Methods
Instance Public methods
fragment_cache_key(value = nil, &key)
Allows you to specify controller-wide key prefixes for cache fragments. Pass either a constant value, or a block which computes a value each time a cache key is generated.
For example, you may want to prefix all fragment cache keys with a global version identifier, so you can easily invalidate all caches.
class ApplicationController
fragment_cache_key "v1"
end
When it’s time to invalidate all fragments, simply change the string constant. Or, progressively roll out the cache invalidation using a computed value:
class ApplicationController
fragment_cache_key do
@account.id.odd? ? "v1" : "v2"
end
end
📝 Source code
# File actionpack/lib/abstract_controller/caching/fragments.rb, line 59
def fragment_cache_key(value = nil, &key)
self.fragment_cache_keys += [key || -> { value }]
end