Time Difference of One Item, Two Fields, Grouped by Days - Rails - ruby-on-rails

Question

Controller
#clock_events = ClockEvent.where(user_id: current_user.id)
#clock_event_days = #clock_events.group_by { |t| t.clock_in.beginning_of_day }
#clock_out = ClockEvent.where(user_id: current_user.id, clock_out: nil).last
View
<% if #clock_events.exists? %>
<div class="row">
<% #clock_event_days.each do |day, clock_events| %>
<div class="col-md-6">
<div class="list-group">
<h4 class="list-group-item-heading"><%= day.strftime("%A, %B #{day.day.ordinalize}") %></h4>
<% clock_events.each do |clock_event| %>
<p class="list-group-item-text time-group">
<%= clock_event.clock_in.strftime("%l:%M%p") %>
<% if clock_event.clock_out.present? %>
-
<%= clock_event.clock_out.strftime("%l:%M%p") %> -
<%= sprintf "%.2f", ((clock_event.clock_out - clock_event.clock_in) / 1.hour) %> hrs
<% end %>
</p>
<% end %>
</div>
<div class="daily-total">
<strong>Total: **need total here**</strong><br>
</div>
</div>
<% end %>
</div>
<% end %>
Result
Friday, February 17th
5:15PM - 6:15PM - 1.00 hrs
5:29PM - 5:41PM - 0.21 hrs
5:49PM - 6:45PM - 0.94 hrs
6:49PM - 6:49PM - 0.00 hrs
6:50PM - 6:57PM - 0.11 hrs
Total:
Saturday, February 18th
4:45PM - 4:52PM - 0.11 hrs
Total:
Can some one help me get the total hours for each day and then for the entire week (Friday-Thursday)?
I am guessing I should be using the model for getting the time difference instead of using the view...but I can't seem to figure it out.

Answer 1

Putting a variable to track this in the view is the most straightforward solution, even if it's maybe not the most elegant one.
<% total_hours = 0 %>
<% clock_events.each do |clock_event| %>
<% total_hours += (clock_event.clock_out - clock_event.clock_in) %>
<% end %>
and then output it
<strong>Total: <%= total_hours / 1.hour %></strong><br>
Edit 1:
You could also clean things up a bit by adding this in the model, something like
class ClockEvent < ApplicationRecord
# ..
def duration
clock_out - clock_in
end
end
and use that in the view
<% total_hours += clock_event.duration %>
...
<%= sprintf "%.2f hrs", (clock_event.duration / 1.hour) %>
Edit 2:
You can clean it up even more by skipping the total_hours variable all together and do this.
<%= clock_events.sum(&:duration) / 1.hour %>