app/views/subjects/_modal.html.haml
.modal.fade{:role => "dialog", id: "#{dom_id(period, :subject)}"}
.modal-dialog
/ Modal content
.modal-content
= bootstrap_form_for([period, Subject.new]) do |f|
.modal-header
%button.close{"data-dismiss" => "modal", :type => "button"}
%h4.modal-title Adicionar disciplina
.modal-body
= f.text_field :name, label: 'Nome', required: true
.modal-footer
%button.btn.btn-primary{:type => "submit"} Salvar
%button.btn.btn-default{"data-dismiss" => "modal", :type => "button"} Fechar