From 34fb909180e9df06fa6a993dd5696a49cd152a0b Mon Sep 17 00:00:00 2001
From: Berker Peksag <berker.peksag@gmail.com>
Date: Sun, 23 Nov 2014 20:33:07 +0200
Subject: Fixed #12982 -- Added a get_or_set() method to the BaseCache backend.

---
 django/core/cache/backends/base.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'django/core/cache')

diff --git a/django/core/cache/backends/base.py b/django/core/cache/backends/base.py
index 7ac1e5bc32..26113aaa31 100644
--- a/django/core/cache/backends/base.py
+++ b/django/core/cache/backends/base.py
@@ -147,6 +147,27 @@ class BaseCache(object):
                 d[k] = val
         return d
 
+    def get_or_set(self, key, default=None, timeout=DEFAULT_TIMEOUT, version=None):
+        """
+        Fetch a given key from the cache. If the key does not exist,
+        the key is added and set to the default value. The default value can
+        also be any callable. If timeout is given, that timeout will be used
+        for the key; otherwise the default cache timeout will be used.
+
+        Returns the value of the key stored or retrieved on success,
+        False on error.
+        """
+        if default is None:
+            raise ValueError('You need to specify a value.')
+        val = self.get(key, version=version)
+        if val is None:
+            if callable(default):
+                default = default()
+            val = self.add(key, default, timeout=timeout, version=version)
+            if val:
+                return self.get(key, version=version)
+        return val
+
     def has_key(self, key, version=None):
         """
         Returns True if the key is in the cache and has not expired.
-- 
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