some first models of pos & add required to attributes

apps/authentication/signals.py

@@ -1,11 +1,43 @@
 from django.db.models import Sum
 from apps.product.models import QuotaDistribution
 from apps.warehouse.models import InventoryQuotaSaleTransaction
+from apps.authentication.models import Organization, OrganizationStats
 from django.db.models.signals import post_save, post_delete
 from django.dispatch import receiver
 
 
+def update_organization_stats(instance: Organization):
+    """ update all stats of organization from quota """
+
+    if hasattr(instance, 'stats'):
+        stat = instance.stats
+    else:
+        stat = OrganizationStats.objects.create(organization=instance)
+
+    # set organization stats from quotas, distributions transactions & etc
+    stat.total_quota_received = instance.assigned_quotas.count()
+    stat.active_quotas_weight = instance.assigned_quotas.filter(is_closed=False).count()
+    stat.closed_quotas_weight = instance.assigned_quotas.filter(is_closed=True).count()
+    stat.total_distributed = instance.distributions.count()
+    stat.total_inventory_in = instance.inventory.count()
+    stat.total_sold = instance.distributions.all().aggregate(
+        total_sold=Sum('been_sold')
+    )['total_sold'] or 0
+
+    stat.save(update_fields=[
+        "total_quota_received",
+        "active_quotas_weight",
+        "closed_quotas_weight",
+        "total_distributed",
+        "total_inventory_in",
+        "total_sold",
+    ])
+
+
 @receiver([post_save, post_delete], sender=QuotaDistribution)
 @receiver([post_save, post_delete], sender=InventoryQuotaSaleTransaction)
-def update_organization_stats(sender, instance, **kwargs):
-    pass
+def organization_stats(sender, instance, **kwargs):
+    if sender == QuotaDistribution:
+        update_organization_stats(instance.assigned_organization)
+    elif sender == InventoryQuotaSaleTransaction:
+        update_organization_stats(instance.inventory_entry.organization)