MongoTemplate pull query - java

I am trying to remove one Item from an array of an embedded field in mongoDb. Array is type of string like the below one.
{
_id: 1,
fruits: [ "apples", "pears", "oranges", "grapes", "bananas" ],
vegetables: [ "carrots", "celery", "squash", "carrots" ]
}
{
_id: 2,
fruits: [ "plums", "kiwis", "oranges", "bananas", "apples" ],
vegetables: [ "broccoli", "zucchini", "carrots", "onions" ]
}
I just wanted to remove the carrots from the embedded array vegetables. using mongo shell, the below query works
db.stores.update(
{ },
{ $pull: { vegetables: "carrots" },
{ multi: true }
)
Now I needed to perform this using mongoTemplate in spring,
I tried with the below answer but it wont remove the element
MongoTemplate pull subdocument.
Can anyone suggest How I to achieve this using mongoTemplate in spring project


You can simply use the below query to pull any string in the array of vegetables object:
mongoTemplate.updateMulti(new Query(), new Update().pull("vegetables", "squash"), "stores");
In the above query, squash will be pulled after execution. For details, I have also added find query on stores collections after and before the above query as :
List<Stores> storesList = mongoTemplate.find(new Query(), Stores.class);
for(Stores stores : storesList) {
System.out.println(stores.toString());
}
mongoTemplate.updateMulti(new Query(), new Update().pull("vegetables", "squash"), "stores");
List<Stores> afterModificationStoresList = mongoTemplate.find(new Query(), Stores.class);
for(Stores stores : afterModificationStoresList) {
System.out.println(stores.toString());
}
The output is as below :
2019-11-26 10:19:57.947 DEBUG 7321 --- [ main] o.s.data.mongodb.core.MongoTemplate : find using query: { } fields: Document{{}} for class: class sample.data.mongo.models.Stores in collection: stores
Stores{id='1.0', fruits=[apples, pears, oranges, grapes, bananas], vegetables=[celery, squash]}
Stores{id='2.0', fruits=[plums, kiwis, oranges, bananas, apples], vegetables=[broccoli, zucchini, onions]}
2019-11-26 10:19:57.975 DEBUG 7321 --- [ main] o.s.data.mongodb.core.MongoTemplate : Calling update using query: { } and update: { "$pull" : { "vegetables" : "squash" } } in collection: stores
2019-11-26 10:19:57.985 DEBUG 7321 --- [ main] o.s.data.mongodb.core.MongoTemplate : find using query: { } fields: Document{{}} for class: class sample.data.mongo.models.Stores in collection: stores
Stores{id='1.0', fruits=[apples, pears, oranges, grapes, bananas], vegetables=[celery]}
Stores{id='2.0', fruits=[plums, kiwis, oranges, bananas, apples], vegetables=[broccoli, zucchini, onions]}
For code details, kinldy visit by Github repo: https://github.com/krishnaiitd/learningJava/blob/master/spring-boot-sample-data-mongodb/src/main/java/sample/data/mongo/main/Application.java#L126

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I need to retrieve MongoDB's object just with filtered's array item

I'm needing to retrieve just with two dates, all the documents from my MongoDB's collection, with the filtered items from the array.
This is an example of 2 of my documents;
{
"_id" : ObjectId("5f18fa823406b7000132d097"),
"last_date" : "22/07/2020 23:48:32",
"history_dates" : [
"22/07/2020 23:48:32",
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"23/07/2020 01:19:30"
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"hostname" : "MyHostname1",
"ip" : "142.0.111.79",
"component" : "C:\\Windows\\System32\\es-ES\\KernelBase.dll.mui",
"process" : "LogonUI.exe",
"date" : "23/07/2020 10:26:04",
}
{
"_id" : ObjectId("5f18fa823406b7000132d098"),
"last_date" : "22/07/2020 23:48:33",
"history_dates" : [
"22/07/2020 23:48:33",
"23/07/2020 00:18:53",
],
"hostname" : "MyHostName2",
"ip" : "142.0.111.54",
"component" : "C:\\Windows\\System32\\es-ES\\KernelBase.dll.mui",
"process" : "svchost.exe",
"date" : "23/07/2020 10:26:04",
}
I'm needing to make a find to my database (Using Spring Data), to retrieve the same objects, but with the "history_dates"'s array filtered between the 2 dates recieved.
For example, if my 2 recieved dates are: "23/07/2020" and "24/07/2020", I want MongoDB to return the next objects;
{
"_id" : ObjectId("5f18fa823406b7000132d097"),
"last_date" : "22/07/2020 23:48:32",
"history_dates" : [
"23/07/2020 00:49:12",
"23/07/2020 01:19:30"
],
"hostname" : "MyHostname1",
"ip" : "142.0.111.79",
"component" : "C:\\Windows\\System32\\es-ES\\KernelBase.dll.mui",
"process" : "LogonUI.exe",
"date" : "23/07/2020 10:26:04",
}
{
"_id" : ObjectId("5f18fa823406b7000132d098"),
"last_date" : "22/07/2020 23:48:33",
"history_dates" : [
"23/07/2020 00:18:53"
],
"hostname" : "MyHostName2",
"ip" : "142.0.111.54",
"component" : "C:\\Windows\\System32\\es-ES\\KernelBase.dll.mui",
"process" : "svchost.exe",
"date" : "23/07/2020 10:26:04",
}
I'm really ignorant about MongoDB's queries, and I have been trying to make this with Spring Data all the week.
UPDATE 1.
Thanks varman, and do you know how can i just retrieve the documents with filtered arrays not empty?

