[bugfix] Override get_temp_model_instance to add org #27

Fixes #27
Closes #87
Closes #88

openwisp_controller/config/admin.py

@@ -20,6 +20,18 @@ class ConfigForm(AlwaysHasChangedMixin, AbstractConfigForm):
     class Meta(AbstractConfigForm.Meta):
         model = Config
 
+    def get_temp_model_instance(self, **options):
+        config_model = self.Meta.model
+        instance = self.Meta.model(**options)
+        device_model = config_model.device.field.related_model
+        org = Organization.objects.get(pk=self.data['organization'])
+        instance.device = device_model(
+            name=self.data['name'],
+            mac_address=self.data['mac_address'],
+            organization=org
+        )
+        return instance
+
 
 class ConfigInline(MultitenantAdminMixin, AbstractConfigInline):
     model = Config

openwisp_controller/config/models.py

@@ -30,7 +30,8 @@ def get_default_templates(self):
         """ see ``openwisp_controller.config.utils.get_default_templates_queryset`` """
         queryset = super(TemplatesVpnMixin, self).get_default_templates()
         assert self.device
-        return get_default_templates_queryset(self.device.organization_id, queryset=queryset)
+        return get_default_templates_queryset(self.device.organization_id,
+                                              queryset=queryset)
 
     @classmethod
     def clean_templates_org(cls, action, instance, pk_set, **kwargs):
@@ -98,6 +99,11 @@ class Meta(AbstractDevice.Meta):
         )
         abstract = False
 
+    def get_temp_config_instance(self, **options):
+        c = super(Device, self).get_temp_config_instance(**options)
+        c.device = self
+        return c
+
 
 class Config(TemplatesVpnMixin, AbstractConfig):
     """