覆盖指定字段的空值显示在django Admin中不起作用
我写了一个模型如下：覆盖指定字段的空值显示在django Admin中不起作用,django,python-3.x,django-models,django-admin,Django,Python 3.x,Django Models,Django Admin,我写了一个模型如下： from django.db import models class Author(models.Model): name = models.CharField(max_length=100) title = models.CharField(max_length=3) birth_date = models.DateField(blank=True, null=True) from django.contrib import admin cl
from django.db import models
class Author(models.Model):
name = models.CharField(max_length=100)
title = models.CharField(max_length=3)
birth_date = models.DateField(blank=True, null=True)
from django.contrib import admin
class AuthorAdmin(admin.ModelAdmin):
fields = ('name', 'title', 'view_birth_date')
def view_birth_date(self, obj):
return obj.birth_date
view_birth_date.empty_value_display = '-empty-'
from django.db import models
class Author(models.Model):
name = models.CharField(max_length=100)
title = models.CharField(max_length=3)
birth_date = models.DateField(blank=True, null=True)
from django.contrib import admin
class AuthorAdmin(admin.ModelAdmin):
fields = ('name', 'title', 'view_birth_date')
def view_birth_date(self, obj):
return obj.birth_date
view_birth_date.empty_value_display = '-empty-'
Traceback (most recent call last):
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\contrib\admin\options.py", line 703, in get_form
return modelform_factory(self.model, **defaults)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\forms\models.py", line 551, in modelform_factory
return type(form)(class_name, (form,), form_class_attrs)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\forms\models.py", line 266, in __new__
raise FieldError(message)
django.core.exceptions.FieldError: Unknown field(s) (view_birth_date) specified for Author
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\core\handlers\base.py", line 126, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\core\handlers\base.py", line 124, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\contrib\admin\options.py", line 604, in wrapper
return self.admin_site.admin_view(view)(*args, **kwargs)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\utils\decorators.py", line 142, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\views\decorators\cache.py", line 44, in _wrapped_view_func
response = view_func(request, *args, **kwargs)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\contrib\admin\sites.py", line 223, in inner
return view(request, *args, **kwargs)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\contrib\admin\options.py", line 1639, in change_view
return self.changeform_view(request, object_id, form_url, extra_context)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\utils\decorators.py", line 45, in _wrapper
return bound_method(*args, **kwargs)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\utils\decorators.py", line 142, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\contrib\admin\options.py", line 1525, in changeform_view
return self._changeform_view(request, object_id, form_url, extra_context)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\contrib\admin\options.py", line 1554, in _changeform_view
ModelForm = self.get_form(request, obj, change=not add)
File "C:\Users\monikat\Envs\django_training\lib\site-packages\django\contrib\admin\options.py", line 707, in get_form % (e, self.__class__.__name__)
django.core.exceptions.FieldError: Unknown field(s) (view_birth_date) specified for Author. Check fields/fieldsets/exclude attributes of class AuthorAdmin.
有人知道为什么会出现此错误吗？问题是您在模型管理类的字段属性中定义了查看出生日期 因为它不存在于您的db模型中，所以它给出了错误。此类自定义字段将用于列表显示，在列表显示中，您可以像上面所做的那样从方法中获取值，请参阅 现在，如果您希望在添加/更改页面上显示一些自定义字段，则必须创建一个自定义表单，并在其中定义自定义字段。 如果自定义字段仅用于表示，则可以将其定义为只读，如下所示：
class AuthorAdmin(admin.ModelAdmin):
fields = ('name', 'title', 'view_birth_date')
readonly_fields = ['view_birth_date']
def view_birth_date(self, obj):
return obj.title
view_birth_date.empty_value_display = '-empty-'
希望有帮助 我遵循django官方文档（*上面已经给出了链接），因为他们没有创建“查看出生日期”字段，他们只是创建了方法
def view\u birth\u date（self，obj）：返回obj.birth\u date