQuery = new BasicDBObject();
_updateQuery.put("$set", new BasicDBObject("val", _valueUpdateQuery));
prefs.update(_selectQuery, _updateQuery, true, true);

I just tested with your code in mongo shell this codes works fine you don't have to mention
$date
and i used this code for updating date
db.getCollection('tester').update({ "_id" : { "userId" : "abc"} , "val.status" : 1 , "val.prefs.value" : "condition"},{ "$set" : { "val.prefs.$.lastSent" : new Date()}})

Query from Vava to MongoDB: find event in a specific date range

I've got the following document in MongoDB:
{
"_id" : NumberLong(44),
"_class" : "la.test.app.server.model.Event",
"orgId" : NumberLong(2),
"typeCode" : 1,
"title" : "Test for notification",
"shortDescription" : "Test for notification",
"description" : "Test for notification",
"price" : "100",
"startDate" : ISODate("2015-02-08T16:30:07.000Z"),
"endDate" : ISODate("2015-02-09T16:00:07.000Z"),
"deleted" : false
}
I need to find this event among all others.
I'm trying to do such a simple thing with method:
public List<Event> getPendingEvents(Date start, Date end) {
return mongoOperations.find(
Query.query(Criteria
.where("startDate").gte(start).lte(end)
.and("typeCode").is("1")),
Event.class
);
That assembles and returns me query:
{
"startDate" : { "$gte" : { "$date" : "2015-02-08T05:29:00.000Z"} ,
"$lte" : { "$date" : "2015-02-08T05:31:00.000Z"}} ,
"typeCode":"1"
}
And this query finds just "Fields: null, Sort: null":
But a direct query to MongoDB:
db.events.find({
"startDate" : {"$gte" : ISODate("2015-02-08 16:30:07.000Z"),
"$lt" : ISODate("2015-02-08 16:31:07.000Z")},
"typeCode" : 1})
Finds the required event.

Did you tried by formating the date by using SimpleDateFormat...?
I had tried this long back...
// Find documents by date of birth
Date gtDate = null;
try {
gtDate = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS").parse("1984-05-010T8:30:00.000Z");
} catch (ParseException e) {
e.printStackTrace();
}
BasicDBObject dateQueryObj = new BasicDBObject("DateOfBirth", new BasicDBObject("$lt", gtDate));
cursor = documents.find(dateQueryObj);
while(cursor.hasNext()) {
System.out.println("\n Find documents by date of birth. \n");
System.out.println(cursor.next());
}

Same problem was solved by using BasicDBObject instead of a mongoOperations intreface.
Something like that:
BasicDBObject query = new BasicDBObject();
query = new BasicDBObject("endDate", new BasicDBObject("$gte", start).append("$lte", end)).append("typeCode", 1);
List<DBObject> result = collection.find(query).toArray();

MongoDB Array modify Using Java

I am new to MongoDB, I want to remove an element from array structure as shown below:
{
"Data" : [
{
"url" : "www.adf.com"
"type":7
},
{
"url" : "www.pqr.com"
"type":2
}
{
"url" : "www.adf.com"
"type":3
},
{
"url" : "www.pqr.com"
"type":5
}
],
}
I want to remove url=www.adf.com which has type as lowest values i.e in this document my query should remove type=3 and return document as below:
{
"Data" : [
{
"url" : "www.adf.com"
"type":7
},
{
"url" : "www.pqr.com"
"type":2
}
{
"url" : "www.pqr.com"
"type":5
}
],
}

The query shown by #shakthydoss can be described in java as follows:
MongoClient mongoClient = new MongoClient("SERVER", 27017);
DB db = mongoClient.getDB("DB_NAME");
DBCollection coll1 = db.getCollection("COLLECTION_NAME");
DBObject eleMatch = new BasicDBObject();
eleMatch.put("url", "www.pqr.com");
eleMatch.put("type", new BasicDBObject("$lte", 50));
BasicDBObject up = new BasicDBObject();
up.put("$elemMatch", eleMatch);
BasicDBList basicDBList = new BasicDBList();
basicDBList.add(up);
DBObject query = new BasicDBObject("Data", new BasicDBObject(" $all", basicDBList));
coll1.find(query);

Use $all with $elemMatch
If the field contains an array of documents, you can use the $all with the $elemMatch operator.
db.inventory.find( {
Data: { $all: [
{ "$elemMatch" : { url : "www.pqr.com": "M", type: { $lte: 50} } },
] }
} )

MongoDb accesing nested documents in java

I am new to MongoDB. I am trying to access nested doc in mongodb. My sample doc is
{
"Advertisement" : {
"html" : "zxcxz"
},
"Notification" : {
"date_from" : ISODate("2013-06-30T18:30:00Z"),
"date_too" : ISODate("2013-07-16T18:30:00Z"),
"description" : "vcvc",
"url" : "vcvc"
},
"_id" : ObjectId("51e4f10ee4b08e0a6ebcbe46"),
"group_name" : "sumit",
"target_audience" : {
"gender" : "male",
"section" : "xyz",
"catagory" : "--Computer--",
"location" : {
"country" : "--Country--",
"state" : "--State--",
"city" : "--City--"
}
}
}
I am trying to get gender from target_audience. My java code is
DBCursor f=con.coll.find(query);
while(f.hasNext())
{
f.next();
gender=(String) f.curr().get("target_audience.gender");
}
But it returns null.

The result of DBCursor.next() and DBCursor.curr() is a BasicDBObject. For keys with embedded documents, BasicDBObject.get(key) returns a BasicDBObject
DBCursor f=con.coll.find(query);
while(f.hasNext())
{
BasicDBObject result = (BasicDBObject) f.next();
BasicDBObject target = (BasicDBObject) result.get("target_audience");
gender = (String) target.get("gender");
}