app/views/backend/weekly_sessions/_form.html.erb
<%= simple_form_for [:backend, resource] do |f| %>
<%= f.input :numero_de_sesion %>
<%= f.input :numero_de_periodo %>
<%= f.input :numero_de_reunion %>
<%= f.input :session_type_id, label: "tipo de session", collection: SessionType.all, input_html: { class: 'select2' } %>
<%= f.button :submit, 'Crear Sesion', :class => 'btn-primary' %>
<% end %>