Reporte de compras y egresos por mes

<%= form_tag(purchases_per_month_path, method: :get, remote: true) do |f| %>
Localización
<%= select_tag "location", grouped_options_for_select([ ['Puntos de venta', Pointsale.activos.collect { |p| [ p.name, ('P-' + p.id.to_s) ] }], ['Almacenes', Warehouse.activos.collect { |w| [ w.name, ('W-' + w.id.to_s)] }], ["", ["Todos"]]], selected: "Todos"), class: "pointsale_id form-control select2" %>
Del
<%= text_field_tag "start_date", l(Date.today.beginning_of_month, format: '%d/%m/%Y'), class: "form-control" %>
Al
<%= text_field_tag "end_date", l(Date.today.end_of_month, format: '%d/%m/%Y'), class: "form-control" %>
<%= submit_tag 'Filtrar', { class: "btn green bold btn-block", style: 'margin:0px' } %>
<% end %>
Compras y egresos