Feature/migrate to graphql

package.json

@@ -13,6 +13,8 @@
     "cookie-parser": "~1.4.4",
     "debug": "~2.6.9",
     "express": "~4.16.1",
+    "express-graphql": "^0.8.0",
+    "graphql": "^14.3.1",
     "http-errors": "~1.6.3",
     "morgan": "~1.9.1",
     "nodemon": "^1.19.1"

src/app.js

@@ -3,7 +3,7 @@ const express = require('express');
 const logger = require('morgan');
 
 const indexController = require('./controller/indexController');
-const employeesController = require('./controller/employeesController');
+const graphqlController = require('./controller/graphqlController');
 
 const app = express();
 
@@ -12,7 +12,7 @@ app.use(express.json());
 app.use(express.urlencoded({ extended: false }));
 
 app.use('/', indexController);
-app.use('/api/employees', employeesController);
+app.use('/graphql', graphqlController);
 
 // catch 404 and forward to error handler
 app.use((req, res, next) => {

src/controller/graphqlController.js

@@ -0,0 +1,43 @@
+
+const graphqlHTTP = require('express-graphql');
+const { buildSchema } = require('graphql');
+const employeesService = require('../service/employeeService');
+
+// Construct a schema, using GraphQL schema language
+const schema = buildSchema(`
+  type Query {
+    employee(id: Int!): Employee
+    employees: [Employee],
+  }
+  type Mutation {
+      createEmployee(name: String!, department: String!): Employee,
+      deleteEmployee(id: Int!): DeleteEmployeeResponse
+  }
+  input EmployeeInput {
+      name: String!,
+      department: String!
+  }
+  type DeleteEmployeeResponse {
+    id: Int!
+  }
+  type Employee {
+    id: Int!,
+    name: String!,
+    department: String!
+  }
+`);
+
+const root = {
+  employee: graphqlInput => employeesService.getById(graphqlInput && graphqlInput.id),
+  employees: employeesService.getAll(),
+  createEmployee: graphqlInput => employeesService.save(graphqlInput),
+  deleteEmployee: graphqlInput => employeesService.deleteById(graphqlInput.id),
+};
+
+const graphql = graphqlHTTP({
+  schema,
+  rootValue: root,
+  graphiql: true,
+});
+
+module.exports = graphql;

src/controller/indexController.js

@@ -3,6 +3,6 @@ const express = require('express');
 const router = express.Router();
 
 /* GET home page. */
-router.get('/', (req, res) => res.json({ app: 'awesome company' }));
+router.get('/', (req, res) => res.redirect('/graphql'));
 
 module.exports = router;