group_cache_key¶ ↑

Using this gem in an application using ActiveRecord will provide you with a ‘cache_key’ method on collections of models.

The ‘cache_key’ will consist of:

• the tableized name of the class of the first item

• an MD5 hash of the ids in the collection

• to_i on the max created_at date

• to_i on the max updated_at date

The ‘cache_key’ should look like:

'widgets/100-81dc9bdb52d04dc20036dbd8313ed055-1256853629-1256853637'

The resulting cache_key will be different if your group is sorted differently because the MD5 hash is created according to the order given: no sorting is done to create the hash.

If your collection is empty, the cache_key will return a key with the object_id. A cache_key for an empty collection will look like:

'empty/13149280'

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Copyright © 2009 Jim Gay. See LICENSE for details.