Question

I have an action that renders a view which contains this:

<select id ='dynamic_select'>
  <option value = "<%= activity_path %>">All</option>
  <option value = "<%= activity_path(:type => 'enrolled') %>">Enrolled</option>
  <option value = "<%= activity_path(:type => 'redeem') %>">Redeem</option>
  <option value = "<%= activity_path(:type => 'social') %>">Social</option>
</select>

What would be the correct/Rails way of rendering that select and mark as selected one of the options depending on the type parameter:
If there is no type parameter, select “All” options, if there is type=enrolled parameter select Enrolled option, and so on…

I have managed to do that client side with Javascript, but I am wondering what would be the Rails way of doing so.

Rendered HTML:

<select id="dynamic_select" name="dynamic_select">
<option value="/activity">All</option>
<option value="/activity?type=enrolled">Enrolled</option>
<option value="/activity?type=redeem">Redeem</option>
<option value="/activity?type=social">Social</option>
</select>

Answer 1

Something like the following. I have displayed the select_options here, but you should probably generate them in your controller and pass them through to the view.

The key is using options_for_select.

<% select_options = {"All" => activity_path} %>
<% %w{Enrolled Redeem Social}.each {|opt| select_options[opt] = activity_path(:type => opt.downcase)} %>
<% form_for(resource) do |f| %>
  <%= s.select :dynamic, options_for_select(select_option, :selected => select_options[@default || "All"]) %>
<% end %>