How to check if JSON is contain in an array JSON objects in golang

user_15438469 0
Viewed 416

I have an array of JSON objects as

Structs:

type Data struct {
    TaiList []Tai `json:"taiList"`
}

type Tai struct {
    PlmnId *PlmnId `json:"plmnId"`

    Tac string `json:"tac"`

    Nid string `json:"nid"`
}

type PlmnId struct {
    Mcc string `json:"mcc"`

    Mnc string `json:"mnc"`
}

The JSON in mongodb is of the form


[
{
    "taiList": [
          {
            "plmnId": {
                "mcc": "244",
                "mnc": "24"
            },
            "tac": "00001",
            "nid": "99"
        },
        {
            "plmnId": {
                "mcc": "244",
                "mnc": "34"
            },
            "tac": "00001",
            "nid": "555"
        }
    ]
}, 
{
    "taiList": [
       {
        "plmnId": {
            "mcc": "244",
            "mnc": "24"
        },
        "tac": "00001",
        "nid": "99"
      }
    ]
}
]

The JSON "taiList" is formed after the unmarhsal from mongodb, error check intentionally omitted.

func MongoFind(id string) (Data, error) {

    filter := bson.M{"_id": id}
    var (
        result model.Data

    )
    ...
    DB.Collection(tailistCollection).FindOne(context.TODO(),filter).Decode(&result)
    ...
    return result, nil
}

The MongoFind returns Data and error. The Data.TaiList array is what i would like to perform the check.

I would like to check if the JSON object "ta" is contain in the "taiList".

 var ta = model.Tai{
    PlmnId: &model.PlmnId{Mcc: "244", Mnc: "34"},
    Tac:    "00001",
    Nid:    "555",
}

I tried with the code below

var data Data

func CheckTai(ta models.Tai, data Data) bool {
    for _, Tai := range data.TaiList {
        if reflect.DeepEqual(Tai, ta) {
            return true
        }
    }
    return false
}

but CheckTai function return false. The CheckTai only return true when there is only one JSON object that match the list as

{
      "taiList": [
        {
          "plmnId": {
            "mcc": "244",
            "mnc": "24"
          },
          "tac": "00001",
          "nid": "555"
        }

      ]
    }

Need help or idea on how to perform this check.

go json
1 Answers

Based on the suggestions from comments I replicated your scenario as follows:

package main

import (
    "encoding/json"
    "fmt"
    "log"
    "reflect"
)

type Data struct {
    TaiList []Tai `json:"taiList"`
}

type Tai struct {
    PlmnId *PlmnId `json:"plmnId"`

    Tac string `json:"tac"`

    Nid string `json:"nid"`
}

type PlmnId struct {
    Mcc string `json:"mcc"`

    Mnc string `json:"mnc"`
}

var data = []byte(`{
    "taiList": [
      {
        "plmnId": {
            "mcc": "244",
            "mnc": "24"
        },
        "tac": "00001",
        "nid": "99"
        },
        {
        "plmnId": {
            "mcc": "244",
            "mnc": "34"
        },
        "tac": "00001",
        "nid": "555"
        }
    ]
}
`)

var ta = Tai{
    PlmnId: &PlmnId{Mcc: "244", Mnc: "34"},
    Tac:    "00001",
    Nid:    "555",
}

func CheckTai(ta Tai, data Data) bool {
    for _, Tai := range data.TaiList {
        if reflect.DeepEqual(Tai, ta) {
            return true
        }
    }
    return false
}

func main() {
    var v Data
    err := json.Unmarshal(data, &v)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(CheckTai(ta, v))
}

Output:

true
user_159871470
Related