added backend implementation

backend/controller/issueVariants.js

@@ -0,0 +1,103 @@
+//import functions from issue variants model
+import {
+    getAllIssueVariants,
+    getIssueVariantById,
+    getSelectedIssueVariantsByIssueId,
+    getSelectedIssueVariantsByName,
+    updateIssueVariantById,
+    deleteIssueVariantById,
+    deleteIssueVariantByIssueSlipId,
+    insertIssueVariant,
+} from "../models/issuesModel.js";
+
+//get all issue variants
+export const showIssueVariants = (req, res) => {
+    getAllIssueVariants((err, results) => {
+        if (err) {
+            res.send(err);
+        } else {
+            res.json(results);
+        }
+    });
+};
+
+// Delete issue variant
+export const deleteIssueVariant = (req, res) => {
+    const id = req.params.id;
+    deleteIssueVariantById(id, (err, results) => {
+        if (err) {
+            res.send(err);
+        } else {
+            res.json(results);
+        }
+    });
+};
+
+// Delete issue variant by issue slip id
+export const deleteIssueVariantByIssueSlipIds = (req, res) => {
+    const id = req.params.id;
+    deleteIssueVariantByIssueSlipId(id, (err, results) => {
+        if (err) {
+            res.send(err);
+        } else {
+            res.json(results);
+        }
+    });
+};
+
+//create new issue variant
+export const createIssueVariant = (req, res) => {
+    const data = req.body;
+    insertIssueVariant(data, (err, results) => {
+        if (err) {
+            res.send(err);
+        } else {
+            res.json(results);
+        }
+    });
+};
+
+//get single issue variant by id
+export const showIssueVariantById = (req, res) => {
+    getIssueVariantById(req.params.id, (err, results) => {
+        if (err) {
+            res.send(err);
+        } else {
+            res.json(results);
+        }
+    });
+};
+
+// Update issue variant
+export const updateIssueVariant = (req, res) => {
+    const data = req.body;
+    updateIssueVariantById(data, (err, results) => {
+        if (err) {
+            res.send(err);
+        } else {
+            res.json(results);
+        }
+    });
+};
+
+//get all selected issue variants by issueID
+export const showSelectedIssueVariantsByIssueId = (req, res) => {
+    getSelectedIssueVariantsByIssueId(req.params.id, (err, results) => {
+        if (err) {
+            res.send(err);
+        } else {
+            res.json(results);
+        }
+    });
+};
+
+//get all selected issue variants by name
+export const showSelectedIssueVariantsByName = (req, res) => {
+    getSelectedIssueVariantsByName(req.params.id, (err, results) => {
+        if (err) {
+            res.send(err);
+        } else {
+            res.json(results);
+        }
+    });
+};