app/views/book_bags/_form.html.haml
= simple_form_for(@book_bag, html: {class: "form-horizontal"}) do |f|
= f.error_notification
= f.input :global_id, required: true, label: "Internal ID"
= f.input :classroom_id, collection: Classroom.all, value_method: :id, label_method: :name, required: true
= f.input :active?, as: :boolean
= f.button :submit, class: "btn-primary"