Go language development of door-to-door cooking system: How to implement user subscription function?

Go language development of door-to-door cooking system: How to implement user subscription function?

Introduction:
As people's demand for healthy eating increases, more and more people are choosing to enjoy high-quality food at home. Door-to-door cooking services emerged as the times require, providing users with a convenient, healthy and delicious dining experience. In the process of developing a door-to-door cooking system, the user subscription function is an important requirement. This article will use the Go language as an example to introduce how to implement the user subscription function and provide specific code examples.

1. Requirements Analysis
Before implementing the user subscription function, we need to clarify the requirements first. The user subscription function mainly includes the following aspects:

1. User registration and login: Users need to register and log in to use the subscription function.
2. Subscription packages: Users can choose to subscribe to different packages, each package contains different dishes.
3. Order management: Users can view the subscribed packages, modify the subscription content or cancel the subscription.
4. Payment processing: Users need to complete the payment operation before they can successfully subscribe to dishes.
5. Push notification: The system needs to send notifications such as successful subscription, modification of subscription, and cancellation of subscription to the user.

2. Database design
Before implementing the user subscription function, we need to design the corresponding database structure to store information such as users, packages, orders, etc. The following is a simple database design example:

1. Users table (users):

   • id: user ID
   • username: user Name
   • password: Password
   • email: Email

2. Packages:

   • id ：Package ID
   • name：Package name
   • price：Package price
   • description：Package description

3. Order form (orders):

   • id: order ID
   • user_id: user ID (foreign key)
   • package_id: package ID (foreign key)
   • subscribe_date: Subscription date
   • subscribe_status: Subscription status (0-unpaid, 1-paid)

3. Code implementation
Next , we will use Go language to implement the specific code of user subscription function. First, we need to use Go's web framework (such as Gin) to build a server-side application.

1. User registration and login:
   User registration and login functions can use JWT (Json Web Token) to implement user authentication and permission management. The following is a simple code example:

// 注册
func Signup(c *gin.Context) {
    // 获取注册表单参数
    var user User
    if err := c.ShouldBindJSON(&user); err != nil {
        // 处理参数错误
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    // 存储用户信息到数据库
    err := db.Create(&user).Error
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"message": "注册成功"})
}

// 登录
func Login(c *gin.Context) {
    // 获取登录表单参数
    var userReq UserReq
    if err := c.ShouldBindJSON(&userReq); err != nil {
        // 处理参数错误
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    // 验证用户信息是否正确
    var user User
    err := db.Where("username = ? AND password = ?", userReq.Username, userReq.Password).First(&user).Error
    if err != nil {
        c.JSON(http.StatusUnauthorized, gin.H{"error": "用户名或密码错误"})
        return
    }

    // 生成JWT并返回给客户端
    token, err := generateToken(user.ID)
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"token": token})
}

2. Package management:
   Packages can be added, deleted, modified and checked through the database. The following is a simple code example:

// 获取套餐列表
func GetPackages(c *gin.Context) {
    var packages []Package
    err := db.Find(&packages).Error
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"packages": packages})
}

// 添加套餐
func AddPackage(c *gin.Context) {
    var package Package
    if err := c.ShouldBindJSON(&package); err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    err := db.Create(&package).Error
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"message": "添加套餐成功"})
}

// 修改套餐
func UpdatePackage(c *gin.Context) {
    packageID := c.Param("id")
    var package Package
    if err := db.Where("id = ?", packageID).First(&package).Error; err != nil {
        c.JSON(http.StatusNotFound, gin.H{"error": "套餐不存在"})
        return
    }

    var newPackage Package
    if err := c.ShouldBindJSON(&newPackage); err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    package.Name = newPackage.Name
    package.Price = newPackage.Price
    package.Description = newPackage.Description

    err := db.Save(&package).Error
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"message": "修改套餐成功"})
}

// 删除套餐
func DeletePackage(c *gin.Context) {
    packageID := c.Param("id")
    var package Package
    if err := db.Where("id = ?", packageID).First(&package).Error; err != nil {
        c.JSON(http.StatusNotFound, gin.H{"error": "套餐不存在"})
        return
    }

    err := db.Delete(&package).Error
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"message": "删除套餐成功"})
}

3. Order management:
   The order management function mainly includes operations such as subscribing to packages, viewing orders, and canceling orders. The following is a simple code example:

// 订阅套餐
func SubscribePackage(c *gin.Context) {
    userID := getUserIDFromToken(c)

    // 获取订阅表单参数
    var order OrderReq
    if err := c.ShouldBindJSON(&order); err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    // 验证套餐是否存在
    var package Package
    if err := db.Where("id = ?", order.PackageID).First(&package).Error; err != nil {
        c.JSON(http.StatusNotFound, gin.H{"error": "套餐不存在"})
        return
    }

    // 创建订单
    order := Order{
        UserID: userID,
        PackageID: order.PackageID,
        SubscribeDate: time.Now(),
        SubscribeStatus: 0,  // 未支付状态
    }
    err := db.Create(&order).Error
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"message": "订阅成功"})
}

// 查看订单
func GetOrders(c *gin.Context) {
    userID := getUserIDFromToken(c)

    var orders []Order
    err := db.Where("user_id = ?", userID).Find(&orders).Error
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"orders": orders})
}

// 取消订单
func CancelOrder(c *gin.Context) {
    userID := getUserIDFromToken(c)
    orderID := c.Param("id")

    var order Order
    if err := db.Where("id = ? AND user_id = ?", orderID, userID).First(&order).Error; err != nil {
        c.JSON(http.StatusNotFound, gin.H{"error": "订单不存在"})
        return
    }

    err := db.Delete(&order).Error
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"message": "取消订单成功"})
}

The above code is just a simple example. In actual projects, related error handling, logging, etc. also need to be considered. The specific code implementation can be expanded and adjusted according to actual needs.

Summary:
The user subscription function is a very important part of the door-to-door cooking system. This article takes the Go language as an example to introduce how to use the Go language to develop the user subscription function and provides specific code examples. . Through the above code examples, we can better understand how to design and implement user subscription functions, and apply them more efficiently in actual project development. At the same time, we also need to carry out corresponding expansion and optimization based on specific business needs.

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