Convert MongoDB query into Spring MongoDB syntax - spring

Question

Hello I am unable to convert the following mongoDB query into spring query, i have tried multiple ways, but did not get the result.
db.getCollection('FarmerCropDataLog').aggregate([
{
"$match" :
{
"cropData.crop" : "RICE",
"creationTime" :
{
$lt : 1551447981473.0
}
}
},
{
"$group" :
{
_id : null,
"average" :{
$avg : "$cropData.cropPrice"
},
"max" :{
$max : "$cropData.cropPrice"
},
"min":{
$min : "$cropData.cropPrice"
}
}
}
])
I have written follwing code, but unable to think about next step.
Query query = new Query();
query.addCriteria(Criteria.where(FarmerCropDataLog.Constants.CROP_LOG).elemMatch(Criteria.where(CropData.Constants.CROP).is(getComparisonSheet.getCrop())));
query.addCriteria(Criteria.where(FarmerCropDataLog.Constants.CREATION_TIME).gt(Year * DIFF));

Answer 1

Have you ever thought about using MongoDB compass? It will make your work very simple.
Open MongoDB compass connect to your instance
Aggregation tab, construct your pipeline
click on the 3 dots(...) next to save pipeline option
Select export to language and select Java
Your query is ready
Here is the java query
Arrays.asList(match(and(eq("cropData.crop", "RICE"), lt("creationTime", 1551447981473.0d))), group(new BsonNull(), avg("average", "$cropData.cropPrice"), max("max", "$cropData.cropPrice"), min("min", "$cropData.cropPrice")))

Answer 2

If you've used JpaRepository then it's easy to relate that you can create an interface and extends MongoRepository just like with JpaRepository and it provides some simple method, and you don't need the implement it.
you can use (for example consider A Person with First and Last name)
MongoDB JSON based query methods and field restriction
public interface PersonRepository extends MongoRepository<Person, String>
#Query(value="{ 'firstname' : ?0 }", fields="{ 'firstname' : 1, 'lastname' : 1}")
List<Person> findByThePersonsFirstname(String firstname);
}
Geo-spatial repository queries
public interface PersonRepository extends MongoRepository<Person, String>
// { 'location' : { '$near' : [point.x, point.y], '$maxDistance' : distance}}
List<Person> findByLocationNear(Point location, Distance distance);
}
Read the Spring document here for MongoDB repositories