Add queryset mixin

Switch view in urls/common
Add homepage view
Switch test

apps/collection/models.py

@@ -8,6 +8,8 @@ from django.utils.translation import gettext_lazy as _
 from utils.models import ProjectBaseMixin, URLImageMixin
 from utils.models import TranslatedFieldsMixin
 
+from utils.querysets import RelatedObjectsCountMixin
+
 
 # Mixins
 class CollectionNameMixin(models.Model):
@@ -30,7 +32,7 @@ class CollectionDateMixin(models.Model):
 
 
 # Models
-class CollectionQuerySet(models.QuerySet):
+class CollectionQuerySet(RelatedObjectsCountMixin):
     """QuerySet for model Collection"""
 
     def by_country_code(self, code):

apps/collection/tests.py

@@ -8,6 +8,7 @@ from http.cookies import SimpleCookie
 from collection.models import Collection, Guide
 from location.models import Country
 
+from establishment.models import Establishment, EstablishmentType
 # Create your tests here.
 
 
@@ -81,3 +82,24 @@ class CollectionGuideDetailTests(CollectionDetailTests):
     def test_guide_detail_Read(self):
         response = self.client.get(f'/api/web/collections/guides/{self.guide.id}/', format='json')
         self.assertEqual(response.status_code, status.HTTP_200_OK)
+
+
+class CollectionWebHomeTests(CollectionDetailTests):
+    def setUp(self):
+        super().setUp()
+        self.establishment_type = EstablishmentType.objects.create(name="Test establishment type")
+
+        self.establishment = Establishment.objects.create(
+            name="Test establishment",
+            establishment_type_id=self.establishment_type.id,
+            is_publish=True,
+            slug="test"
+        )
+
+        self.establishment.collections.add(self.collection)
+        self.establishment.save()
+
+    def test_collection_list_filter(self):
+        print("========================================================================================")
+        response = self.client.get('/api/web/collections/', format='json')
+        self.assertEqual(response.status_code, status.HTTP_200_OK)

apps/collection/urls/common.py

@@ -6,7 +6,7 @@ from collection.views import common as views
 app_name = 'collection'
 
 urlpatterns = [
-    path('', views.CollectionListView.as_view(), name='list'),
+    path('', views.CollectionHomePageView.as_view(), name='list'),
     path('<slug:slug>/establishments/', views.CollectionEstablishmentListView.as_view(),
          name='detail'),
 

apps/collection/views/common.py

@@ -30,10 +30,28 @@ class CollectionListView(CollectionViewMixin, generics.ListAPIView):
 
     def get_queryset(self):
         """Override get_queryset method"""
-        return models.Collection.objects.published()\
+        queryset = models.Collection.objects.published()\
             .by_country_code(code=self.request.country_code)\
             .order_by('-on_top', '-created')
 
+        return queryset
+
+
+class CollectionHomePageView(CollectionViewMixin, generics.ListAPIView):
+    """List Collection view"""
+    permission_classes = (permissions.AllowAny,)
+    serializer_class = serializers.CollectionSerializer
+
+    def get_queryset(self):
+        """Override get_queryset method"""
+        queryset = models.Collection.objects.published()\
+            .by_country_code(code=self.request.country_code)\
+            .annotate_related_objects_count() \
+            .filter_related_gt(3) \
+            .order_by('-on_top', '-created')
+
+        return queryset
+
 
 class CollectionEstablishmentListView(CollectionListView):
     """Retrieve list of establishment for collection."""

apps/utils/querysets.py

@@ -1,5 +1,6 @@
 """Utils QuerySet Mixins"""
 from django.db import models
+from django.db.models import Q
 
 from utils.methods import get_contenttype
 
@@ -15,3 +16,31 @@ class ContentTypeQuerySetMixin(models.QuerySet):
         """Filter QuerySet by ContentType."""
         return self.filter(content_type=get_contenttype(app_label=app_label,
                                                         model=model))
+
+
+class RelatedObjectsCountMixin(models.QuerySet):
+    """QuerySet for ManyToMany related count filter"""
+
+    def get_related_objects_names(self):
+        related_objects_names = []
+
+        for related_object in self.model._meta.related_objects:
+            if isinstance(related_object, models.ManyToManyRel):
+                related_objects_names.append(related_object.name)
+
+        return related_objects_names
+
+    def annotate_related_objects_count(self):
+
+        annotations = {}
+        for related_object in self.get_related_objects_names():
+            annotations[f"{related_object}_count"] = models.Count(f"{related_object}")
+
+        return self.annotate(**annotations)
+
+    def filter_related_gt(self, count):
+        q_objects = Q()
+        for related_object in self.get_related_objects_names():
+            q_objects.add(Q(**{f"{related_object}_count__gt": count}), Q.OR)
+
+        return self.filter(q_objects)