product variant id

controllers/productVariantLinkController.go

@@ -0,0 +1,96 @@
+package controllers
+
+import (
+	"errors"
+	"strconv"
+
+	"nearle/models"
+	"nearle/repositories"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+/*
+Attaching sizes to a product, and taking them off again.
+
+The pair that was missing. `createproductvariant` wrote a name into a table
+without a parent, so there was no way to say "500ml is a size of Coke" — and
+without that the ordering screen had nothing but `products.variants` to work
+from, a bare group number that is 0 on every product.
+*/
+
+// AddProductVariant — POST /products/addproductvariant
+//
+// Body: {tenantid, productid, variantproductid, variantname, varianttype?, price?}
+func (ctl *ProductController) AddProductVariant(c *fiber.Ctx) error {
+	var body models.Productvariant
+	if err := c.BodyParser(&body); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"code": fiber.StatusBadRequest, "status": false,
+			"message": "could not read the request body",
+		})
+	}
+
+	if body.Tenantid <= 0 {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"code": fiber.StatusBadRequest, "status": false,
+			"message": "tenantid is required",
+		})
+	}
+
+	saved, err := ctl.productService.AddProductVariant(body)
+	if err != nil {
+		// The refusals are all about the CALLER's request, so they answer 400
+		// with the reason. Anything else is ours and answers 500.
+		for _, known := range []error{
+			repositories.ErrVariantParentMissing,
+			repositories.ErrVariantProductMissing,
+			repositories.ErrVariantSelfReference,
+			repositories.ErrVariantNotYours,
+			repositories.ErrVariantDuplicate,
+		} {
+			if errors.Is(err, known) {
+				return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+					"code": fiber.StatusBadRequest, "status": false,
+					"message": err.Error(),
+				})
+			}
+		}
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"code": fiber.StatusInternalServerError, "status": false,
+			"message": "could not add the variant",
+		})
+	}
+
+	return c.Status(fiber.StatusCreated).JSON(fiber.Map{
+		"code": fiber.StatusCreated, "status": true,
+		"message": "Success", "details": saved,
+	})
+}
+
+// RemoveProductVariant — DELETE /products/removeproductvariant?tenantid=&variantid=
+//
+// Detaches the size. Neither product is deleted: a variant is a relationship,
+// and removing it leaves two ordinary products behind.
+func (ctl *ProductController) RemoveProductVariant(c *fiber.Ctx) error {
+	tenantid, _ := strconv.Atoi(c.Query("tenantid"))
+	variantid, _ := strconv.Atoi(c.Query("variantid"))
+
+	if tenantid <= 0 || variantid <= 0 {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"code": fiber.StatusBadRequest, "status": false,
+			"message": "tenantid and variantid are both required",
+		})
+	}
+
+	if err := ctl.productService.RemoveProductVariant(tenantid, variantid); err != nil {
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"code": fiber.StatusInternalServerError, "status": false,
+			"message": "could not remove the variant",
+		})
+	}
+
+	return c.JSON(fiber.Map{
+		"code": fiber.StatusOK, "status": true, "message": "Success",
+	})
+}