So basically you need to do filter. MongoTemplate offers a lot of operation for mongodb, if some methods don't exist in MongoTemplate, we can go with Bson Document pattern. In that case, try this article: Trick to covert mongo shell query.
Actually you need a Mongo query something like following. Using $addFields one of the methods shown below. But you can use $project, $set etc. Here $addFields overwrites your history_dates. (It uses to add new fields to document too).
{
$addFields: {
history_dates: {
$filter: {
input: "$history_dates",
cond: {
$and: [{
$gt: ["$$this", "23/07/2020"]
},
{
$lt: ["$$this", "24/07/2020"]
}
]
}
}
}
}
}
Working Mongo playground.
You need to convert this into spring data. So #Autowired the MongoTemplate in you class.
#Autowired
MongoTemplate mongoTemplate;
The method is,
public List<Object> filterDates(){
Aggregation aggregation = Aggregation.newAggregation(
a->new Document("$addFields",
new Document("history_dates",
new Document("$filter",
new Document("input","$history_dates")
.append("cond",
new Document("$and",
Arrays.asList(
new Document("$gt",Arrays.asList("$$this","23/07/2020")),
new Document("$lt",Arrays.asList("$$this","24/07/2020"))
)
)
)
)
)
)
).withOptions(AggregationOptions.builder().allowDiskUse(Boolean.TRUE).build());
return mongoTemplate.aggregate(aggregation, mongoTemplate.getCollectionName(YOUR_CLASS.class), Object.class).getMappedResults();
}
Mongo template doesn't provide add methods for $addFields and $filter. So we just go with bson document pattern. I haven't tested this in Spring.

Trim the redundant data

I want to delete the data on the date basis(which is present inside the array). This is how my mongo document looks like.
{
"_id" : ObjectId("5d3d94df83f68f8bf751f367"),
"branchName" : "krishYogaCenter",
"Places" : [
"Pune",
"Bangalore",
"Hyderabad",
"Delhi"
],
"rulesForDateRanges" : [
{
"fromDate" : ISODate("2019-01-07T18:30:00.000Z"),
"toDate" : ISODate("2019-03-06T18:30:00.000Z"),
"place" : "Delhi",
"ruleIds" : [
5,
6,
7
]
},
{
"fromDate" : ISODate("2019-03-07T18:30:00.000Z"),
"toDate" : ISODate("2019-05-06T18:30:00.000Z"),
"place" : "Hyderabad",
"ruleIds" : [
1,
2
]
}
],
"updatedAt" : ISODate("2019-07-28T12:31:35.694Z"),
"updatedBy" : "Theia"
}
Here, if "toDate" is less than today I want to delete that object from the array "rulesForDateRanges". Searched on the google but did not get any way to do this in morphia.
If this date was not present internally in the array object then I could have used "delete document where the date is less than today". Here I want to remove that object from the array which is in no longer use, and if the array "rulesForDateRanges" becomes empty in that case only want to delete the whole document.
I am using morphia. Please suggest the way to do this in morphia or the query to do this.
Searched on google got this: We can get the document one by one from the collection using query and do UpdateOperation over that document. But here I have to perform updateOperation for each and every document.

Correct structure and query for Realtime Firebase Database

How can I structure my database in Firebase for search for recipes? Each recipe have some ingridients. I need to search for recipes. If the query contains several matching ingredients, I need to output a recipe containing a matching value.
It is my strucuture of database now :
{
"Recepts" : [ {
"Ingridients" : [ "Carrot", "Sugar" ],
"Name" : "Carrot Salad"
}, {
"Ingridients" : [ "Orange", "Milk" ],
"Name" : "Orange Milk"
} ]
}
If this is correct, how can I do a query for my database?

It is a best practice to avoid using array and save list of data as map instead.
To search for recipes having an ingredient, you could use orderByChild together with equalTo the ingredient you are looking for.
The data structure would be
{
"Recipes" : {
"CarrotSalad": {
"Ingredients" : {
"Carrot": true,
"Sugar": true
},
"Name" : "Carrot Salad"
},
....
}
}

MongoDB JSON array within JSON object field removal

I have a json object as following:
{ "_id" : ObjectId("508806803bb97dc546e6f307"), "user_name" : "user1", "user_id" : 45645645, "likes" : [ { "event_id" : NumberLong("4578541212") },{ "event_id" : NumberLong("4578541213") } ], "dislikes" : [ ] }
I'm trying to delete specific event within likes array via java drivers
tried doing this first in shell:
> db.users.update( {'likes.event_id' : 4578541212}, { '$unset':{'likes.event_id'
:1}})
with no luck...how can I manage doing that?

If you want to just remove the event_id field from the array element:
db.users.update( {'likes.event_id' : 4578541212}, {'$unset':{'likes.$.event_id' :1}})
Use the $pull operator to delete the element:
db.users.update({'likes.event_id': 4578541212}, {'$pull':{likes: {event_id: 4578541212}}})

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