rails/cache_digests — pull request #25 by jamis (2013-01-07 17:56:07+00:00)
Title: Allow template dependencies to be specified programmatically

This lets you control the created digest programmatically, for instance
when a different template was selected even though the format and
virtual path are the same.

You, um, could say that this is "dependency injection." :syringe:

Example use:

```ruby
if agent_is_phone?
# change the generation of the template digest
CacheDigests.dependencies << "phone"
# change where the new digest is itself cached
CacheDigests::TemplateDigestor.cache_prefix = "phone"
end

yield

CacheDigests.dependencies.clear
CacheDigests::TemplateDigestor.cache_prefix = nil
```