从 Go 中的地图创建具有多个嵌套对象的单个 json 对象

Question

如果我的问题措辞不当，我们深表歉意。我是 Go 的新手，正在尝试使用封送处理将一些数据格式化为 JSON。我的函数看起来像：

func writeJSON(w http.ResponseWriter, rep similarity.Similarity, keys []string) {
    for _, sub := range rep.Submissions {
        var jsonMap = make(map[string]interface{})
        vals := makeRow(sub)
        for i := range vals {
            jsonMap[keys[i]] = vals[i]
        }
        jsonData, err := json.Marshal(jsonMap)
        if err != nil {
            zap.L().Error(err.Error())
        }
        w.Write(jsonData)
    }
}

我基本上是通过为每个提交创建一个映射（sub - rep.Submission），添加我想要的键和值，并在完成后进行编组来获得 key:value 结构。但是，我得到的是单独的 json 个对象，而不是一个对象。

我当前的 json 响应格式如下所示：

{
    "correct": "false",
    "learnerId": "student_03",
    "percentScore": "0.000000",
    "solutionCode": "x = 4",
    "solutionId": "515219a8",
    "submittedTime": "03/23/2022  05:58 PM UTC",
    "testsPassed": "0",
    "totalTests": "1"
}{
    "correct": "false",
    "learnerId": "student_02",
    "percentScore": "0.000000",
    "solutionCode": "x = \"hello\";",
    "solutionId": "c5fe8f93",
    "submittedTime": "03/23/2022  05:57 PM UTC",
    "testsPassed": "0",
    "totalTests": "1"
}{
    "correct": "true",
    "learnerId": "student_01",
    "percentScore": "0.000000",
    "solutionCode": "x = 2;",
    "solutionId": "c2be6a1f",
    "submittedTime": "03/23/2022  05:43 PM UTC",
    "testsPassed": "1",
    "totalTests": "1"
}

我想要这样的东西：

{
    {
        "correct": "false",
        "learnerId": "student_03",
        "percentScore": "0.000000",
        "solutionCode": "x = 4",
        "solutionId": "asdad",
        "submittedTime": "03/23/2022  05:58 PM UTC",
        "testsPassed": "0",
        "totalTests": "1"
    },
    {
        "correct": "false",
        "learnerId": "student_02",
        "percentScore": "0.000000",
        "solutionCode": "x = \"hello\";",
        "solutionId": "asdasd",
        "submittedTime": "03/23/2022  05:57 PM UTC",
        "testsPassed": "0",
        "totalTests": "1"
    },
    {
        "correct": "true",
        "learnerId": "student_01",
        "percentScore": "0.000000",
        "solutionCode": "x = 2;",
        "solutionId": "asd",
        "submittedTime": "03/23/2022  05:43 PM UTC",
        "testsPassed": "1",
        "totalTests": "1"
    }
}

我已经尝试将 jsonData, err := json.Marshal(jsonMap) 部分从 for 循环中取出，但这不起作用。我也尝试过使用 json.NewEncoder(w).Encode(jsonMap) 但这会产生与封送处理类似的结果。关于我可以尝试什么的任何想法？谢谢！

Answer 1

使用以下代码将地图编组到 JSON 数组：

func writeJSON(w http.ResponseWriter, rep similarity.Similarity, keys []string) {
    var result []interface{}
    for _, sub := range rep.Submissions {
        var jsonMap = make(map[string]interface{})
        vals := makeRow(sub)
        for i := range vals {
            jsonMap[keys[i]] = vals[i]
        }
        result = append(result, jsonMap)
    }
    json.NewEncoder(w).Encode(result)
}

此代码不会产生您预期的结果，但它可能是您想要的。预期结果无效 JSON.

Answer 2

您要的格式无效，不是

{ {}, {}, }

应该是：

[ {}, {}, ]

从 Go 中的地图创建具有多个嵌套对象的单个 json 对象

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