Counter cache on a habtm relation?

Question

Is it possible to use counter cache on a habtm relation in rails 3 ?

I really need it to speed up my application.

Answer 1

There is no built in method for HABTM but it is simple to make your own counter cache (actually I was doing it many times before I've invented counter_cache.

Or use has_many :throught instead of HABTM association. I never use HABTM because it looks awkward for me.

Related topic:

counter_cache with has_many :through