Updated role model and created perm model in API

api/models/permission-model.js

@@ -0,0 +1,13 @@
+const bookshelf = require('../database/bookshelf').bookshelf
+
+require('./role-model')
+
+let Permission = bookshelf.Model.extend({
+    tableName: 'permission',
+    hidden: [ 'id' ],
+    role() {
+        return this.belongsToMany( 'Role', 'role_permission' )
+    }
+})
+
+module.exports = bookshelf.model( 'Permission', Permission );

api/models/role-model.js

@@ -1,7 +1,12 @@
 const bookshelf = require('../database/bookshelf').bookshelf
 
+require('./permission-model')
+
 let Role = bookshelf.Model.extend({
     tableName: 'role',
+    permissions() {
+        return this.belongsToMany( 'Permission', 'role_permission' );
+    }
 })
 
-module.exports = bookshelf.model('Role', Role);
+module.exports = bookshelf.model( 'Role', Role );