implements a category route

models/CategoryModel.js

@@ -0,0 +1,50 @@
+const db = require('../db/Pool');
+const pgp = require('pg-promise')({ capSQL: true });
+
+module.exports = class CategoryModel {
+    async getAll() {
+        try {
+            const statement = "SELECT * FROM category";
+            const result = await db.query(statement);
+            if (result.rows.length) return result.rows;
+            return null;
+        } catch(e) {
+            throw new Error(e);
+        }
+    }
+
+    async getById(id) {
+        try {
+            const statement = "SELECT * FROM category WHERE id = $1";
+            const values = [id];
+            const result = await db.query(statement, values);
+            if (result.rows.length) return result.rows;
+            return null;
+        } catch(e) {
+            throw new Error(e);
+        }
+    }
+
+    async getByName(name) {
+        try {
+            const statement = "SELECT * FROM category WHERE name = $1";
+            const values = [name];
+            const result = await db.query(statement, values);
+            if (result.rows.length) return result.rows;
+            return null;
+        } catch(e) {
+            throw new Error(e);
+        }
+    }
+
+    async insertOne(data) {
+        try {
+            const statement = pgp.helpers.insert(data, null, 'category') + "RETURNING *";
+            const result = await db.query(statement);
+            if (result.rows.length) return result.rows;
+            return null;
+        } catch(e) {
+            throw new Error(e);
+        }
+    }
+}

routes/API.js

@@ -1,6 +1,7 @@
 const authRouter = require('./auth');
 const userRouter = require('./user');
 const productRouter = require('./product');
+const categoryRouter = require('./category');
 const regionsRouter = require('./regions');
 const orderRouter = require('./orders');
 const cartRouter = require('./cart');
@@ -9,6 +10,7 @@ module.exports = (app, passport) => {
     authRouter(app, passport);
     userRouter(app);
     productRouter(app);
+    categoryRouter(app);
     regionsRouter(app);
     orderRouter(app);
     cartRouter(app);

routes/category.js

@@ -0,0 +1,49 @@
+const router = require('express').Router();
+const CategoryService = require('../services/CategoryService');
+const CategoryInstance = new CategoryService();
+
+module.exports = (app) => {
+    app.use('/api/category', router);
+
+    router.get('/', async (req, res, next) => {
+        const { name } = req.query;
+
+        if (name) {
+            try {
+                const response = await CategoryInstance.getByName(name);
+                res.status(200).send(response);
+            } catch(e) {
+                next(e);
+            }
+        } else {
+            try {
+                const response = await CategoryInstance.getAll();
+                res.status(200).send(response);
+            } catch(e) {
+                next(e);
+            }
+        }
+    })
+
+    router.get('/:productid', async (req, res, next) => {
+        const { productid } = req.params;
+
+        try {
+            const response = await CategoryInstance.getById(productid);
+            res.status(200).send(response);
+        } catch(e) {
+            next(e);
+        }
+    })
+
+    router.post('/', async (req, res, next) => {
+        const data = req.body;
+
+        try {
+            const response = await CategoryInstance.create(data);
+            res.status(201).send(response);
+        } catch(e) {
+            next(e);
+        }
+    })
+}

services/CategoryService.js

@@ -0,0 +1,29 @@
+const createError = require('http-errors');
+const CategoryModel = require('../models/CategoryModel');
+const CategoryInstance = new CategoryModel();
+
+module.exports = class CategoryService {
+    async getAll() {
+        const result = await CategoryInstance.getAll();
+        if (!result) throw createError(404, "Resource not found.");
+        return result;
+    }
+
+    async getById(id) {
+        const result = await CategoryInstance.getById(id);
+        if (!result) throw createError(404, "Resource not found.");
+        return result;
+    }
+    
+    async getByName(name) {
+        const result = await CategoryInstance.getByName(name);
+        if (!result) throw createError(404, "Resource not found.");
+        return result;
+    }
+
+    async create(data) {
+        const result = await CategoryInstance.insertOne(data);
+        if (!result) throw createError(404, "Resource not found.");
+        return result;
+    }
+}