From 06a5cba50ed134699caf74a378f8de2af78a3c41 Mon Sep 17 00:00:00 2001
From: PCoder <purple.coder@yahoo.co.uk>
Date: Sat, 28 Oct 2017 18:28:14 +0200
Subject: [PATCH] Add contains utility method

---
 hosting/models.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/hosting/models.py b/hosting/models.py
index 78743edc..d6367301 100644
--- a/hosting/models.py
+++ b/hosting/models.py
@@ -302,3 +302,23 @@ class UserCardDetail(AssignPermissionsMixin, models.Model):
             card.save()
         user_card_detail.preferred = True
         user_card_detail.save()
+
+    @staticmethod
+    def contains(stripe_customer, card_details):
+        """
+        A utility function to check whether a StripeCustomer is already
+        associated with the card having given details
+        :param stripe_customer:
+        :param card_details:
+        :return:
+        """
+        try:
+            UserCardDetail.objects.get(
+                stripe_customer=stripe_customer,
+                fingerprint=card_details['fingerprint'],
+                exp_month=card_details['exp_month'],
+                exp_year=card_details['exp_year']
+            )
+            return True
+        except UserCardDetail.DoesNotExist:
+            return False