fix error in user model

src/libs/db/mongoose.js

@@ -13,7 +13,7 @@ module.exports = () => {
     log.debug(`Connecting to MongDB on URI ${mongoUri}`);
     const db = mongoose.connect(mongoUri);
 
-    mongoose.connection.once('open', () => { log.info("MongoDB connected"); });
+    mongoose.connection.once('open', () => { log.info('MongoDB connected'); });
 
     return db;
 };

src/libs/models/user.js

-var mongoose = require('mongoose');
-var Schema = mongoose.Schema;
-var bcrypt = require('bcrypt');
+const mongoose = require('mongoose');
+const bcrypt = require('bcrypt');
 
+const Schema = mongoose.Schema;
+
+// set up a mongoose model
 var UserSchema = new Schema({
-  email:{
-    type: String,
-    required: true,
-    unique: true
-  },
+  email: {
+        type: String,
+        unique: true,
+        required: true
+    },
   password: {
-    type: String,
-    required: true
-  }
+        type: String,
+        required: true
+    }
 });
 
-UserSchema.pre('save', function(next){
-  var user = this;
-  if(this.isModified('password') || this.isNew){
-    bcrypt.genSalt(128, function (err, salt){
-      if(err){
-        return next(err);
-      }
-      bcrypt.hash(user.password, salt, function(err, hash){
-        if(err){
-          return next(err);
-        }
-        user.password = hash;
-        next();
-      });
-    });
-  }
-  else{
-    return next();
-  }
+UserSchema.pre('save', function (next) {
+    var user = this;
+    if (this.isModified('password') || this.isNew) {
+        bcrypt.genSalt(128, function (err, salt) {
+            if (err) {
+                return next(err);
+            }
+            bcrypt.hash(user.password, salt, function (err, hash) {
+                if (err) {
+                    return next(err);
+                }
+                user.password = hash;
+                next();
+            });
+        });
+    } else {
+        return next();
+    }
 });
 
-UserSchema.methods.comparePassword = function(passw, cb){
-  bcrypt.compare(passw, this.password, function(err, isMatch){
-    if(err){
-      return cb(err);
-    }
-    cb(null, isMatch)
-  });
+UserSchema.methods.comparePassword = function (passw, cb) {
+    bcrypt.compare(passw, this.password, function (err, isMatch) {
+        if (err) {
+            return cb(err);
+        }
+        cb(null, isMatch);
+    });
 };
 
 module.exports = mongoose.model('User', UserSchema);