如何$嵌套數組中的golang？

我嘗試使用$push推送嵌套數組中的一些數據。這是我的JSON文件

{ 
    "_id" : ObjectId("57307906f051147d5317984e"), 
    "user" : [ 
     { 
      "firstName" : "chetan", 
      "lastName" : "kumar", 
      "age" : 23, 
      "sales" : [ 
       { 
      "firstName" : "ashu", 
      "lastName" : "jha", 
      "age" : 27 
       } 
      ], 
     }, 
     { 
      "firstName" : "nepolean", 
      "lastName" : "dang", 
      "age" : 26 
     }, 
     { 
      "firstName" : "Raj", 
      "lastname" : "kumar", 
      "age" : 26 
     } 
    ], 

}

現在，這裏是我想在這裏我golang代碼來執行

package main 

import(
    "fmt" 
    "log" 
    "net/http" 
     //"encoding/json" 
    "github.com/gorilla/mux" 
     "gopkg.in/mgo.v2" 
     "gopkg.in/mgo.v2/bson" 
) 
type User struct{ 
    SALES  []Sales  `json:"sales" bson:"sales"` 
    FIRSTNAME string  `json:"firstName" bson:"firstName"` 
    LASTNAME string  `json:"lastName" bson:"lastName"` 
    AGE  int  `json:"age" bson:"age"` 
} 
type Sales struct{ 
    FIRSTNAME string  `json:"firstName" bson:"firstName"` 
    LASTNAME string  `json:"lastName" bson:"lastName"` 
    AGE  int  `json:"age" bson:"age"` 
} 

type Details struct{ 
    ID bson.ObjectId `json:"_id" bson:"_id"` 
    USER []User  `json:"user" bson:"user"` 

} 


func detail(w http.ResponseWriter, r *http.Request){ 
    session, err := mgo.Dial("127.0.0.1") 
     if err != nil { 
       panic(err) 
     }else{ 
       fmt.Println("dial") 
     } 
     defer session.Close() 


     session.SetMode(mgo.Monotonic, true) 

     c := session.DB("userdb").C("user") 
     addsales:= []Sales{Sales{ 
      FIRSTNAME : "chetan", 
      LASTNAME : "kumar", 
      AGE : 24, 
      }, 
     } 
    fmt.Println(addsales) 
    match := bson.M{"firstName" : "nepolean"} 
    change := bson.M{"$push":bson.M{"user.$.sales":addsales}} 
    err = c.Update(match,change) 
    if err !=nil{ 
     panic(err)  
    }else{ 
    fmt.Println("success") 
    } 
} 

func main(){ 
    router := mux.NewRouter().StrictSlash(true) 
    router.HandleFunc("/detail",detail) 
    log.Fatal(http.ListenAndServe(":9080", router)) 

}

這裏，是我的輸出執行

/Desktop$ go run arrayupdate.go dial [{chetan kumar 24}] 2016/05/24 
12:39:48 http: panic serving 127.0.0.1:43928: not found goroutine 5 
[running]: net/http.(*conn).serve.func1(0xc820082200) 
    /usr/local/go/src/net/http/server.go:1389 +0xc1 panic(0x7c6bc0, 
0xc82000b080) /usr/local/go/src/runtime/panic.go:426 +0x4e9 
main.detail(0x7f4a62bf9900, 0xc8200735f0, 0xc8200d6000) 
    /home/joybynature/Desktop/arrayupdate.go:93 +0x7a6 
net/http.HandlerFunc.ServeHTTP(0x91d9f0, 0x7f4a62bf9900, 0xc8200735f0, 
0xc8200d6000) /usr/local/go/src/net/http/server.go:1618 +0x3a 
github.com/gorilla/mux.(*Router).ServeHTTP(0xc820012550, 
0x7f4a62bf9900, 0xc8200735f0, 0xc8200d6000) 
    /home/joybynature/src/github.com/gorilla/mux/mux.go:107 +0x285 
net/http.serverHandler.ServeHTTP(0xc820082180, 0x7f4a62bf9900, 
0xc8200735f0, 0xc8200d6000) /usr/local/go/src/net/http/server.go:2081 
+0x19e net/http.(*conn).serve(0xc820082200) /usr/local/go/src/net/http/server.go:1472 +0xf2e created by 
net/http.(*Server).Serve /usr/local/go/src/net/http/server.go:2137 
+0x44e

來源

2016-05-24 Chetan Kumar

您正在推動一個陣列中後的Sales與單個項目的語法。
它應該是單一Sales對象推：

addsales:= Sales{ 
    FIRSTNAME : "chetan", 
    LASTNAME : "kumar", 
    AGE : 24, 
}, 
change := bson.M{"$push":bson.M{"user.$.sales":addsales}}

或使用改性劑$each推多個項目：

addsales:= []Sales{Sales{ 
    FIRSTNAME : "chetan", 
    LASTNAME : "kumar", 
    AGE : 24, 
    }, 
} 
change := bson.M{"$push":bson.M{"user.$.sales":bson.M{"$each":addsales}}}

來源

2016-05-24 08:49:29

addsales:= []Sales{Sales{ 
      FIRSTNAME : "chetan", 
     LASTNAME : "kumar", 
     AGE : 24, 
      }, 
     } 

    match := bson.M{"user.firstName" : "nepolean"} 
    change := bson.M{"$push":bson.M{"user.$.sales":bson.M{"$each":addsales}}} 


    err = c.Update(match,change) 
    if err !=nil{ 
     panic(err)  
    }else{ 
    fmt.Println("success") 
    }

來源

2016-05-24 13:27:01

如何$嵌套數組中的golang？

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