how to build a select tag from a range in rails

I want to have a drop down that consists of values 10% 20% 30% so on till 100.

In ruby It can be done by

(10..100).step(10) { |i| p i }

how can 开发者_StackOverflow中文版i convert this into a select tag?

I tried:

<%=p.select :thc, options_for_select((10..100).step(10) {|s| ["#{s}%", s]})%>

but this is printing 10 11 12 13....100

You almost had it:

<%=p.select :thc, options_for_select((10..100).step(10).to_a.map{|s| ["#{s}%", s]})%>

#step returns an enumerator (or yields, as you've shown). It looks like what you want is to call #collect on this enumerator.

<%=p.select :thc, options_for_select((10..100).step(10).collect {|s| ["#{s}%", s]})%>

<%= select("sale", "discount", (10..100).step(10).collect {|p| [ "#{p}%", p ] }, { :include_blank => true }) %>

Without Providing a Formatted Value.

If you landed here, like me, without the need to use step() or to provide a formatted value (e.g. "20%"), this is a nice and succinct method:

<%= f.select :year, (2011..Date.today.year).to_a %>

<select id="report_year" name="report[year]">
  <option value="2011">2011</option>
  <option value="2012">2012</option>
  <option value="2013">2013</option>
  <option value="2014">2014</option>
  <option value="2015">2015</option>
</select>

With a Default

<%= f.select :year, options_for_select( (2011..Date.today.year).to_a, Date.today.year ) %>

<select id="report_year" name="report[year]">
  <option value="2011">2011</option>
  <option value="2012">2012</option>
  <option value="2013">2013</option>
  <option value="2014">2014</option>
  <option value="2015" selected="selected">2015</option>
</select>