問題描述
過濾從 Wagtail 核心頁面導入的多個模型的自定義字段 (Filter on custom field across multiple models that import from Wagtail core Page)
我有兩個自定義 Page 模型共享一個共同的字段，例如：
class CustomPageModelOne(Page):
custom_field = models.IntegerField()
...
class CustomPageModelTwo(Page):
custom_field = models.IntegerField()
...
理想情況下，我需要跨兩種自定義類型運行單個過濾器頁面模型。Wagtail 文檔說我可以使用 exact_type 方法來指定從核心 Page 繼承的多個模型，所以我正在嘗試以下一些變體：
Page.objects.exact_type(CustomPageModelOne, CustomPageModelTwo).filter(custom_field=123)
但是，當我嘗試過濾使用這兩種模型的任何 QuerySet 時，我收到一個錯誤：
django.core.exceptions.FieldError: Cannot resolve keyword 'custom_field' into field。
如何跨多個共享一個字段的 Wagtail 自定義頁面模型進行查詢？
注意：
參考解法
方法 1:
As you do Page.objects... you can only filter on fields of the Page model and subclasses of Page
To filter specifically on fields of your CustomPageModelOne, you would have to use CustomPageModel.objects... where that model has that field and both your custom page models are subclasses from
方法 2:
Apparently Page.objects.exact_type is only returning a queryset based upon Page, which makes sense because exact_type has no way of knowing what fields would occur on models descended from Page. I would suggest the following as an alternative approach if re‑architecting your models is not an option:
from itertools import chain
model_one_results = CustomPageModelOne.objects.filter(custom_field=123)
model_two_results = CustomPageModelTwo.objects.filter(custom_field=123)
all_results = list(chain(model_one_results, model_two_results))
(by Brylie Christopher Oxley、Vincent、Dan Swain)