Created get all topics endpoint and fixed topics POST

api/articles.js

@@ -11,6 +11,7 @@ then move it to the topics endpoints file.
 // Importing the articles model
 var Articles = require('../models/article.js');
 
+var db = require('../db.js'); //this file contains the knex file import. it's equal to knex=require('knex')
 
 module.exports =  function(app){
 

api/topics.js

@@ -8,6 +8,8 @@ comment in the articles.js (same directory).
 // Importing the topics model
 var Topics = require('../models/topic.js');
 
+var db = require('../db.js'); //this file contains the knex file import. it's equal to knex=require('knex')
+
 module.exports = function(app) {
 
 
@@ -22,6 +24,23 @@ module.exports = function(app) {
   });
 
 
+  app.get('/api/topics',function(req,res){
+    /*
+    This is a GET endpoint that responds with the list of all the topics in the topics table
+    the topics are present in the data object in the returning object.
+    the error key in the returning object is a boolen which is false if there is no error and true otherwise
+    */
+    Topics.forge()
+    .fetchAll()
+      .then(function (collection) {
+        res.json({error: false, data: collection.toJSON()});
+      })
+      .catch(function (err) {
+        res.status(500).json({error: true, data: {message: err.message}});
+      });
+  });
+
+
   app.get('/api/topic/:id/articles',function(req,res){
     /*
     This is a GET endpoint that responds with the list of all the articles that belong to a particular topic (topic of given id param)