Javascript 获取阵列中最近的位置
我有一个简单的文档,它在一个数组中有3个位置对象 数据:Javascript 获取阵列中最近的位置,javascript,mongodb,geolocation,aggregation-framework,Javascript,Mongodb,Geolocation,Aggregation Framework,我有一个简单的文档,它在一个数组中有3个位置对象 数据: { "_id" : ObjectId("57c3c479a306b3613cf1ee5b"), "location_history" : [ { "location_name" : "Area 1", "date" : 1472447609, "_id" : ObjectId("57c3c479ac5a69612f0e0899"),
{
"_id" : ObjectId("57c3c479a306b3613cf1ee5b"),
"location_history" : [
{
"location_name" : "Area 1",
"date" : 1472447609,
"_id" : ObjectId("57c3c479ac5a69612f0e0899"),
"location" : [
24.9532107, 67.1790576
]
},
{
"location_name" : "Area 2",
"date" : 1472448059,
"_id" : ObjectId("57c3c63bac5a69612f0e089c"),
"location" : [
24.9663937, 67.1462044
]
},
{
"location_name" : "Area 3",
"date" : 1472448987,
"_id" : ObjectId("57c3c9dbac5a69612f0e08a0"),
"location" : [
-24.987325, 115.1862298
]
}
}
db.getCollection('consumers_locations').aggregate([
{"$unwind": "$location_history"},
{"$match":{"_id":ObjectId("57c3c479a306b3613cf1ee5b")}},
{"$project" : { "abc" : "$location_history.location"} },
{ $geoNear: {
near: { type: "Point", coordinates: [ 24.942785, 67.157855 ] },
distanceField: "distance",
query : {"_id" : "_id"},
uniqueDocs: true,
includeLocs: "search_history.location",
maxDistance : 10000
}
}
])
{
"_id" : ObjectId("57c3c479a306b3613cf1ee5b"),
"location_history" : [
{
"location_name" : "Area 1",
"date" : 1472447609,
"_id" : ObjectId("57c3c479ac5a69612f0e0899"),
"location" : [
24.9532107, 67.1790576
]
},
{
"location_name" : "Area 2",
"date" : 1472448059,
"_id" : ObjectId("57c3c63bac5a69612f0e089c"),
"location" : [
24.9663937, 67.1462044
]
}
}
问题:我需要获取此数组中最近的位置
我尝试过的查询:
{
"_id" : ObjectId("57c3c479a306b3613cf1ee5b"),
"location_history" : [
{
"location_name" : "Area 1",
"date" : 1472447609,
"_id" : ObjectId("57c3c479ac5a69612f0e0899"),
"location" : [
24.9532107, 67.1790576
]
},
{
"location_name" : "Area 2",
"date" : 1472448059,
"_id" : ObjectId("57c3c63bac5a69612f0e089c"),
"location" : [
24.9663937, 67.1462044
]
},
{
"location_name" : "Area 3",
"date" : 1472448987,
"_id" : ObjectId("57c3c9dbac5a69612f0e08a0"),
"location" : [
-24.987325, 115.1862298
]
}
}
db.getCollection('consumers_locations').aggregate([
{"$unwind": "$location_history"},
{"$match":{"_id":ObjectId("57c3c479a306b3613cf1ee5b")}},
{"$project" : { "abc" : "$location_history.location"} },
{ $geoNear: {
near: { type: "Point", coordinates: [ 24.942785, 67.157855 ] },
distanceField: "distance",
query : {"_id" : "_id"},
uniqueDocs: true,
includeLocs: "search_history.location",
maxDistance : 10000
}
}
])
{
"_id" : ObjectId("57c3c479a306b3613cf1ee5b"),
"location_history" : [
{
"location_name" : "Area 1",
"date" : 1472447609,
"_id" : ObjectId("57c3c479ac5a69612f0e0899"),
"location" : [
24.9532107, 67.1790576
]
},
{
"location_name" : "Area 2",
"date" : 1472448059,
"_id" : ObjectId("57c3c63bac5a69612f0e089c"),
"location" : [
24.9663937, 67.1462044
]
}
}
但我得到一个错误:
{
"_id" : ObjectId("57c3c479a306b3613cf1ee5b"),
"location_history" : [
{
"location_name" : "Area 1",
"date" : 1472447609,
"_id" : ObjectId("57c3c479ac5a69612f0e0899"),
"location" : [
24.9532107, 67.1790576
]
},
{
"location_name" : "Area 2",
