Implementation method of coupon management function in food ordering system developed with Go language

Go language development method to implement the coupon management function in the food ordering system

With the rapid development of the Internet and mobile payment, the food ordering system has become an important part of the catering industry. Important tool. In order to attract more users and increase consumers' willingness to purchase, many catering companies use coupons as a common marketing tool. This article will introduce how to use Go language to develop a coupon management function and provide relevant code examples.

1. Database design

First, we need to design a database model to store coupon-related information. Common fields include coupon ID, coupon name, coupon type, discount or amount, usage conditions, validity period, etc. The following is an example of a simple coupon table structure:

type Coupon struct {
    ID           uint
    Name         string
    Type         string
    Amount       float64
    Condition    float64
    ValidFrom    time.Time
    ValidTo      time.Time
    IsUsed       bool
}

2. Coupon generation

Catering companies can generate coupons in different ways, such as full discounts, discounts Discounts etc. The following is an example of a function that generates random discount coupons:

func generateDiscountCoupon(discount float64) Coupon {
    coupon := Coupon{
        Name: "折扣优惠券",
        Type: "折扣",
        Amount: discount,
        ValidFrom: time.Now(),
        ValidTo: time.Now().AddDate(1, 0, 0), // 有效期为一年
        IsUsed: false,
    }
    return coupon
}

3. Coupon collection

Users can receive coupons in the ordering system. To simplify the example, we assume that the user has logged in, and when the user receives the coupon, the coupon is bound to the user. The following is a simple function example for receiving coupons:

func claimCoupon(userID uint, couponID uint) error {
    coupon, err := getCouponByID(couponID)
    if err != nil {
        return err
    }

    user, err := getUserByID(userID)
    if err != nil {
        return err
    }

    // 领取优惠券
    user.Coupons = append(user.Coupons, coupon)

    // 更新用户信息
    err = updateUser(user)
    if err != nil {
        return err
    }

    return nil
}

4. Coupon usage

Users can choose to use coupons when ordering, and the system needs to verify the coupons Whether the validity and usage conditions are met. The following is a simple function example using coupons:

func useCoupon(userID uint, couponID uint, orderAmount float64) (float64, error) {
    coupon, err := getCouponByID(couponID)
    if err != nil {
        return 0.0, err
    }

    // 验证优惠券是否可用
    if !coupon.IsUsed && time.Now().After(coupon.ValidFrom) && time.Now().Before(coupon.ValidTo) {
        // 验证使用条件
        if orderAmount >= coupon.Condition {
            // 计算折扣金额
            discountAmount := orderAmount * (1 - coupon.Amount)
            return discountAmount, nil
       }
    }

    return 0.0, errors.New("优惠券不可用")
}

Through the above code example, we can see that it is not complicated to implement the coupon management function using Go language. Of course, more business logic and security issues need to be considered in actual development. I hope this article can provide readers with some reference and help in developing the coupon management function in the ordering system.

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