How would I go about mapping an array of hashes that are nested inside of an array??? I need to get an array returned for each :hours for each month, so I can then use the median method and get an average for each month. I can do it in the views, but using
<% @sleep_months.each do |month, sleep| %>
<ul><%= month.strftime("%B") %>
<% for sleeps in sleep %>
<li><%= sleeps.hours %></li>
<% end %>
</ul>
<% end %>
I don't want to use this way as it's not very concise for controller code. Please let me know if there is a ruby method other than map, or show me the correct way to use map to
def index
# Sleep.all for current_user
@sleeps = current_user.sleeps
# Sleep grouped and sorted in order by month
@sleep_months = @sleeps.group_by { |s| s.beginning_of_month }.sort { |a,b| a[0] <=> b[0] }
# returns ["Jan", "Feb", "Mar", "Jun", "Oct", "Nov"], GREAT!
@array_for_average_sleep_months = @sleep_months.map { |month, sleep| month.strftime("%b") }
@array_for_hours_slept_per_month = ?????
# ????? for array of hours of sleep per month to
@monthly_average_sleep_time = median(@array_for_hours_slept_per_month)
raise
respond_to do |format|
format.html { render action: 'index' }
format.js
end
end
def median(array)
if array.empty?
current_user.sleeps.new
else
sorted = array.sort
len = sorted.length
return (sorted[(len - 1) / 2] + sorted[len / 2]) / 2.0
end
end
data looks like this from @sleep_months:
[[Tue, 01 Jan 2013, [#<Sleep id: 10, user_id: 1, hours: 6, created_at: "2013-06-24 02:35:15", updated_at: "2013-06-24 02:35:15", sleep_date: "2013-01-01">]], [Fri, 01 Feb 2013, [#<Sleep id: 11, user_id: 1, hours: 9, created_at: "2013-06-24 02:36:38", updated_at: "2013-06-24 02:36:38", sleep_date: "2013-02-06">, #<Sleep id: 15, user_id: 1, hours: 7, created_at: "2013-06-24 02:38:31", updated_at: "2013-06-24 02:38:31", sleep_date: "2013-02-20">]]