Unify api serializers (#16)

netbox_slm/models.py

@@ -9,7 +9,7 @@ from utilities.querysets import RestrictedQuerySet
 class SoftwareProduct(NetBoxModel):
     name = models.CharField(max_length=128)
     description = models.CharField(max_length=255, null=True, blank=True)
-    
+
     manufacturer = models.ForeignKey(
         to='dcim.Manufacturer',
         on_delete=models.PROTECT,
@@ -89,4 +89,4 @@ class SoftwareProductInstallation(NetBoxModel):
         return self.device or self.virtualmachine
 
     def render_type(self):
-        return f"{'device' if self.device else 'virtualmachine'}"
+        return 'device' if self.device else 'virtualmachine'