ボタンによって処理を切り替える
submit_tagの場合
view
<% form_tag -%> <%= submit_tag("Search", :name => "search") %> <%= submit_tag("Delete", :name => "delete") %> <% end -%>
controller
if params[:search] // ... elsif params[:delete] // ... end
image_submit_tagの場合
view
<% form_tag -%> <%= image_submit_tag("search.png", :name => "search") %> <%= image_submit_tag("delete.png", :name => "delete") %> <% end -%>
controller
if params['search.x'] // ... elsif params['delete.x'] // ... end