fixed bug. also slightly optimized other signal

feed/constants.py

@@ -0,0 +1,4 @@
+from projects.models import Project
+from vacancy.models import Vacancy
+
+SIGNALS_MODELS = Vacancy | Project

feed/services.py

@@ -0,0 +1,16 @@
+from django.contrib.contenttypes.models import ContentType
+
+from feed.constants import SIGNALS_MODELS
+from news.models import News
+
+
+def delete_news_for_model(instance: SIGNALS_MODELS):
+    content_type = ContentType.objects.get_for_model(instance)
+    obj = News.objects.filter(content_type=content_type, object_id=instance.id).first()
+    if obj:
+        obj.delete()
+
+
+def create_news_for_model(instance: SIGNALS_MODELS):
+    content_type = ContentType.objects.get_for_model(instance)
+    News.objects.get_or_create(content_type=content_type, object_id=instance.id)

feed/signals.py

@@ -1,17 +1,33 @@
-from django.contrib.contenttypes.models import ContentType
-from django.db.models.signals import post_save
+from django.db.models.signals import post_save, post_delete
 from django.dispatch import receiver
 
-from news.models import News
-
+from feed.services import create_news_for_model, delete_news_for_model
+from projects.models import Project
 
 from vacancy.models import Vacancy
 
 
 @receiver(post_save, sender=Vacancy)
 def create_news_on_save(sender, instance, created, **kwargs):
-    if created:
-        content_type = ContentType.objects.filter(model="vacancy").first()
-        news_instance, created = News.objects.get_or_create(
-            content_type=content_type, object_id=instance.id
-        )
+    if instance.is_active:
+        create_news_for_model(instance)
+    else:
+        delete_news_for_model(instance)
+
+
+@receiver(post_delete, sender=Vacancy)
+def delete_news_vacancy(sender, instance, **kwargs):
+    delete_news_for_model(instance)
+
+
+@receiver(post_save, sender=Project)
+def create_news_on_created_project(sender, instance, created, **kwargs):
+    if not instance.draft:
+        create_news_for_model(instance)
+    else:
+        delete_news_for_model(instance)
+
+
+@receiver(post_delete, sender=Project)
+def delete_news_project(sender, instance, **kwargs):
+    delete_news_for_model(instance)

feed/views.py

@@ -59,25 +59,36 @@ def get(self, *args, **kwargs):
 
 class DevScript(CreateAPIView):
     def create(self, request):
-        content_type = ContentType.objects.filter(model="project").first()
+        content_type_project = ContentType.objects.filter(model="project").first()
         for project in Project.objects.filter(draft=False):
             if not News.objects.filter(
-                content_type=content_type, object_id=project.id
+                content_type=content_type_project, object_id=project.id
             ).exists():
                 News.objects.create(
-                    content_type=content_type,
+                    content_type=content_type_project,
                     object_id=project.id,
                     datetime_created=project.datetime_created,
                 )
 
-        content_type = ContentType.objects.filter(model="vacancy").first()
+        content_type_vacancy = ContentType.objects.filter(model="vacancy").first()
         for vacancy in Vacancy.objects.filter(is_active=True):
             if not News.objects.filter(
-                content_type=content_type, object_id=vacancy.id
+                content_type=content_type_vacancy, object_id=vacancy.id
             ).exists():
                 News.objects.create(
-                    content_type=content_type,
+                    content_type=content_type_vacancy,
                     object_id=vacancy.id,
                     datetime_created=vacancy.datetime_created,
                 )
+
+        news_to_delete = list(
+            News.objects.filter(
+                content_type__in=[content_type_vacancy, content_type_project]
+            )
+        )
+
+        for news in news_to_delete:
+            if not news.content_object:
+                news.delete()
+
         return Response({"status": "success"}, status=201)

projects/models.py

@@ -2,14 +2,13 @@
 
 from django.contrib.auth import get_user_model
 from django.contrib.contenttypes.fields import GenericRelation
-from django.contrib.contenttypes.models import ContentType
 from django.db import models
 from django.db.models import UniqueConstraint
 
 from core.models import Like, View
 from files.models import UserFile
 from industries.models import Industry
-from news.models import News
+
 from projects.constants import VERBOSE_STEPS
 from projects.managers import AchievementManager, CollaboratorManager, ProjectManager
 from users.models import CustomUser
@@ -135,16 +134,6 @@ def get_collaborators_user_list(self) -> list[User]:
     def __str__(self):
         return f"Project<{self.id}> - {self.name}"
 
-    def save(
-        self, force_insert=False, force_update=False, using=None, update_fields=None
-    ):
-        if not self.draft:
-            content_type = ContentType.objects.filter(model="project").first()
-            news_instance, created = News.objects.get_or_create(
-                content_type=content_type, object_id=self.id
-            )
-        super().save(force_insert, force_update, using, update_fields)
-
     class Meta:
         ordering = ["-hidden_score", "-datetime_created"]
         verbose_name = "Проект"

projects/signals.py

@@ -12,9 +12,7 @@ def create_project(sender, instance, created, **kwargs):
     """
 
     if not instance.draft:
-        # if not a draft, check if project chat exists and if not create it
-        if not ProjectChat.objects.filter(project=instance).exists():
-            ProjectChat.objects.create(project=instance)
+        ProjectChat.objects.get_or_create(project=instance)
 
     if created:
         Collaborator.objects.create(