restructured viewmodels, better serialization

controllers/issue.go

@@ -0,0 +1,33 @@
+package controllers
+
+import (
+	"github.com/Theodor-Springmann-Stiftung/kgpz_web/app"
+	"github.com/Theodor-Springmann-Stiftung/kgpz_web/helpers/logging"
+	"github.com/Theodor-Springmann-Stiftung/kgpz_web/viewmodels"
+	"github.com/gofiber/fiber/v2"
+)
+
+func GetIssue(kgpz *app.KGPZ) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		y := c.Params("year")
+		if len(y) != 4 {
+			logging.Error(nil, "Year is not 4 characters long")
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+
+		d := c.Params("issue")
+		if d == "" {
+			logging.Error(nil, "Issue number is empty")
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+
+		issue, err := viewmodels.IssueView(y, d, kgpz.Library)
+
+		if err != nil {
+			logging.Error(err, "Issue could not be found")
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+
+		return c.Render("/issue/", fiber.Map{"model": issue})
+	}
+}