Invalidating beaker cache entries

[Tony Cebzanov]

I like the flexibility of the beaker cache, but am having trouble
accomplishing exactly what I want. I understand that if I use the
@cache.cache or @cache.region decorators, I automatically get caching
based on the function arguments. That's fantastic! But, the one area
it's getting me into trouble is the situation where I need to
invalidate all cache entries matching only a subset of the function
arguments.

Here's a short example of what I mean. Assume the following
controller function that gets widgets from the database based on their
color and size:

def widgets(self, color, size):

@cache.region('short_term')
def get_widgets(color, size):
# query the database
return widgets

Suppose this cache is built up with all the widgets in the database.
Now, I add a blue widget, so I'd like to invalidate the cache for the
get_widgets() function for *all* blue widgets. It seems to me that
I'd have to repeatedly call invalidate_region(), enumerating all
possible widget sizes, e.g.:

invalidate_region(get_widgets, 'short_term', 'blue', 'small')
invalidate_region(get_widgets, 'short_term', 'blue', 'medium')

etc. Is this what I'd have to do? Because when the arguments aren't
so discrete, this would be a big problem. Is there some easier way to
tell beaker to invalidate *all* entries that match a specific argument
(or combination of arguments)? And, if not, does anyone think this
would be a good inclusion for a future version of beaker?

Thanks.

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