cache.clear() not available inside a view function

[chrkr]

cache.clear() raises NotImplementedError during request/view processing between debug toolbar middleware request processing and debug toolbar middleware response processing.

This is a copy of my message in closed issue #570:

It took me all of 10 minutes to find out why this was happening in my project, inside a view function:

• the cache panel replaces the default cache (and the get_cache) function during the request middleware processing with CacheStatTracker/a function returning CacheStatTracker
• processing continues until the actual view function is called
• cache.clear() is called inside the view function, on CacheStatTracker
• CacheStatTracker has no clear() method, but has inherited the clear() method from BaseCache
• clear() is called on BaseCache
• BaseCache raises NotImplementedError

You won't find this occurring outside a view function, because on the way back out, the processing passes through the debug toolbar middleware again, this time calling disable_instrumentation on the cache panel, which replaces the cache/get_cache with the original values again.

[aaugustin]

If I understand correctly, the fix is simply to proxy clear in CacheStatTracker?

[chrkr]

Yes that should fix it.

[aaugustin]

Excellent.

PS: sorry for taking three months to answer — I don't look at this repository very often.