diff --git a/src/models/users.js b/src/models/users.js
index be2f4f4..a78add1 100644
--- a/src/models/users.js
+++ b/src/models/users.js
@@ -1,5 +1,7 @@
 import mongoose from 'mongoose'
 import bcrypt from 'bcrypt'
+import config from '../../config'
+import jwt from 'jsonwebtoken'
 
 const User = new mongoose.Schema({
   type: { type: String, default: 'User' },
@@ -47,4 +49,10 @@ User.methods.validatePassword = function validatePassword(password) {
   })
 }
 
+User.methods.generateToken = function generateToken() {
+  const user = this
+
+  return jwt.sign({ id: user.id }, config.token)
+}
+
 export default mongoose.model('user', User)
diff --git a/src/modules/users/controller.js b/src/modules/users/controller.js
index 86712a0..d0ed964 100644
--- a/src/modules/users/controller.js
+++ b/src/modules/users/controller.js
@@ -1,12 +1,10 @@
 import User from '../../models/users'
-import config from '../../../config'
-import jwt from 'jsonwebtoken'
 
 export async function createUser(ctx) {
   const user = new User(ctx.request.body.user)
   try {
     await user.save()
-    const token = jwt.sign({ id: user.id }, config.token)
+    const token = user.generateToken()
 
     const response = user.toJSON()