looping over columns in rails - sql

Question

This is probably very easy, but I'm having a hard time figuring it out.
I have a partial:
<% for room in #scrape %>
<tr id="page_<%= room.id %>">
<th scope="row" class="<%= cycle("spec", "specalt") -%>"><%=h room.name %></td>
<td class="<%=current_cycle%>"><%=h room.day1 %></td>
<td class="<%=current_cycle%>"><%=h room.day2 %></td>
<td class="<%=current_cycle%>"><%=h room.day3 %></td>
<td class="<%=current_cycle%>"><%=h room.day4 %></td>
<td class="<%=current_cycle%>"><%=h room.day5 %></td>
<td class="<%=current_cycle%>"><%=h room.day6 %></td>
<td class="<%=current_cycle%>"><%=h room.day7 %></td>
<td class="<%=current_cycle%>"><%= select_tag("room[#{room.id}]", options_for_select(0..room.spots,0)) %></td>
</tr>
<% end %>
From a find_by_sql result like so:
ID Room Day1 Day2 Day3 Day4 Day5 Day6 Day7
18298 Blue Room 13.23 13.23 13.23 13.23 13.23 13.23 13.23
But I don't know how many days there will be, how can I loop thru the column results for the different Days?

Answer 1

This could be done in a helper using block/yield, but that's outside the scope of your question. I'll get right to the question by doing this inside the partial.
<% room.attributes.each do |key, value| %>
<% if key.to_s.include?("day") %>
<td class="<%=current_cycle%>"><%=h value.to_s %></td>
<% end %>
<% end %>
Update:
Here is the helper example. If this pattern is showing up more than once in your app, I think this is both more maintainable and readable.
def attributes_for(model, match, &block)
model.attributes.each do |key, value|
if key.to_s.include?(match)
# we pass key and value in this example. but you can
# pass whatever you want to the block.
concat(capture(key, value, &block))
end
end
end
And this is now your partial:
<% attributes_for(room, "day") do |key, value| %>
<td class="<%=current_cycle%>"><%=h value.to_s %></td>
<% end %>
More total lines of code, but better if you are going to be doing this throughout your app.