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我的 wagtail 网站项目分为不同的应用程序，如core、event等publications，我在core.models.

现在我想重用这个流场不仅在core.models，而且在event.models。

StreamBlock但是，只定义一次我的流场（子类化）并在我的所有应用程序中重用它的最优雅（干）方式是什么？

我StreamBlock的灵感来自wagtaildemo项目：

# core/models.py
class StoryBlock(StreamBlock):
    h2 = CharBlock(icon="title", classname="title")
    h3 = CharBlock(icon="title", classname="title")
    h4 = CharBlock(icon="title", classname="title")
    intro = RichTextBlock(icon="pilcrow")
    paragraph = RichTextBlock(icon="pilcrow")
    aligned_image = ImageBlock(label="Aligned image")
    pullquote = PullQuoteBlock()
    read_on = ReadOnBlock()

-

# event/models.py
from wagtail.wagtailcore.fields import StreamField
from wagtail.wagtailadmin.edit_handlers import FieldPanel, StreamFieldPanel
from core.models import StoryBlock

class EventIndexPage(Page):
    body = StreamField(StoryBlock())

    content_panels = Page.content_panels + [
        StreamFieldPanel('body'),
    ]

但是尝试makemigrations更新EventIndexPage页面模型会产生一个警告，我是trying to add a non-nullable field 'body' to eventindexpage without a default- 但这只会发生在非core模型上的（流）字段中。

传递请求的默认值 - 无论是它"asdf"还是"[]"- 来makemigrations构建迁移文件，但以下migrate失败：

$ python manage.py migrate
...
  File "/myproject/venv/lib/python3.5/site-packages/wagtail/wagtailcore/fields.py", line 90, in get_prep_value
    return json.dumps(self.stream_block.get_prep_value(value), cls=DjangoJSONEncoder)
  File "/myproject/venv/lib/python3.5/site-packages/wagtail/wagtailcore/blocks/stream_block.py", line 205, in get_prep_value
    for child in value  # child is a BoundBlock instance
  File "/myproject/venv/lib/python3.5/site-packages/wagtail/wagtailcore/blocks/stream_block.py", line 205, in <listcomp>
    for child in value  # child is a BoundBlock instance
AttributeError: 'str' object has no attribute 'block'

完整回溯

如果这与我的问题有关：这个项目将部署到 openshift，所以我在使用 Python 3 时仅限于 Django 1.8。很高兴使用 wagtail 1.5。

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1 回答 1

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正如gasman在他的评论中指出的那样，使用""迁移的默认值就可以了。

于 2016-06-04T09:54:56.243 回答