Fixes: 1) Corrected products' filtering options on interfaces

core/graphene/schema.py

@@ -155,6 +155,7 @@ class Query(ObjectType):
                 is_active=True,
                 brand__is_active=True,
                 category__is_active=True,
+                stocks__isnull=False,
                 stocks__vendor__is_active=True,
             )
             .select_related("brand", "category")

core/managers.py

@@ -4,6 +4,7 @@ import requests
 from constance import config
 from django.contrib.gis.geos import Point
 from django.db import models
+from modeltranslation.manager import MultilingualManager
 
 logger = logging.getLogger("django")
 
@@ -64,10 +65,14 @@ class AddressManager(models.Manager):
         )[0]
 
 
-class ProductManager(models.Manager):
+class ProductManager(MultilingualManager):
     def available(self):
         return self.filter(
-            is_active=True, brand__is_active=True, category__is_active=True, stocks__vendor__is_active=True
+            is_active=True,
+            brand__is_active=True,
+            category__is_active=True,
+            stocks__isnull=False,
+            stocks__vendor__is_active=True,
         )
 
     def available_in_stock(self):
@@ -75,6 +80,7 @@ class ProductManager(models.Manager):
             is_active=True,
             brand__is_active=True,
             category__is_active=True,
+            stocks__isnull=False,
             stocks__vendor__is_active=True,
             stocks__quantity__gt=0,
         )

core/viewsets.py

@@ -544,6 +544,7 @@ class ProductViewSet(EvibesViewSet):
             is_active=True,
             brand__is_active=True,
             category__is_active=True,
+            stocks__isnull=False,
             stocks__vendor__is_active=True,
         )