caching - Expiring all caches on a controller -

i got resourceful controller custom action. action pretty heavy, i'm working on caching it:

class mycontroller < applicationcontroller   caches_action :walk_to_mordor    # /my/:id/walk_to_mordor/:direction   def walk_to_mordor     # srz bzns   end end 

it works nice, caching done , page fast. however, want allow user "bust" cache clicking on link on page. @ first tried:

def bust_cache   expire_action :action => :walk_to_mordor end 

rails complained no route matches action. might because of parameter. hmm, let's give him:

def bust_cache   myentities.all.each |e|     expire_action walk_to_mordor_path(e, ??)   end end 

problem, can't possibly identify choices of :direction.

is there way clear action caches match regular expression, or action caches specific controller?

the secret called expire_fragment:

expire_fragment(key, options = nil)

removes fragments cache.

key can take 1 of 3 forms:

• string - take form of path, "pages/45/notes".

• hash - treated implicit call url_for, {:controller => "pages", :action => "notes", :id => 45}

• regexp - remove fragment matches, %r{pages/d*/notes} might remove notes. make sure don’t use anchors in regex (^ or $) because actual filename matched looks ./cache/filename/path.cache. note: regexp expiration supported on caches can iterate on keys (unlike memcached).

http://api.rubyonrails.org/classes/actioncontroller/caching/fragments.html#method-i-expire_fragment

sadly, won't work memcached (if ever decide use it). gotta lot more clever avoid cache in circunstance. maybe adding serial parameter request, , increment when user presses 'bust cache' button...