Split request into controller and repo.

Also try returning better error message on exceptions and check for
errors in payload to return well-defined errors.

api/controllers/requestController.js

@@ -0,0 +1,64 @@
+const path = require("path");
+const RequestRepository = require(path.join(
+  __dirname, "../request"
+));
+
+function addRequest(req, res) {
+  const { wine } = req.body;
+
+  return RequestRepository.addNew(wine)
+    .then(wine => res.json({
+      message: "Successfully added new request",
+      wine: wine,
+      success: true
+    }))
+    .catch(error => {
+      const { message, statusCode } = error;
+
+      return res.status(statusCode || 500).send({
+        success: false,
+        message: message || "Unable to add requested wine."
+      })
+    })
+}
+
+function getAllRequests(req, res) {
+  return RequestRepository.getAll()
+    .then(wines => res.json({
+      wines: wines,
+      success: true
+    }))
+    .catch(error => {
+      console.log("error in getAllRequests:", error);
+
+      const message = "Unable to fetch all requested wines."
+      return res.status(500).json({
+        success: false,
+        message: message
+      })
+    })
+}
+
+function deleteRequest(req, res) {
+  const { id } = req.params;
+
+  return RequestRepository.deleteById(id)
+    .then(_ => res.json({
+      message: `Slettet vin med id: ${ id }`,
+      success: true
+    }))
+    .catch(error => {
+      const { statusCode, message } = error;
+
+      return res.status(statusCode || 500).send({
+        success: false,
+        message: message || "Unable to delete requested wine."
+      });
+    })
+}
+
+module.exports = {
+  addRequest,
+  getAllRequests,
+  deleteRequest
+}