"date" : 1472448059,
"_id" : ObjectId("57c3c63bac5a69612f0e089c"),
"location" : [
24.9663937, 67.1462044
]
},
{
"location_name" : "Area 3",
"date" : 1472448987,
"_id" : ObjectId("57c3c9dbac5a69612f0e08a0"),
"location" : [
-24.987325, 115.1862298
]
}
}
db.getCollection('consumers_locations').aggregate([
{"$unwind": "$location_history"},
{"$match":{"_id":ObjectId("57c3c479a306b3613cf1ee5b")}},
{"$project" : { "abc" : "$location_history.location"} },
{ $geoNear: {
near: { type: "Point", coordinates: [ 24.942785, 67.157855 ] },
distanceField: "distance",
query : {"_id" : "_id"},
uniqueDocs: true,
includeLocs: "search_history.location",
maxDistance : 10000
}
}
])
{
"_id" : ObjectId("57c3c479a306b3613cf1ee5b"),
"location_history" : [
{
"location_name" : "Area 1",
"date" : 1472447609,
"_id" : ObjectId("57c3c479ac5a69612f0e0899"),
"location" : [
24.9532107, 67.1790576
]
},
{
"location_name" : "Area 2",
"date" : 1472448059,
"_id" : ObjectId("57c3c63bac5a69612f0e089c"),
"location" : [
24.9663937, 67.1462044
]
}
}
预期输出:
{
"_id" : ObjectId("57c3c479a306b3613cf1ee5b"),
"location_history" : [
{
"location_name" : "Area 1",
"date" : 1472447609,
"_id" : ObjectId("57c3c479ac5a69612f0e0899"),
"location" : [
24.9532107, 67.1790576
]
},
{
"location_name" : "Area 2",
"date" : 1472448059,
"_id" : ObjectId("57c3c63bac5a69612f0e089c"),
"location" : [
24.9663937, 67.1462044
]
},
{
"location_name" : "Area 3",
"date" : 1472448987,
"_id" : ObjectId("57c3c9dbac5a69612f0e08a0"),
"location" : [
-24.987325, 115.1862298
]
}
}
db.getCollection('consumers_locations').aggregate([
{"$unwind": "$location_history"},
{"$match":{"_id":ObjectId("57c3c479a306b3613cf1ee5b")}},
{"$project" : { "abc" : "$location_history.location"} },
{ $geoNear: {
near: { type: "Point", coordinates: [ 24.942785, 67.157855 ] },
distanceField: "distance",
query : {"_id" : "_id"},
uniqueDocs: true,
includeLocs: "search_history.location",
maxDistance : 10000
}
}
])
{
"_id" : ObjectId("57c3c479a306b3613cf1ee5b"),
"location_history" : [
{
"location_name" : "Area 1",
"date" : 1472447609,
"_id" : ObjectId("57c3c479ac5a69612f0e0899"),
"location" : [
24.9532107, 67.1790576
]
},
{
"location_name" : "Area 2",
"date" : 1472448059,
"_id" : ObjectId("57c3c63bac5a69612f0e089c"),
"location" : [
24.9663937, 67.1462044
]
}
}
使用您的模式是不可行的。索引用于对集合中的文档进行排序,而不是对文档中的子文档进行排序 考虑创建一个单独的
location\u历史记录
集合,其中引用了consumers\u locations
中的父文档。例如,对于您的对象,集合可能如下所示:
db.getCollection('location_history').insert([
{
"consumer_location": ObjectId("57c3c479a306b3613cf1ee5b"),
"location_name" : "Area 1",
"date" : 1472447609,
"_id" : ObjectId("57c3c479ac5a69612f0e0899"),
"location" : [
24.9532107, 67.1790576
]
},
{
"consumer_location": ObjectId("57c3c479a306b3613cf1ee5b"),
"location_name" : "Area 2",
"date" : 1472448059,
"_id" : ObjectId("57c3c63bac5a69612f0e089c"),
"location" : [
24.9663937, 67.1462044
]
},
{
"consumer_location": ObjectId("57c3c479a306b3613cf1ee5b"),
"location_name" : "Area 3",
"date" : 1472448987,
"_id" : ObjectId("57c3c9dbac5a69612f0e08a0"),
"location" : [
-24.987325, 115.1862298
]
}
]);
关于错误,请阅读:
您只能将$geoNear用作管道的第一阶段
因为只有第一个阶段可以从索引中受益。模式的更改将是一个很大的更改,我将它作为最后一件事保留下来。没有别的办法吗?类似于
存储的JavaScript
或任何其他东西?但它会使数据冗余@Alex Blex