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-rw-r--r--pym/cache/template.py9
1 files changed, 8 insertions, 1 deletions
diff --git a/pym/cache/template.py b/pym/cache/template.py
index a628b1161..4ffd9b9ef 100644
--- a/pym/cache/template.py
+++ b/pym/cache/template.py
@@ -114,7 +114,14 @@ class database(object):
raise NotImplementedError
def __contains__(self, cpv):
- raise NotImplementedError
+ """This method should always be overridden. It is provided only for
+ backward compatibility with modules that override has_key instead. It
+ will automatically raise a NotImplementedError if has_key has not been
+ overridden."""
+ if self.has_key is database.has_key:
+ # prevent a possible recursive loop
+ raise NotImplementedError
+ return self.has_key(cpv)
def get(self, k, x=None):
try: