Filtro
<%= form_for :search, :url => "/atividades", :html => {:method => :get, :class => "form"} do |f| %>
<%= f.label :created_at_s, "Data Inicial" %>
<%= f.text_field :created_at_s, :class => "datepicker" %>
<%= f.label :created_at_e, "Data Final" %>
<%= f.text_field :created_at_e, :class => "datepicker" %>
<%= f.label :owner_id, "Usuário" %>
<%= f.select :owner_id, options_from_collection_for_select(User.all, :id, :name), {:include_blank => true} %>
<%= f.submit "Filtrar", :class => "btn btn-primary" %>
<% end %>