Filter form with simple_form base on filterable by Justin Weiss ( http://goo.gl/xr10rK )

_search_form

<%= simple_form_for :user, :method => 'get', :url => users_path, :html => {:class => ''} do |f| %>
  <div class="form-group form-group-sm col-xs-12 col-sm-4 col-md-4 col-lg-3">
    <%= f.input :username_like, input_html: { name: 'username_like', :value => params[:username_like] }, label: t('fields.user.username'), :required => false %>
    <%= f.input :is_active_check, input_html: { name: 'is_active_check' }, label: t('fields.user.is_active'), as: :select, checked_value: true, unchecked_value: false, :required => false, :selected => params[:is_active_check], :include_blank => '' %>
    <%= f.input :acl_id_ref_check, collection: Acl.all, input_html: { name: 'acl_id_ref_check' }, as: :select, label_method: :description, label: t('fields.user.acl_id'), value_method: :id, :selected => params[:acl_id_ref_check], :include_blank => '', :required => false %>
    <%= f.input :locale, :as => :hidden, :input_html => {:name => 'locale', :value => params[:locale] } %>
    <%= f.button :submit, t('search'), class: "btn-success btn-sm" %>
  </div>
<% end %>