add pk in quota activate

apps/pos_device/models.py

@@ -1,3 +1,6 @@
+import random
+import string
+
 from apps.authentication.models import Organization
 from django.contrib.postgres.fields import ArrayField
 from apps.authorization.models import UserRelations
@@ -24,6 +27,7 @@ class ProviderCompany(BaseModel):
 
 
 class Device(BaseModel):
+    device_identity = models.CharField(max_length=25, null=True)
     acceptor = models.IntegerField(default=0)
     terminal = models.IntegerField(default=0)
     serial = models.TextField(null=True)
@@ -45,6 +49,15 @@ class Device(BaseModel):
     def save(self, *args, **kwargs):
         return super(Device, self).save(*args, **kwargs)
 
+    def generate_device_identity(self):
+        """ generate identity for every device """
+        prefix = "POS"
+        while True:
+            number_part = ''.join(random.choices(string.digits, k=6))
+            code = f"{prefix}{number_part}"
+            if not self.objects.filter(short_code=code).exists():
+                return code
+
 
 class DeviceVersion(BaseModel):
     device = models.ForeignKey(