Convert mongo aggregate(with group and size) to query in spring data
0
sin my MongoDB I have documents like this:
{
"_id" : ObjectId("5bf3cd1c6b86db2c84d"),
"_class" : "Log",
"data" : {
"devices" : [
{
"id": "12364",
"name":"name"
},
{
"id": "12346",
"name":"name"
},
{
"id": "12345",
"name":"name"
}
]
}
}
I wanted to return number of devices, so I created query:
db.getCollection('coll').aggregate(
{$group: { _id: null, totalSize: { $sum: { $size: "$data.devices"}} }})
which returns me:
{ "_id" : null, "totalSize" : 6 }
But how to create method to return "totalSize" in Spring Data?
I get stuck and I dont know how to solve it:
public Long countDevices() {
GroupOperation groupOperation= Aggregation.group("_id").sum("_id");
Aggregation aggregation = Aggregation.newAggregation(groupOperation);
mongoOperations.aggregate(matchOperation,)
return ...
}
below solution seems to work, but its not looks so pretty and performance:
public Long count(Criteria searchCriteria) {
Aggregation aggregation = Aggregation.newAggregation(
Aggregation.match(searchCriteria),
Aggregation.unwind("data.device")
);
AggregationResults aggregationResults = mongoOperations.aggregate(aggregation,"coll", DBObject.class);
return (long) aggregationResults.getMappedResults().size();
}
spring mongodb spring-data spring-data-mongodb
asked Nov 21 '18 at 8:25
Adrian Wąt
748
add a comment |
0
sin my MongoDB I have documents like this:
{
"_id" : ObjectId("5bf3cd1c6b86db2c84d"),
"_class" : "Log",
"data" : {
"devices" : [
{
"id": "12364",
"name":"name"
},
{
"id": "12346",
"name":"name"
},
{
"id": "12345",
"name":"name"
}
]
}
}
I wanted to return number of devices, so I created query:
db.getCollection('coll').aggregate(
{$group: { _id: null, totalSize: { $sum: { $size: "$data.devices"}} }})
which returns me:
{ "_id" : null, "totalSize" : 6 }
But how to create method to return "totalSize" in Spring Data?
I get stuck and I dont know how to solve it:
public Long countDevices() {
GroupOperation groupOperation= Aggregation.group("_id").sum("_id");
Aggregation aggregation = Aggregation.newAggregation(groupOperation);
mongoOperations.aggregate(matchOperation,)
return ...
}
below solution seems to work, but its not looks so pretty and performance:
public Long count(Criteria searchCriteria) {
Aggregation aggregation = Aggregation.newAggregation(
Aggregation.match(searchCriteria),
Aggregation.unwind("data.device")
);
AggregationResults aggregationResults = mongoOperations.aggregate(aggregation,"coll", DBObject.class);
return (long) aggregationResults.getMappedResults().size();
}
spring mongodb spring-data spring-data-mongodb
asked Nov 21 '18 at 8:25
Adrian Wąt
748
add a comment |
0
0
0
sin my MongoDB I have documents like this:
{
"_id" : ObjectId("5bf3cd1c6b86db2c84d"),
"_class" : "Log",
"data" : {
"devices" : [
{
"id": "12364",
"name":"name"
},
{
"id": "12346",
"name":"name"
},
{
"id": "12345",
"name":"name"
}
]
}
}
I wanted to return number of devices, so I created query:
db.getCollection('coll').aggregate(
{$group: { _id: null, totalSize: { $sum: { $size: "$data.devices"}} }})
which returns me:
{ "_id" : null, "totalSize" : 6 }
But how to create method to return "totalSize" in Spring Data?
I get stuck and I dont know how to solve it:
public Long countDevices() {
GroupOperation groupOperation= Aggregation.group("_id").sum("_id");
Aggregation aggregation = Aggregation.newAggregation(groupOperation);
mongoOperations.aggregate(matchOperation,)
return ...
}
below solution seems to work, but its not looks so pretty and performance:
public Long count(Criteria searchCriteria) {
Aggregation aggregation = Aggregation.newAggregation(
Aggregation.match(searchCriteria),
Aggregation.unwind("data.device")
);
AggregationResults aggregationResults = mongoOperations.aggregate(aggregation,"coll", DBObject.class);
return (long) aggregationResults.getMappedResults().size();
}
spring mongodb spring-data spring-data-mongodb
asked Nov 21 '18 at 8:25
Adrian Wąt
748
sin my MongoDB I have documents like this:
{
"_id" : ObjectId("5bf3cd1c6b86db2c84d"),
"_class" : "Log",
"data" : {
"devices" : [
{
"id": "12364",
"name":"name"
},
{
"id": "12346",
"name":"name"
},
{
"id": "12345",
"name":"name"
}
]
}
}
I wanted to return number of devices, so I created query:
db.getCollection('coll').aggregate(
{$group: { _id: null, totalSize: { $sum: { $size: "$data.devices"}} }})
which returns me:
{ "_id" : null, "totalSize" : 6 }
But how to create method to return "totalSize" in Spring Data?
I get stuck and I dont know how to solve it:
public Long countDevices() {
GroupOperation groupOperation= Aggregation.group("_id").sum("_id");
Aggregation aggregation = Aggregation.newAggregation(groupOperation);
mongoOperations.aggregate(matchOperation,)
return ...
}
below solution seems to work, but its not looks so pretty and performance:
public Long count(Criteria searchCriteria) {
Aggregation aggregation = Aggregation.newAggregation(
Aggregation.match(searchCriteria),
Aggregation.unwind("data.device")
);
AggregationResults aggregationResults = mongoOperations.aggregate(aggregation,"coll", DBObject.class);
return (long) aggregationResults.getMappedResults().size();
}
spring mongodb spring-data spring-data-mongodb
spring mongodb spring-data spring-data-mongodb
asked Nov 21 '18 at 8:25
Adrian Wąt
748
asked Nov 21 '18 at 8:25
Adrian Wąt
748
asked Nov 21 '18 at 8:25
Adrian Wąt
748
asked Nov 21 '18 at 8:25
Adrian Wąt
748
asked Nov 21 '18 at 8:25
Adrian Wąt
748
748
add a comment |
add a comment |
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