Use array_agg to get the taxes for the product’s form

pkg/products.go

@@ -40,21 +40,10 @@ func GetProductForm(w http.ResponseWriter, r *http.Request, params httprouter.Pa
 		mustRenderNewProductForm(w, r, form)
 		return
 	}
-	var productId int
+	if notFoundErrorOrPanic(conn.QueryRow(r.Context(), "select product.name, product.description, to_price(price, decimal_digits), array_agg(tax_id) from product join product_tax using (product_id) join company using (company_id) join currency using (currency_code) where product.slug = $1 group by product_id, product.name, product.description, price, decimal_digits", slug).Scan(form.Name, form.Description, form.Price, form.Tax)) {
-	if notFoundErrorOrPanic(conn.QueryRow(r.Context(), "select product_id, product.name, product.description, to_price(price, decimal_digits) from product join company using (company_id) join currency using (currency_code) where product.slug = $1", slug).Scan(&productId, form.Name, form.Description, form.Price)) {
 		http.NotFound(w, r)
 		return
 	}
-	rows, err := conn.Query(r.Context(), "select tax_id from product_tax where product_id = $1", productId)
-	if err != nil {
-		panic(err)
-	}
-	defer rows.Close()
-	for rows.Next() {
-		if err := rows.Scan(form.Tax); err != nil {
-			panic(err)
-		}
-	}
 	w.WriteHeader(http.StatusOK)
 	mustRenderEditProductForm(w, r, form)
 }