datamodel done without validators

wagfarm-api/logs/harvest/model.go

@@ -0,0 +1,34 @@
+package harvest
+
+import (
+	"wagfarm-api/assets/product"
+	"wagfarm-api/database"
+	"wagfarm-api/logs/base"
+
+	"github.com/shopspring/decimal"
+	"gorm.io/gorm"
+)
+
+type HarvestLog struct {
+	base.FieldWorkLog
+	ProductID uint            `gorm:"not null"`
+	Product   product.Product `gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;not null"`
+	Amount    float64         `gorm:"not null"` // in units of the product
+}
+
+func (l *HarvestLog) AfterSave(db *gorm.DB) (err error) {
+	// Example: compute cost as Amount * UnitPrice
+	if l.ProductID == 0 {
+		if err := db.First(&l.Product, l.ProductID).Error; err != nil {
+			return err
+		}
+	}
+
+	unitPrice := l.Product.Cost
+	totalCost := unitPrice.Mul(decimal.NewFromFloat(l.Amount))
+	l.UpdateCost(db, totalCost)
+
+	return
+}
+
+func RegisterModels() { database.RegisterModel(&HarvestLog{}) }