如何使 Wagtail Streamfield 不再需要？

Question

在下面的模型中，我想让bottom_content整个字段不再是必需的。我怎样才能做到这一点？

class ServicePage(Page):
  top_content = StreamField(default_blocks + [
    ('two_columns', TwoColumnBlock()),
    ('three_columns', ThreeColumnBlock()),
  ])
  bottom_content = StreamField(default_blocks + [
    ('two_columns', TwoColumnBlock()),
    ('three_columns', ThreeColumnBlock()),
  ])

  search_fields = Page.search_fields + [
    index.SearchField('top_content'),
    index.SearchField('bottom_content'),
  ]

  content_panels = Page.content_panels + [
    StreamFieldPanel('top_content'),
    StreamFieldPanel('bottom_content'),
    InlinePanel('service_package', label='Packages')
  ]

Answer 1

StreamField还接受可选关键字参数blank，默认为false；当此值为 false 时，必须至少提供一个块才能使该字段被视为有效。

来自： - http://docs.wagtail.io/en/latest/topics/streamfield.html