我想查询我的movieStyle这是一个数组。
我认为我使用的关键词是aggregate $map $filter input as cond
我在Robo3T中使用查询命令：
db.getCollection('Tainan').aggregate([
{
"$project": {
theater: true,
theaterCn: true,
movie: {
$filter: {
input: {
$map: {
input: "$movie",
as: "movie",
in: {
cnName: "$$movie.cnName",
enName: "$$movie.enName",
versionType: "$$movie.versionType",
movieStyle: {
$filter: {
input: "$$movie.movieStyle",
as: "movieStyle",
cond: { $eq: [ "$$movieStyle", '動作' ] }
}
}
}
}
},
}
}
}
}
])
但是我得到了错误：
Error:
Assert: command failed: {
"ok" : 0,
"errmsg" : "Missing 'cond' parameter to $filter",
"code" : 28650,
"codeName" : "Location28650"
} : aggregate failed
为什么？我过滤我的movie.movieStyle会出错吗？
这是我的数据结构：
{
"_id" : ObjectId("5bc6af1ce9427ea77e75eacc"),
"theater" : "TodayTainan",
"geometry" : {
"type" : "Point",
"coordinates" : [
120.196866,
22.99322
]
},
"movie" : [
{
"movieStills" : [
"https://movies.yahoo.com.tw/x/r/w340/i/o/production/movie-photos/January2018/VOTtTo0hq2Sc0ncv8xYE-1000x667.jpg"
],
"videoId" : [
"rUAri_35CIA",
"gV6cD1iUp_0"
],
"imdbScore" : "7.3",
"cnName" : "蟻人與黃蜂女",
"versionType" : "數位",
"movieStyle" : [
"\n 動作\n ",
"\n 科幻\n "
],
"rottenScore" : "88%",
"releasedTime" : [
ISODate("2018-10-17T13:10:00.000Z"),
ISODate("2018-10-17T17:30:00.000Z"),
ISODate("2018-10-17T21:40:00.000Z")
],
"movieTime" : "片 長：01時59分",
"movieActorPhoto" : [
"https://movies.yahoo.com.tw/x/r/h290/i/o/production/names/May2018/P7wuxMUcAILicv9huTkf-2790x2790.jpg"
],
"movieActorCn" : [
"保羅路德",
"伊凡潔琳莉莉"
],
"movieDate" : "date：2018-07-04",
"enName" : "Ant-Man and the Wasp",
"movieContent" : "some content",
"photoHref" : "https://movies.yahoo.com.tw/x/r/w420/i/o/production/movies/May2018/nJipiMxyde97aeNbkGkJ-1045x1500.jpg"
},
{
"movieStills" : [
"https://movies.yahoo.com.tw/x/r/w340/i/o/production/movie-photos/May2018/Hnk8uVTwSAN50pDZt6gc-2160x900.jpeg"
],
"videoId" : [
"utddeo-pulY",
"krd8J_clTyo"
],
"imdbScore" : "5.9",
"cnName" : "摩天大樓",
"versionType" : "數位",
"movieStyle" : [
"\n 動作\n ",
"\n 懸疑/驚悚\n "
],
"rottenScore" : "46%",
"releasedTime" : [
ISODate("2018-10-17T11:10:00.000Z"),
ISODate("2018-10-17T15:20:00.000Z"),
ISODate("2018-10-17T19:40:00.000Z")
],
"movieTime" : "片 長：01時43分",
"movieActorPhoto" : [
"https://movies.yahoo.com.tw/x/r/h290/i/o/production/names/June2017/o1hsVz7VPYYYEs0YuYvX-2131x3500.jpg"
],
"movieActorCn" : [
"巨石強森",
"帕布羅薛伯"
],
"movieDate" : "date：2018-07-12",
"enName" : "Skyscraper",
"movieContent" : "some content",
"photoHref" : "https://movies.yahoo.com.tw/x/r/w420/i/o/production/movies/May2018/sy8K5jWAfeiqv9wH25uI-947x1500.JPG"
}
],
"phone" : "06-2205151",
"address" : "some address",
"theaterCn" : "Today theater"
}
任何帮助将不胜感激。预先感谢。
这是我关于$filter releasedTime的代码，它可以正常工作。我只是想不通为什么我不能$filter movieStyle
db.getCollection('Tainan').aggregate([
{
"$project": {
theater: true,
theaterCn: true,
movie: {
$filter: {
input: {
$map: {
input: "$movie",
as: "movie",
in: {
cnName: "$$movie.cnName",
enName: "$$movie.enName",
versionType: "$$movie.versionType",
releasedTime: {
$filter: {
input: "$$movie.releasedTime",
as: "movie",
cond: { $and: [
{$gte: [ "$$movie", 2018-10-17 10:20:00.000Z`) ]},
{$lte: [ "$$movie", 2018-10-17 22:20:00.000Z`) ]}
]}
}
}
}
}
},
as: "movie",
cond: "$$movie"
}
}
}
}
])
答案 0 :(得分：1)
您可以尝试以下汇总
您的movieStyle数组中的元素包含/n。您可以使用$trim聚合删除它们。
db.collection.aggregate([
{ "$project": {
"theater": true,
"theaterCn": true,
"movie": {
"$filter": {
"input": {
"$map": {
"input": "$movie",
"as": "movie",
"in": {
"cnName": "$$movie.cnName",
"enName": "$$movie.enName",
"versionType": "$$movie.versionType",
"movieStyle": {
"$filter": {
"input": "$$movie.movieStyle",
"as": "movieStyle",
"cond": {
"$eq": [
{ "$trim": { "input": "$$movieStyle" }},
"動作"
]
}
}
}
}
}
},
"as": "movie",
"cond": "$$movie"
}
}
}}
])