Answer for the Node-challage-master

README.md

@@ -56,3 +56,27 @@ The command above will run the following test suites sequentially:
 
 
 Happy hacking 😁!
+
+##First Task
+
+The first thing i did is downloading all the required modules and softwares needed for the challange. I used Node.js, Express.js,Jest.js,Supertest,body-parser,Posgres and dotenv files.
+
+##Second Task
+
+Then i created a database in my posgres called "challenge" and import dump.sql file to that database. And in my node application i created a local server and connect it to port 8080 and also connect my node application to database.
+##Third Task
+
+I used REST api to access the data in the database. So i use GET method to fetch the all the data. One thing i added here even though the challenge only ask to fetch the data, i used all the CRUD application so that the application allow to add,update,delete expenses from the database.Not only that i added a method that will allow to get a specific data using its ID. I used express,body-parser and dotenv in the application.
+
+##Forth Task
+
+After that i wrote a code that will filter expenses based on "amount_in_cents" and "status". I gave a specific query to select data that are greater than 6000 and status pending to test it. Also added a sorting function to sort by "amount_in_cents". Also a pagination function will put data in pages.
+
+##Final Task
+
+The final task is to test the application. I used a "Jest.js" and "supertest" for testing the project.
+
+##Additional
+
+Additional thing is that i also done the same application using Node.js and MongoDB. so request me if you are interested to see it.
+

__test__.js

@@ -0,0 +1,16 @@
+
+const server = require('./api');
+const supertest = require('supertest');
+const app = require('./server')
+describe('GET /expenses', function(){
+    it('respond with json', function(done){
+      request(app)
+        .get('/expenses')
+        .set('Accept', 'application/json')
+        .expect(200)
+        .end(function(err, res){
+          if (err) return done(err);
+          done()
+        });
+    })
+  });

api.js

@@ -0,0 +1,100 @@
+const clients = require('./connection');
+const app = require('./server')
+clients.connect();
+
+app.get('/expenses',(req,res)=>{
+    //============SORTING===========
+    var sort = (function(err){
+        if(err)
+            throw err;
+        con.query("SELECT * from expenses by amount_in_cents",function(err,result,fields){
+            if(err)throw err;
+            console.log(result)
+        })
+    })
+    //=============FILTERING===============
+    var filter = (function(db_error) {
+        if (db_error) throw db_error;
+        console.log("Connected!");
+        var sql = "select * from expenses where amount_in_cents >='6000' and status='pending'";
+        DB_Conn.query(sql, function (db_error, result) {
+          if (db_error) throw db_error;
+          console.log(result);
+        });
+
+      });
+      //============PAGINATION===================
+      var numRows;
+      var queryPagination;
+      var numPerPage = parseInt(req.query.npp, 10) || 1;
+      var page = parseInt(req.query.page, 10) || 0;
+      var numPages;
+      var skip = page * numPerPage;
+      // Here we compute the LIMIT parameter 
+      var limit = skip + ',' + numPerPage;
+      queryAsync('SELECT count(*) as numRows FROM expenses')
+      .then(function(results) {
+        numRows = results[0].numRows;
+        numPages = Math.ceil(numRows / numPerPage);
+        console.log('number of pages:', numPages);
+
+    clients.query((err,result)=>{
+        if(!err){
+            res.send(result.rows)
+        }
+    })
+    clients.end;
+})
+app.get('/expenses/:id',(req,res)=>{
+    clients.query(`Select * from users where id=${req.params.id}`)
+        if(!err){
+            res.send(result.rows);
+        }
+        clients.end;
+    })
+    app.post('/expenses',(req,res)=>{
+        const user = req.body;
+        let insertQuery = `Insert into expenses(id,merchant_name,amount_in_cents,currency,user_id,date_created,status)
+        values${expenses.id},${expenses.merchant_name},${expenses.amount_in_cents},${expenses.currency},${expenses.user_id},${expenses.date_created},${expenses.status}`
+    clients.query(insertQuery,(err,result)=>{
+        if(!err){
+            res.send(`Insertion is Sucessful!!!`)
+        }
+        else{
+            console.log(err.message)
+        }
+    })
+    clients.end;
+    })
+    app.put('/expenses/:id',(req,res)=>{
+        let user = req.body;
+        let UpdateQuery = `update expenses
+                            set merchant_name ='${expenses.merchant_name}',
+                            amount_in_cents='${amount_in_cents},
+                           currency = '${expenses.currency}',
+                            user_id = '${expenses.user_id}',
+                            date_created ='${expenses.date_created}',
+                            status = '${expenses.status}',
+                            where id = '${expences.id}'`
+        clients.query(UpdateQuery, (err,result)=>{
+            if(!err){
+                res.send('Update was sucessful!!!')
+            }else{
+                console.log(err.message)
+            }
+        })
+        clients.end;                            
+    })
+    app.delete('./expenses/:id',(req,res)=>{
+        let deleteQuery = `delete form expenses where id=${req.params.id}`
+        clients.query(deleteQuery, (err,result)=>{
+            if(!err){
+                res.send('Deletion was Sucessful!!!')
+            }else{
+                console.log(err.message)
+            }
+        })
+        clients.end;
+    })
+})
+module.exports = app;

connection.js

@@ -0,0 +1,9 @@
+const {Client} = require('pg')
+const client = new Client({
+    host:"localhost",
+    user: "postgres",
+    port: 5432,
+    password:"1234",
+    database: "challange"
+})
+module.exports = client;