结构对象数组在响应中没有得到返回[重复]

Question

我的模型有以下数据：

package main

type Subject struct {
    name    string `json:name`
    section int     `json:section`
}

var subjects = map[string][]Subject{
    "1001": []Subject{
        {
            name:    "Phy",
            section: 1,
        },
        {
            name:    "Phy",
            section: 2,
        },
    },
    "1002": []Subject{
        {
            name:    "Chem",
            section: 1,
        },
        {
            name:    "Chem",
            section: 2,
        },
    },
    "1003": []Subject{
        {
            name:    "Math",
            section: 1,
        },
        {
            name:    "Math",
            section: 2,
        },
    },
    "1004": []Subject{
        {
            name:    "Bio",
            section: 1,
        },
        {
            name:    "Bio",
            section: 2,
        },
    },
}

我正在创建如下路线：

route.GET("/subjects/:id", func(c *gin.Context) {
    
        id := c.Param("id")
        subjects := subjects[id]

        c.JSON(http.StatusOK, gin.H{
            "StudentID": id,
            "Subject":  subjects,
        })
    })

它试图使用邮递员调用它：localhost:8080/subjects/1001 但它只显示 {} {} 而不是主题结构的对象数组。

输出： { "学生证": "1001", “主题”： [ {}， {} ] }

Answer 1

这是因为您的Subject 使用小写字段name 和section，因此不会被序列化。

改成：

type Subject struct {
    Name    string `json:"name"`
    Section int    `json:"section"`
}

将显示字段：

{
  "StudentID": "1001",
  "Subject": [
    {"name":"Phy","section":1},
    {"name":"Phy","section":2}
  ]
}