Agenda calendar/roster view - ruby-on-rails

Question

I would like to display an agenda that shows who is available for roster for the next seven days, with the following logic:
Looping through each of the 7 days, for each day:
If the leave starts today, show Starts %H:%M
If the leave finishes today, show Finishes %H:%M
If the leave starts and finishes today, show %H:%M - %H:%M
If the leave doesn't start or finish today but spans over today, show all day
Should include leave that start or finish outside of the 7 days but span the 7 days being displayed.
I am hoping for someone to point me in the right direction preferably using Rails and Postgres. I am not against doing the queries for each day since at most there will only be 30 days displayed, but also looking for reasonably performant code since there could be 100+ leave records per day.
First example that does not fulfill the criteria outlined above.
<% #dates.each do |d| %>
<h5><%= d.strftime("%A %d %b") %></h5>
<% #leave = Leave.where('(start_at BETWEEN ? AND ?) OR (end_at BETWEEN ? AND ?)', d.beginning_of_day, d.end_of_day, d.beginning_of_day, d.end_of_day) %>
<% #leave = #leave.where.not('end_at < ?', Time.current) %>
<% if #leave.any? %>
<ul>
<% #leave.each do |leave| %>
<% if leave.single_day? && leave.start_at.to_date == d %>
<li>
<label class="label label-danger"><%= leave.start_at.strftime('%H:%M') %> - <%= leave.end_at.strftime('%H:%M') %></label>
<%= leave.user.name %>
</li>
<% elsif !leave.single_day? %>
<% if leave.start_at.to_date == d %>
<li>
<label class="label label-danger">From <%= leave.start_at.strftime('%H:%M') %></label>
<%= leave.user.name %>
</li>
<% elsif leave.end_at.to_date == d %>
<li>
<label class="label label-danger">Until <%= leave.end_at.strftime('%H:%M') %></label>
<%= leave.user.name %>
</li>
<% else %>
<li>
<label class="label label-danger">All Day</label>
<%= leave.user.name %>
</li>
<% end %>
<% end %>
<% end %>
</ul>
<br/>
<span class="label label-success" style="margin-right: 10px;">
<span class="glyphicon glyphicon-ok"></span>
</span>
<%= current_account.users.active.where.not(id: #leave.map(&:user_id)).count %> Available
<% else %>
<span class="label label-success" style="margin-right: 10px;">
<span class="glyphicon glyphicon-ok"></span>
</span>
<%= current_account.users.active.count %> Available
<% end %>
<br />
<br />
<% end %>

Answer 1

I would start with something like this:
In the model:
def starts_on?(date)
start_at.to_date == date
end
def ends_on?(date)
end_at.to_date = date
end
def covers?(date)
leave.start_at.to_date <= date && leave.end_at.to_date >= date
end
def starts_and_ends_on?(date)
starts_on?(date) && ends_on?(date)
end
In the controller:
#dates = # define the date range like you already do, I assume it is an array
#leaves = Leave.includes(:user).
where('start_at =< ? AND end_at >= ?', dates.max, dates.min)
In the helper:
def relevant_leaves_for_date(date, leaves)
leaves.select { |leave| leave.covers?(date) }
end
def leave_description_for_date(leave, date)
if leave.starts_and_ends_on?(date)
"#{leave.start_at.strftime('%H:%M')} - #{leave.end_at.strftime('%H:%M')}"
elsif leave.starts_on?(date)
"From #{leave.start_at.strftime('%H:%M')}"
elsif leave.ends_on?(date)
"Until #{leave.end_at.strftime('%H:%M')}"
else
'All day'
end
end
def available_users(leaves)
current_account.users.active.count - leaves.size
end
In the view:
<% #dates.each do |date| %>
<h5><%= date.strftime("%A %d %b") %></h5>
<% leaves = relevant_leaves_for_date(date, #leaves) %>
<% if leaves.any? %>
<ul>
<% leaves.each do |leave| %>
<li>
<label class="label label-danger">
<%= leave_description_for_date(leave, date) %>
</label>
<%= leave.user.name %>
</li>
<% end %>
</ul>
<% end %>
<span class="label label-success">
<span class="glyphicon glyphicon-ok"></span>
</span>
<%= available_users(leaves) %> Available
<% end %>
You might notice that I remove the <br> and style tags from the html. Please do not use <br> for styling or style attributes in the html. Add class the the tags and style them in your css file.

Answer 2

The reason why case 4 & 5 are not working is you are not fetching the leaves which started before the beginning of day or which are going to end after the end of day. So you can fetch all leaves which have not ended yet.
<% #leave = Leave.where('(end_at >= ?', d.beginning_of_day) %>
And then in application_helper.rb, you can have a function like this,
def check_for_leave(leave,d)
msg = ""
if leave.single_day? && leave.start_at.to_date == d
msg = "#{leave.start_at.strftime('%H:%M')} - #{leave.end_at.strftime('%H:%M')}"
elsif !leave.single_day?
if leave.start_at.to_date == d
msg = "From #{leave.start_at.strftime('%H:%M')}"
elsif leave.end_at.to_date == d
msg = "Until #{leave.end_at.strftime('%H:%M')}"
else
msg = "All Day"
end
return msg
end
In html.erb file
<% #dates.each do |d| %>
<h5><%= d.strftime("%A %d %b") %></h5>
<% #leave = Leave.where('(end_at >= ?', d.beginning_of_day) %>
<% if #leave.any? %>
<ul>
<% #leave.each do |leave| %>
<li>
<label class="label label-danger">
<%= check_for_leave(leave, d) %>
</label>
<%= leave.user.name %>
</li>
<% end %>
</ul>
<br/>
<span class="label label-success" style="margin-right: 10px;">
<span class="glyphicon glyphicon-ok"></span>
</span>
<%= current_account.users.active.where.not(id: #leave.map(&:user_id)).count %> Available
<% else %>
<span class="label label-success" style="margin-right: 10px;">
<span class="glyphicon glyphicon-ok"></span>
</span>
<%= current_account.users.active.count %> Available
<% end %>
<br />
<br />
<% end %>