add(backend) Сделано API под корзину

backend/database/db.go

@@ -20,5 +20,5 @@ func InitDB() {
 		log.Fatal("Failed to connect to database:", err)
 	}
 
-	DB.AutoMigrate(&models.Item{}, &models.User{})
+	DB.AutoMigrate(&models.Item{}, &models.User{}, &models.CartItem{})
 }

backend/handlers/cart_handler.go

@@ -0,0 +1,108 @@
+package handlers
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"fishfish/database"
+	"fishfish/models"
+)
+
+func getUserID(c *gin.Context) uint {
+	userID, _ := c.Get("user_id")
+	return userID.(uint)
+}
+
+func GetCart(c *gin.Context) {
+	userID := getUserID(c)
+
+	var cartItems []models.CartItem
+	if err := database.DB.Preload("Item").Where("user_id=?", userID).Find(&cartItems).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Не удалось получить корзину"})
+		return
+	}
+
+	c.JSON(http.StatusOK, cartItems)
+}
+
+func AddToCart(c *gin.Context) {
+	userID := getUserID(c)
+
+	var req struct {
+		ItemID   uint    `json:"item_id" bindind:"required"`
+		Quantity float64 `json:"quantity" bindind:"required,gt=0"`
+	}
+
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Некорректные данные"})
+		return
+	}
+
+	var item models.Item
+
+	if err := database.DB.First(&item, req.ItemID).Error; err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Товар не найден"})
+		return
+	}
+
+	if req.Quantity > item.Stock {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Недостаточно товара на складе"})
+	}
+
+	var cartItem models.CartItem
+	err := database.DB.Where("user_id = ? AND item_id = ?", userID, req.ItemID).First(&cartItem).Error
+	if err != nil {
+
+		cartItem = models.CartItem{
+			UserID:   userID,
+			ItemID:   req.ItemID,
+			Quantity: req.Quantity,
+		}
+
+		database.DB.Create(&cartItem)
+	} else {
+		cartItem.Quantity += req.Quantity
+		database.DB.Save(&cartItem)
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "Товар добавлен в корзину"})
+}
+
+func UpdateCartItem(c *gin.Context) {
+	userID := getUserID(c)
+	cartItemID := c.Param("id")
+
+	var req struct {
+		Quantity float64 `json:"quantity" binding:"required,gt=0"`
+	}
+
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Некорректные данные"})
+		return
+	}
+
+	var cartItem models.CartItem
+	if err := database.DB.Where("id = ? AND user_id = ?", cartItemID, userID).First(&cartItem).Error; err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Позиция не найдена"})
+		return
+	}
+
+	cartItem.Quantity = req.Quantity
+	database.DB.Save(&cartItem)
+
+	c.JSON(http.StatusOK, gin.H{"message": "Количество обновлено"})
+}
+
+func RemoveFromCart(c *gin.Context) {
+	userID := getUserID(c)
+	cartItemID := c.Param("id")
+
+	result := database.DB.Where("id = ? AND user_id = ? ", cartItemID, userID).Delete(&models.CartItem{})
+	if result.RowsAffected == 0 {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Позиция не найдена"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "Товар удален из корзины"})
+}

backend/main.go

@@ -48,6 +48,10 @@ func main() {
 			protected.DELETE("/items/:id", handlers.DeleteItem)
 			protected.PATCH("/items/:id", handlers.UpdateItem)
 			protected.POST("/items", handlers.AddItem)
+			protected.GET("/cart/", handlers.GetCart)
+			protected.POST("/cart/", handlers.AddToCart)
+			protected.PATCH("/cart/:id", handlers.UpdateCartItem)
+			protected.DELETE("/cart/:id", handlers.RemoveFromCart)
 		}
 
 		admin := protected.Group("/")

backend/models/cart.go

@@ -0,0 +1,16 @@
+package models
+
+import (
+	"time"
+)
+
+type CartItem struct {
+	ID        uint      `json:"id" gorm:"primaryKey"`
+	UserID    uint      `json:"user_id" gorm:"not null;uniqueIndex;idx_user_item"`
+	ItemID    uint      `json:"item_id" gorm:"not null;uniqueIndex;idx_user_item"`
+	Quantity  float64   `json:"quantity" gorm:"not null;default:1"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+
+	Item Item `json:"item" gorm:"foreignKey:ItemID"`
+}

backend/models/user.go

@@ -6,7 +6,7 @@ type User struct {
 	gorm.Model `json:"-"`
 	Username   string `gorm:"unique;not null" binding:"required"`
 	Password   string `gorm:"not null" json:"-" binding:"required,min=8"`
-	Role       string `gorm:"default:'Рабочий'" json:"role"`
+	Role       string `gorm:"default:'customer'" json:"role"`
 	FirstName  string `json:"first_name" binding:"required"`
 	LastName   string `gorm:"index" json:"last_name" binding:"required"`
 	Phone      string `gorm:"index" json:"phone"`