app/views/calendars/calendar_events/_form.html.erb
<%= simple_form_for([calendar, calendar_event], html: { class: 'calendar_event_form'}) do |f| %>
<%= render 'shared/errors', subject: calendar_event, subject_name: 'event' %>
<div class="form-group">
<%= f.label :calendar_event_type_id, t('calendars.calendar_events.form.event_type') %>
<%= f.select :calendar_event_type_id, options_from_collection_for_select(calendar.valid_calendar_event_types, 'id', 'display_title', calendar_event.calendar_event_type.nil? ? 1 : calendar_event.calendar_event_type.id),{}, { class: 'form-control' } %>
</div>
<div class="form-group row">
<div class="col">
<div class="form-group">
<%= f.input :start_date, as: :tempus_dominus_date, default_date: Time.zone.today, label: t('calendars.current_events.start_date') %>
</div>
</div>
<div class="col">
<div class="form-group">
<%= f.input :end_date, as: :tempus_dominus_date, default_date: Time.zone.today, label: t('calendars.current_events.end_date') %>
</div>
</div>
</div>
<%= f.submit class: 'btn btn-primary' %>
<%= link_to t('common.labels.back'), :back, class: 'btn btn-secondary' %>
<% end %>