我的鹡鸰网站项目被拆分为不同的应用程序,如core
、event
、publications
等,我在core.models
中设置了我的流场。
现在我想不仅在core.models
中重用这个流域,而且在event.models
中重用这个流域。
我的流域(子类化StreamBlock
)一次并在我的所有应用程序中重用它的最优雅(干)方法是什么?
我的StreamBlock
灵感来自鹡鸰演示项目的灵感:
# 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
更新的EventIndexPage
页面模型会产生一个警告,表明我正在trying to add a non-nullable field 'body' to eventindexpage without a default
- 但这只发生在非core
模型上的(流)字段上。
传递请求的默认值(无论是"asdf"
还是"[]"
)以makemigrations
生成迁移文件,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:这个项目将被部署到openshift,所以我在使用Python 3时仅限于Django 1.8。很高兴使用鹡鸰 1.5。
gasman在他的评论中指出的那样,使用""
作为迁移的默认值就可以了。