Table with list of fields - ruby-on-rails

Question

I'm trying to put together a table with seven columns for a schedule. On each column I want to list twenty fields. I playing around but I cannot find the way to make it work.
Controller:
def new
#doctor = Doctor.new
140.times { #doctor.schedules.build }
end
Model:
has_many :schedules
def schedule_attributes=(schedule_attributes)
schedule_attributes.each do |attributes|
schedules.build(attributes)
end
end
Form:
<tr>
<% #doctor.schedules.each_with_index do |schedule, i| %>
<td>
<% if i > 0 && i % 20 == 0 %>
</td>
<td>
<% end %>
<%= fields_for "doctor[schedule_attributes][]", schedule do |schedule_form| %>
<ul>
<% schedule_form.text_field :day, value: #days[0] %>
<li><%= schedule_form.check_box :hour, value: "8:00" %></li>
</ul>
<% end %>
</td>
<% end %>
</tr>
This only outputs forty fields. The idea is output 140 fields, twenty in each column.
I would like to insert the twenty fields in one single cell. Can somebody point me on the right direction?

Answer 1

Using a simple (quick and dirty) approach, you can do this:
<tr>
<td>
<% #doctor.schedules.limit(140).each_with_index do |schedule, i| %>
<% if i > 0 && i % 20 == 0 %>
</td>
<td>
<% end %>
<%= fields_for "doctor[schedule_attributes][]", schedule do |schedule_form| %>
<ul>
<% schedule_form.text_field :day, value: #days[0] %>
<li><%= schedule_form.check_box :hour, value: "8:00" %></li>
</ul>
<% end %>
<% end %>
</td>
</tr>
If you want to reuse this logic, a helper method should be used:
def to_columns(collection, num_columns)
html = ""
count = collection.size
num_rows = (count / num_columns.to_f).ceil
collection.each_with_index do |item, i|
html << '<td>'.html_safe if (i % num_rows == 0)
html << yield(item, i)
html << '</td>'.html_safe if (i % num_rows == 0 || i == (count - 1))
end
html
end
And in your view, let this method make your <td> tags as needed:
<tr>
<%= to_columns(#doctor.schedules.limit(140), 7) do |schedule, i| %>
<%= fields_for "doctor[schedule_attributes][]", schedule do |schedule_form| %>
<ul>
<% schedule_form.text_field :day, value: #days[0] %>
<li><%= schedule_form.check_box :hour, value: "8:00" %></li>
</ul>
<% end %>
<% end %>
</tr>