如何使用golang创建嵌套的json数组对象

Question

I try to query database and use query result to create json like these

[ {"TransID": "Transaction ID1",ProductID": ["ProID1","ProID2","ProID3","ProID4" ]},

{"TransID": "Transaction ID2","ProductID": ["ProID5","ProID6" ]} ]

so I create type struct from

type DataRecent []struct {
 TransID   string   `json:"transID"`
 ProductID []string `json:"productID"`}

and golang code is

var dataRecent DataRecent
var recent [5]string
for _, Trans := range recent {

    if Trans != "" {
        var TransID, ProductID string

        selectTrans, err := db.Query("select transaction_id, product_id from detail where transaction_id = ?", Trans)

        var arr []string
        for selectTrans.Next() {
            if err != nil {
                panic(err.Error())
            }
            errTrans := selectTrans.Scan(&TransID, &ProductID)
            if errTrans != nil {
                panic(errTrans.Error())
            }
            arr = append(arr, ProductID)
        }
    }
        dataRecent.TransID = Trans
        dataRecent.ProductID = arr

}
    c.JSON(http.StatusOK, gin.H{"status": "success", "message": "Find transactions success", "recent_trans": dataRecent})


defer db.Close()

but I can't build the code and got error

dataRecent.TransID undefined (type DataRecent has no field or method TransID) dataRecent.ProductID undefined (type DataRecent has no field or method ProductID)

I don't know what to do and stuck with these for a week. I am new programmer for golang. Help me pleae, Thank you

Answer 1

Just remove the array when you create the struct

type DataRecent struct {
 TransID   string   `json:"transID"`
 ProductID []string `json:"productID"`
}

and do

var dataRecent []DataRecent

it will works for you.