Backlinks changes

djangoldp_notification/migrations/0003_auto_20200429_1346.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11 on 2020-04-29 13:46
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('djangoldp_notification', '0002_auto_20190917_1107'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='notification',
+            name='allow_create_backlink',
+            field=models.BooleanField(default=True, help_text='set to False to disable backlink creation after Model save'),
+        ),
+        migrations.AddField(
+            model_name='subscription',
+            name='allow_create_backlink',
+            field=models.BooleanField(default=True, help_text='set to False to disable backlink creation after Model save'),
+        ),
+    ]

djangoldp_notification/migrations/0004_auto_20200501_1207.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11 on 2020-05-01 12:07
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('djangoldp_notification', '0003_auto_20200429_1346'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='notification',
+            name='backlink_created',
+            field=models.BooleanField(default=False, help_text='set automatically to indicate the Model is a backlink'),
+        ),
+        migrations.AddField(
+            model_name='subscription',
+            name='backlink_created',
+            field=models.BooleanField(default=False, help_text='set automatically to indicate the Model is a backlink'),
+        ),
+    ]

djangoldp_notification/migrations/0005_auto_20200505_1733.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11 on 2020-05-05 17:33
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('djangoldp_notification', '0004_auto_20200501_1207'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='notification',
+            old_name='backlink_created',
+            new_name='is_backlink',
+        ),
+        migrations.RenameField(
+            model_name='subscription',
+            old_name='backlink_created',
+            new_name='is_backlink',
+        ),
+    ]

djangoldp_notification/models.py

@@ -12,7 +12,6 @@ from django.utils.translation import ugettext_lazy as _
 from djangoldp.fields import LDPUrlField
 from djangoldp.models import Model
 from threading import Thread
-
 from djangoldp_notification.middlewares import MODEL_MODIFICATION_USER_FIELD
 from djangoldp_notification.permissions import InboxPermissions, SubscriptionsPermissions
 
@@ -63,6 +62,31 @@ class Subscription(Model):
         authenticated_perms = ["add", "view", "delete"]
         permission_classes = [SubscriptionsPermissions]
 
+    def save(self, *args, **kwargs):
+        # save subscriptions for nested fields
+        if self.pk is None and not self.is_backlink and self.object.startswith(settings.SITE_URL):
+            try:
+                # object is a WebID.. convert to local representation
+                local = Model.resolve(self.object.replace(settings.SITE_URL, ''))[0]
+                nested_fields = Model.get_meta(local, 'nested_fields', [])
+
+                for nested_field in nested_fields:
+                    nested_url = str(self.object) + '1/' + nested_field + '/'
+
+                    # we have the nested_url, but we want the model contained within's container
+                    nested_container = Model.resolve(nested_url)[0]
+                    nested_container_url = Model.absolute_url(nested_container)
+
+                    # check a Subscription on this pair doesn't exist already
+                    existing_subscriptions = Subscription.objects.filter(object=nested_container_url, inbox=self.inbox)
+                    # save a Subscription on this container
+                    if not existing_subscriptions.exists():
+                        Subscription.objects.create(object=nested_container_url, inbox=self.inbox, is_backlink=True)
+            except:
+                pass
+
+        super(Subscription, self).save(*args, **kwargs)
+
 # --- SUBSCRIPTION SYSTEM ---
 @receiver(post_save, dispatch_uid="callback_notif")
 def send_notification(sender, instance, created, **kwargs):
@@ -76,9 +100,10 @@ def send_notification(sender, instance, created, **kwargs):
 
         # dispatch a notification for every Subscription on this resource
         for subscription in Subscription.objects.filter(models.Q(object=url_resource) | models.Q(object=url_container)):
-            process = Thread(target=send_request, args=[subscription.inbox, url_resource, instance, created])
-            process.start()
-            threads.append(process)
+            if not instance.is_backlink:
+                process = Thread(target=send_request, args=[subscription.inbox, url_resource, instance, created])
+                process.start()
+                threads.append(process)
 
 
 def send_request(target, object_iri, instance, created):