app/views/codes/_fields.html.slim
.nested-fields.code
.wrapper
div
= f.input :id, as: :hidden, wrapper: false
= f.input :code_space_id,
as: :select,
collection: current_workgroup.code_spaces.map { |c| [c.short_name, c.id] },
label: false,
wrapper: false,
include_blank: false
div
= f.input :value, label: false, wrapper: :nested_fields
div
= link_to_remove_association '', f, class: 'fa fa-trash'