- execution_environments = ExecutionEnvironment.where('file_type_id IS NOT NULL').select(:file_type_id, :id)
- file_types = FileType.where('file_extension IS NOT NULL').select(:file_extension, :id)

= form_for(@exercise, data: {execution_environments: execution_environments, file_types: file_types}, multipart: true) do |f|
  = render('shared/form_errors', object: @exercise)
  .form-group
    = f.label(:title)
    = f.text_field(:title, class: 'form-control', required: true)
  .form-group
    = f.label(:description)
    = f.pagedown_editor :description
  .form-group
    = f.label(:execution_environment_id)
    = f.collection_select(:execution_environment_id, @execution_environments, :id, :name, {}, class: 'form-control')
  /.form-group
    = f.label(:instructions)
    = f.hidden_field(:instructions)
    .form-control.markdown
  .checkbox
    label
      = f.check_box(:public)
      = t('activerecord.attributes.exercise.public')
  .checkbox
    label
      = f.check_box(:hide_file_tree)
      = t('activerecord.attributes.exercise.hide_file_tree')
  .checkbox
    label
      = f.check_box(:allow_file_creation)
      = t('activerecord.attributes.exercise.allow_file_creation')
  .checkbox
    label
      = f.check_box(:allow_auto_completion)
      = t('activerecord.attributes.exercise.allow_auto_completion')
  .form-group
    = f.label(t('activerecord.attributes.exercise.difficulty'))
    = f.number_field :expected_difficulty, in: 1..10, step: 1
  .form-group
    = f.label(t('activerecord.attributes.exercise.worktime'))
    = f.number_field "expected_worktime_minutes", value: @exercise.expected_worktime_seconds / 60, in: 1..1000, step: 1

  h2 = t('exercises.form.tags')
  ul.list-unstyled.panel-group
    li.panel.panel-default
      .panel-heading role="tab" id="heading"
        a.file-heading data-toggle="collapse" href="#tag-collapse"
          div.clearfix role="button"
            span = t('exercises.form.click_to_collapse')
      .panel-collapse.collapse id="tag-collapse" role="tabpanel"
        .table-responsive
          table.table#tags-table
            thead
              tr
                th = t('activerecord.attributes.exercise.selection')
                th = sort_link(@search, :title, t('activerecord.attributes.tag.name'))
                th = t('activerecord.attributes.tag.difficulty')
              = collection_check_boxes :exercise, :tag_ids, @exercise_tags, :tag_id, :id do |b|
                tr
                  td = b.check_box
                  td = b.object.tag.name
                  td = number_field "tag_factors[#{b.object.tag.id}]", :factor, :value => b.object.factor, in: 1..10, step: 1

  h2 = t('activerecord.attributes.exercise.files')
  ul#files.list-unstyled.panel-group
    = f.fields_for :files do |files_form|
      = render('file_form', f: files_form)

  a#add-file.btn.btn-default.btn-sm.pull-right href='#' = t('.add_file')
  ul#dummies.hidden = f.fields_for(:files, CodeOcean::File.new, child_index: 'index') do |files_form|
    = render('file_form', f: files_form)

  .actions = render('shared/submit_button', f: f, object: @exercise)