对于波纹管集合,我想根据城市检索街道的分页列表;
{
{
"city" : "city 1",
"streets" : [
"street name 1",
"street name 2",
"street name 3",
"street name 4"
]
},
{
"city" : "city 2",
"streets" : [
"street name 2.1",
"street name 2.2",
"street name 2.3",
"street name 2.4"
]
},
{
"city" : "city 3",
"streets" : [
"street name 3.1",
"street name 3.2",
"street name 3.3",
"street name 3.4"
]
}
}
到目前为止,我有:
List<AggregationOperation> list = new ArrayList<AggregationOperation>();
list.add(Aggregation.unwind("streets"));
list.add(Aggregation.match(Criteria.where("city").is("city 1")));
list.add(Aggregation.group().push("streets").as("streets"));
list.add(Aggregation.project("streets"));
list.add(Aggregation.skip(0));
list.add(Aggregation.limit(2));
Aggregation agg = Aggregation.newAggregation(list);
agg.skip(0);
agg.limit(3);
return (List<String>) mongoOperations.aggregate(agg, "myCityCollection", BasicDBObject.class)
.getUniqueMappedResult().get("streets");
这将返回基于城市的街道列表,但不考虑跳过或限制。所有的街道都是城市1&#34;被检索。 是否有可能在街道上做分页?