diff --git a/abonapp/admin.py b/abonapp/admin.py
index bd5771b..64a0547 100644
--- a/abonapp/admin.py
+++ b/abonapp/admin.py
@@ -15,3 +15,4 @@ admin.site.register(models.ExtraFieldsModel)
 admin.site.register(models.AllPayLog)
 admin.site.register(models.Opt82)
 admin.site.register(models.PassportInfo)
+admin.site.register(models.AbonDevice)
diff --git a/abonapp/migrations/0018_auto_20170418_1236.py b/abonapp/migrations/0018_auto_20170418_1236.py
new file mode 100644
index 0000000..175a62b
--- /dev/null
+++ b/abonapp/migrations/0018_auto_20170418_1236.py
@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9 on 2017-04-18 09:36
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('abonapp', '0017_auto_20170416_1029'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='abondevice',
+            name='abon',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='abonapp.Abon'),
+        ),
+        migrations.AlterField(
+            model_name='abondevice',
+            name='device',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='devapp.Device'),
+        ),
+    ]
diff --git a/abonapp/models.py b/abonapp/models.py
index eb8ea64..1b1250f 100644
--- a/abonapp/models.py
+++ b/abonapp/models.py
@@ -331,15 +331,15 @@ class Abon(UserProfile):
 
 
 class AbonDevice(models.Model):
-    abon = models.OneToOneField(Abon)
-    device = models.OneToOneField('devapp.Device')
+    abon = models.ForeignKey(Abon)
+    device = models.ForeignKey('devapp.Device')
 
     def __str__(self):
         return "%s - %s" % (self.abon, self.device)
 
     class Meta:
         db_table = 'abon_device'
-        unique_together = (('abon', 'device'),)
+        unique_together = ('abon', 'device')
 
 
 class PassportInfo(models.Model):
diff --git a/abonapp/views.py b/abonapp/views.py
index 6e85a43..f27f387 100644
--- a/abonapp/views.py
+++ b/abonapp/views.py
@@ -660,12 +660,10 @@ def dev(request, gid, uid):
             dev = Device.objects.get(pk=request.POST.get('dev'))
             abon = models.Abon.objects.get(pk=uid)
             try:
-                abdev = models.AbonDevice.objects.get(device=dev)
-                abdev.abon = abon
-                abdev.save(update_fields=['abon'])
+                models.AbonDevice.objects.get(device=dev, abon=abon)
             except models.AbonDevice.DoesNotExist:
                 models.AbonDevice.objects.create(abon=abon, device=dev)
-            messages.success(request, _('Device has successfully attached'))
+                messages.success(request, _('Device has successfully attached'))
             return redirect('abonapp:abon_home', gid=gid, uid=uid)
         else:
             abon_dev = models.AbonDevice.objects.get(abon=uid).device