Wagtail > 将 gallery_images 添加到多个应用程序（页面模型实例）

Question

我按照教程做了 https://docs.wagtail.io/en/v2.6.2/getting_started/tutorial.html 并添加到我的博客应用 class BlogPageGalleryImage(Orderable): 然后 def main_image(self): 到 class BlogPage(Page): 有效。但是我还有两个应用程序（projects 和 events），其页面实例类似于 blog 并且无法添加以同样的方式向他们展示画廊。我应该将图库实现到页面 class 本身吗？

我有 4 个应用程序（博客、关于、事件、项目），分别在模型定义 *IndexPage、*Page、*PageGalleryImages 中。

例如在事件应用程序的models.py中我定义了

class EventPageGalleryImages(Orderable): 
    page = ParentalKey(EventPage, on_delete=models.CASCADE, related_name='gallery_images') 
    image = models.ForeignKey( 'wagtailimages.Image', on_delete=models.CASCADE, related_name='+' ) 
    caption = models.CharField(blank=True, max_length=250) 
    panels = [ ImageChooserPanel('image'), FieldPanel('caption'), ]

但是我通过 makemigrations 得到一个错误：

(ma_env) ➜  ma_app git:(0.15) ✗ ./manage.py runserver
Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/home/DEV/ma_env/lib/python3.6/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/home/DEV/ma_env/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run
    autoreload.raise_last_exception()
  File "/home/DEV/ma_env/lib/python3.6/site-packages/django/utils/autoreload.py", line 77, in raise_last_exception
    raise _exception[1]
  File "/home/DEV/ma_env/lib/python3.6/site-packages/django/core/management/__init__.py", line 337, in execute
    autoreload.check_errors(django.setup)()
  File "/home/DEV/ma_env/lib/python3.6/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/home/DEV/ma_env/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/DEV/ma_env/lib/python3.6/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/home/DEV/ma_env/lib/python3.6/site-packages/django/apps/config.py", line 211, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/DEV/ma_app/events/models.py", line 24, in <module>
    class EventPage(Page):
  File "/home/DEV/ma_app/events/models.py", line 53, in EventPage
    class EventPageGalleryImages(Orderable):
  File "/home/DEV/ma_app/events/models.py", line 54, in EventPageGalleryImages
    page = ParentalKey(EventPage, on_delete=models.CASCADE, related_name='gallery_images')
NameError: name 'EventPage' is not defined

Answer 1

从堆栈跟踪的最后几行来看，您似乎在 EventPage 的定义中定义了 EventPageGalleryImages:

class EventPage(Page):
    # ...

    class EventPageGalleryImages(Orderable):
        page = ParentalKey(EventPage, on_delete=models.CASCADE, related_name='gallery_images') 
        # ...

这是失败的，因为您在 ParentalKey 定义中引用了 EventPage，但 EventPage 的定义尚未完成。从第二个 class 定义中删除缩进应该可以修复它。

Wagtail > 将 gallery_images 添加到多个应用程序（页面模型实例）

Wagtail > add gallery_images to multiple apps (page model instances)

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