Overloading the python-memcahce delete() function in a django project since it isn't supported.

cache.delete

Initially wanted to do this:



from django.core.cache.backends.memcached import CacheClass

class DeletableCache(object):
    """
    The memcache library doesnt seem to support delete. This is a mixin to fake it.
    
    In [3]: cache.set('oo', 123, 1000)
    
    In [4]: cache.get('oo')
    Out[4]: 123

    In [5]: cache.delete('oo')

    In [6]: cache.get('oo')
    Out[6]: 123
    """
    
    def delete(self, key):
        """
        We will invalidate by setting the time-to-live to -1 second, effectivly deleting it.
        """
        print 'deleting %s' %key
        self.set(key, None, -1)
        
CacheClass.__bases__ += (DeletableCache,)








But you can't overload existing methods using mixins, so I did the following which works:



from django.core.cache.backends.memcached import CacheClass

def delete(self, key):
    """
    The memcache library doesnt seem to support delete. This is a mixin to fake it.
    
    In [3]: cache.set('oo', 123, 1000)
    
    In [4]: cache.get('oo')
    Out[4]: 123

    In [5]: cache.delete('oo')

    In [6]: cache.get('oo')
    Out[6]: 123
    
    We will invalidate by setting the time-to-live to -1 second, effectivly deleting it.
    """
    self.set(key, None, -1)

setattr(CacheClass, 'delete', delete)






Output:



In [1]: from django.core.cache import cache

In [2]: cache.set('oo', 123, 10000)

In [3]: cache.get('oo')
Out[3]: 123

In [4]: cache.delete('oo')
deleting oo

In [5]: cache.get('oo')