[Rails] multidimensional Array or Hash with group_by 'created_at'

Hello,
i want to create a multidimensional Array or Hash with group_by
'created_at'.

3 dimensions needed:
myArray[week][day][data]

currently i only created it with 2 dimesions:

#model
def self.group_per_day
all.group_by{|t| t.created_at.strftime("%d. %B, %Y")}.sort #"%U" for
Weeks
end

#controller
@pdf_activities = Activity.group_per_day

#view
-@pdf_activities.each do |day|
=day[0]
-day[1].each do |activity|
=activity.activity

thanks

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