From e391240c54f64ed6528b4e838efd775637e0b149 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=AE=D0=B7=D0=B5=D1=84=D0=BE=D0=B2=D0=B8=D1=87=20=D0=9D?=
 =?UTF-8?q?=D0=B8=D0=BA=D0=BE=D0=BB=D0=B0=D0=B9=20=D0=98=D0=B3=D0=BE=D1=80?=
 =?UTF-8?q?=D0=B5=D0=B2=D0=B8=D1=87?= <uni@skbkontur.ru>
Date: Thu, 4 Nov 2021 11:00:39 +0500
Subject: [PATCH] fix for #61;

---
 README.md                     |  2 +-
 netbox_bgp/api/serializers.py | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index bcf9448..62b0485 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ You can use older Netbox version with 0.3.9 version of this plugin.
 The plugin is available as a Python package in pypi and can be installed with pip  
 For NetBox 2.10 or 2.11: 
 ```
-pip install netbox-bgp=0.3.9
+pip install netbox-bgp==0.3.9
 ```
 For NetBox 3.0: 
 ```
diff --git a/netbox_bgp/api/serializers.py b/netbox_bgp/api/serializers.py
index 80e133b..bf73616 100644
--- a/netbox_bgp/api/serializers.py
+++ b/netbox_bgp/api/serializers.py
@@ -161,6 +161,21 @@ class BGPSessionSerializer(TaggedObjectSerializer, CustomFieldModelSerializer):
     class Meta:
         model = BGPSession
         fields = '__all__'
+        validators = []
+
+    def validate(self, attrs):
+        qs = BGPSession.objects.filter(
+            device=attrs.get('device'),
+            local_as=attrs.get('local_as'),
+            local_address=attrs.get('local_address'),
+            remote_as=attrs.get('remote_as'),
+            remote_address=attrs.get('remote_address'),
+        )
+        if qs.exists():
+            raise ValidationError(
+                {'error': 'BGP Session with this Device, Local address, Local AS, Remote address and Remote AS already exists.'}
+            )
+        return attrs
 
     def to_representation(self, instance):
         ret = super().to_representation(instance)