ok so i have
>> list = Request.find_all_by_artist(\"someBand\") => [#
There is a gem for that: groupdate.
Usage (from the docs):
User.group_by_day(:created_at).count # { # 2013-04-16 00:00:00 UTC => 50, # 2013-04-17 00:00:00 UTC => 100, # 2013-04-18 00:00:00 UTC => 34 # }