Added user permissions, delete user

src/backend/models/user.js

@@ -3,8 +3,9 @@
 
 'use strict';
 
-const db    = require('../db');
-const Model = require('objection').Model;
+const db             = require('../db');
+const Model          = require('objection').Model;
+const UserPermission = require('./user_permission');
 
 Model.knex(db);
 
@@ -30,6 +31,22 @@ class User extends Model {
         return ['roles'];
     }
 
+    static get relationMappings () {
+        return {
+            permissions: {
+                relation:   Model.HasOneRelation,
+                modelClass: UserPermission,
+                join:       {
+                    from: 'user.id',
+                    to:   'user_permission.user_id'
+                },
+                modify:     function (qb) {
+                    qb.omit(['id', 'created_on', 'modified_on', 'user_id']);
+                }
+            }
+        };
+    }
+
 }
 
 module.exports = User;

src/backend/models/user_permission.js

@@ -0,0 +1,30 @@
+// Objection Docs:
+// http://vincit.github.io/objection.js/
+
+'use strict';
+
+const db    = require('../db');
+const Model = require('objection').Model;
+
+Model.knex(db);
+
+class UserPermission extends Model {
+    $beforeInsert () {
+        this.created_on  = Model.raw('NOW()');
+        this.modified_on = Model.raw('NOW()');
+    }
+
+    $beforeUpdate () {
+        this.modified_on = Model.raw('NOW()');
+    }
+
+    static get name () {
+        return 'UserPermission';
+    }
+
+    static get tableName () {
+        return 'user_permission';
+    }
+}
+
+module.exports = UserPermission;