How to populate a week - ruby-on-rails

Question

I am building a Rails 3.2.14 app and I need to generate data from the database.
In this system I got 2 models (Project and Timereport).
Timereport is a polymorphic model (timereportable) and it got a table called total_time (in seconds).
Project has_many timereports.
What I need to achieve is to print out the total time for each projects split out on a week.
Like the illustration below:
-------------------------------------------------------------
| PROJECT | Mon | Tue | Wed | Thu | Fri | Sat | Sun | Total |
-------------------------------------------------------------
| Drill | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 14.0 |
-------------------------------------------------------------
| Saw | 1.0 | 2.0 | 2.0 | 0.0 | 0.0 | 2.0 | 2.0 | 9.0 |
-------------------------------------------------------------
I tried it like this and it works but it feels very uneffective.
<div class="table-responsive">
<table class="table table-bordered table-striped">
<tr>
<th>Project</th>
<th>Mon</th>
<th>Tue</th>
<th>Wed</th>
<th>Thu</th>
<th>Fri</th>
<th>Sat</th>
<th>Sun</th>
<th>Total</th>
</tr>
<tbody>
<% projects.each do |project| %>
<%
data = project.timereports.group("date(created_at)")
data = data.created_between(Time.zone.now.beginning_of_week, Time.zone.now.end_of_week)
data = data.order("date(created_at) ASC")
data = data.select("date (created_at) as date, sum(total_time) as seconds")
data.each do |post|
day = Date.parse(post[:date]).strftime("%A")
if (weekday == "Monday")
#days[:mon] += seconds
elsif (weekday == "Tuesday")
#days[:tue] += seconds
elsif (weekday == "Wednesday")
#days[:wed] += seconds
elsif (weekday == "Thursday")
#days[:thu] += seconds
elsif (weekday == "Friday")
#days[:fri]+= seconds
elsif (weekday == "Saturday")
#days[:sat] += seconds
elsif (weekday == "Sunday")
#days[:sun] += seconds
end
end
%>
<tr>
<td><%= link_to project.title.capitalize, admin_projects_path(project) %></td>
<td><%= split_time_simple #days[:mon] %></td>
<td><%= split_time_simple #days[:tue] %></td>
<td><%= split_time_simple #days[:wed] %></td>
<td><%= split_time_simple #days[:thu] %></td>
<td><%= split_time_simple #days[:fri] %></td>
<td><%= split_time_simple #days[:sat] %></td>
<td><%= split_time_simple #days[:sun] %></td>
<td><%= split_time_simple #days[:mon] + #days[:tue] + #days[:wed] + #days[:thu] + #days[:fri] + #days[:sat] + #days[:sun] %></td>
</tr>
<% end %>
</tbody>
</table>
Update
The above code "works" but I suspect that it is deeply inefficient. Is there a better way?

Answer 1

It's not optimal solution (I use weekly_report and not sure if Rails will cache it, probably not) but way better that original.
project.rb:
def weekly_report
self.timereports.group("date(created_at)") \
.created_between(Time.zone.now.beginning_of_week, Time.zone.now.end_of_week) \
.order("date(created_at) ASC") \
.select("date (created_at) as date, sum(total_time) as seconds")
end
controller:
#projects = Project.all # or whatever else the criteria is
view:
<div class="table-responsive">
<table class="table table-bordered table-striped">
<tbody>
<% projects.each do |project| %>
<tr>
<td><%= link_to project.title.capitalize, admin_projects_path(project) %></td>
<%= project.weekly_report.each do |day|
<td><%= split_time_simple day[:seconds] %></td>
<% end %>
<td><%= split_time_simple project.weekly_report.inject(0) { |sum, n| sum + n[:seconds] } %></td>
</tr>
<% end %>
</tbody>
</table>