Add endpoint to list restaurant by ID

Added a new method `listRestaurantById` in the handler, which retrieves a restaurant by its ID. Included the corresponding route in `routes.go` and implemented the `ListRestaurantById` method in the service layer. Updated the restaurant interface to include this new method.

pkg/abstract/restaurant/restaurant.go

@@ -8,5 +8,6 @@ import (
 type Restaurant interface {
 	Add(ctx context.Context, user *restaurant.Restaurant) (bool, error)
 	ListRestaurants(ctx context.Context) ([]restaurant.Restaurant, error)
+	ListRestaurantById(ctx context.Context, restaurantId int64) (restaurant.Restaurant, error)
 	DeleteRestaurant(ctx context.Context, restaurantId int64) (bool, error)
 }

pkg/handler/restaurant/restaurant.go

@@ -63,6 +63,20 @@ func (s *RestaurantHandler) listRestaurants(c *gin.Context) {
 	c.JSON(http.StatusOK, results)
 }
 
+func (s *RestaurantHandler) listRestaurantById(c *gin.Context) {
+	ctx, cancel := context.WithTimeout(c.Request.Context(), 5*time.Second)
+	defer cancel()
+	restaurantId := c.Param("id")
+	restaurantID, _ := strconv.ParseInt(restaurantId, 10, 64)
+
+	result, err := s.service.ListRestaurantById(ctx, restaurantID)
+	if err != nil {
+		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, result)
+}
+
 func (s *RestaurantHandler) deleteRestaurant(c *gin.Context) {
 	ctx, cancel := context.WithTimeout(c.Request.Context(), 5*time.Second)
 	defer cancel()

pkg/handler/restaurant/routes.go

@@ -12,6 +12,7 @@ func (s *RestaurantHandler) registerGroup() *gin.RouterGroup {
 func (s *RestaurantHandler) routes() http.Handler {
 	s.router.POST("/", s.addRestaurant)
 	s.router.GET("/", s.listRestaurants)
+	s.router.GET("/:id", s.listRestaurantById)
 	s.router.DELETE("/:id", s.deleteRestaurant)
 	s.router.POST("/menu", s.addMenu)
 	s.router.GET("/menu", s.listMenus)

pkg/service/restaurant/list_restaurant_by_id.go

@@ -0,0 +1,16 @@
+package restaurant
+
+import (
+	"Go_Food_Delivery/pkg/database/models/restaurant"
+	"context"
+)
+
+func (restSrv *RestaurantService) ListRestaurantById(ctx context.Context, restaurantId int64) (restaurant.Restaurant, error) {
+	var restro restaurant.Restaurant
+
+	err := restSrv.db.Select(ctx, &restro, "restaurant_id", restaurantId)
+	if err != nil {
+		return restaurant.Restaurant{}, err
+	}
+	return restro, nil
+}