us-coach-spider/product/option.go

package product

import (
	productv1 "gitea.timerzz.com/kedaya_haitao/common/model/product"
	"gorm.io/gorm"
	"time"
)

type Option struct {
	ID           uint          `gorm:"primary_key" json:"id"`
	Interval     time.Duration `yaml:"interval" json:"interval"`
	ExchangeRate float64       `yaml:"exchangeRate" json:"exchangeRate"` //汇率
	Freight      float64       `yaml:"freight" json:"freight"`           //运费
	Discount     int           `yaml:"discount" json:"discount"`         //折扣
}

func (c *Controller) LoadOption() {
	c.db.Where("id = ?", 1).Attrs(Option{Interval: time.Hour * 12, ExchangeRate: 7.3, Freight: 100, Discount: 100}).FirstOrCreate(&c.Option)
}

func (c *Controller) SaveOption(opt Option) {
	if opt.Interval > 0 {
		c.Option.Interval = opt.Interval
	}
	var change bool
	var oldFreight float64
	if opt.ExchangeRate > 0 && opt.ExchangeRate != c.Option.ExchangeRate {
		c.Option.ExchangeRate = opt.ExchangeRate
		change = true
	}
	if opt.Freight > 0 && opt.Freight != c.Option.Freight {
		c.Option.Freight, oldFreight = opt.Freight, c.Option.Freight
		change = true
	}
	if opt.Discount > 0 && opt.Discount != c.Option.Discount {
		c.Option.Discount = opt.Discount
		change = true
	}
	opt.ID = 1
	c.db.Updates(opt)
	if change {
		c.updateRate(oldFreight)
	}
}

func (c *Controller) updateRate(oldFreight float64) {
	var results []*productv1.Product
	c.db.FindInBatches(&results, 20, func(tx *gorm.DB, batch int) error {
		for _, result := range results {
			if result.Freight == oldFreight {
				result.Freight = c.Option.Freight
			}
			result.ExchangeRate = c.Option.ExchangeRate
			result.Discount = c.Option.Discount
		}

		// 保存对当前批记录的修改
		tx.Save(&results)
		return nil
	})
}

func (c *Controller) GetOption() Option {
	return c.Option
}