Fix flake8 and other problems

recircle/authorization/admin.py

-from django.contrib import admin
-
-# Register your models here.

recircle/authorization/mixins.py

@@ -27,7 +27,7 @@ class AuthorizationMixin():
 
     def has_perms_for_model(self, user, method, model):
         auth_params = self.authorization[method]
-        if auth_params: 
+        if auth_params:
             pass
         else:
             logger.error(f"Invalid method for authorization: {method}")

recircle/authorization/models.py

-from django.db import models
-
-# Create your models here.

recircle/authorization/test.txt

-from django.contrib.auth.models import User
-from instance.models import Instance
-from guardian.shortcuts import get_objects_for_user
-
-test_user = User.objects.get(username="test")
-
-get_objects_for_user(test_user, "use_instance", Instance)
-

recircle/authorization/tests.py

-from django.test import TestCase
-
-# Create your tests here.

recircle/authorization/views.py

-from django.shortcuts import render
-
-# Create your views here.

recircle/instance/views.py

@@ -51,8 +51,6 @@ class InstanceViewSet(AuthorizationMixin, ViewSet):
         # flavor = Flavor.objects.get(pk=data["flavor"])
         # lease = Lease.objects.get(pk=data["lease"])
 
-        
-
         newInstance = Instance.create_instance_from_template(
             params={"name": data["name"],
                     "description": data["description"],
@@ -79,14 +77,14 @@ class InstanceViewSet(AuthorizationMixin, ViewSet):
         return Response(merged_dict)
 
     # I think we need separate actions for this behaviour because of the access control - BAdam
-    
-    # def update(self, request, pk, format=None):
-    #     instance = self.get_object(pk)
-    #     serializer = InstanceSerializer(instance, data=request.data)
-    #     if serializer.is_valid():
-    #         serializer.save()
-    #         return Response(serializer.data)
-    #     return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
+
+    def update(self, request, pk, format=None):
+        instance = self.get_object(pk)
+        serializer = InstanceSerializer(instance, data=request.data)
+        if serializer.is_valid():
+            serializer.save()
+            return Response(serializer.data)
+        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
 
     def destroy(self, request, pk, format=None):
         instance = self.get_object(pk)