过滤 django admin inline - 限制选择列表

Question

鉴于我的内联管理员：

class TestInlineAdmin(admin.TabularInline):
    model = Test.questions.through
    extra = 0  

然后

class QuestionAdmin(admin.ModelAdmin):
    inlines = [TestInlineAdmin, ]

Test 模型具有 question 字段，即 ManyToMany。而且我通常可以直接从测试模型编辑问题列表。 但我希望能够从 QuestionAdmin 内的内联管理员中选择测试（因此，反过来）。 这行得通。但我需要过滤此内联中的 Test 对象，因此选择列表只会显示 Test.objects.filter(applicable=False)。

我尝试使用 get_queryset，但这似乎对选择列表没有影响，它只是过滤内联中实际引用的项目，但新项目的选择列表总是向我显示完整的未过滤查询集用于测试模型。

覆盖 formfield_for_manytomany 在内联中不起作用 - 它根本不执行。 用formfield_overrides有可能吗？ 或者，我认为唯一的方法是自定义内联表单？

-编辑-

定义多对多的我的模型：

class Test(models.Model):
    title = models.CharField(max_length=80)
    description = models.TextField(null=True)
    position = models.ForeignKey('repository.Position', on_delete=models.CASCADE, null=True)
    questions = models.ManyToManyField('questions.Question')
    applicable = models.BooleanField(default=False)

-- 已编辑-- 威廉提议后的追溯

2021-09-03 07:50:37 | ERROR | /usr/local/lib64/python3.6/site-packages/django/utils/log.py | log_response | - Internal Server Error: /admin/questions/question/45/change/
Traceback (most recent call last):
  File "/usr/local/lib64/python3.6/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/usr/local/lib64/python3.6/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 614, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/sites.py", line 233, in inner
    return view(request, *args, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 1656, in change_view
    return self.changeform_view(request, object_id, form_url, extra_context)
  File "/usr/local/lib64/python3.6/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 1534, in changeform_view
    return self._changeform_view(request, object_id, form_url, extra_context)
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 1598, in _changeform_view
    formsets, inline_instances = self._create_formsets(request, obj, change=True)
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 1954, in _create_formsets
    for FormSet, inline in self.get_formsets_with_inlines(*get_formsets_args):
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 798, in get_formsets_with_inlines
    yield inline.get_formset(request, obj), inline
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 2053, in get_formset
    fields = flatten_fieldsets(self.get_fieldsets(request, obj))
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 335, in get_fieldsets
    return [(None, {'fields': self.get_fields(request, obj)})]
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 326, in get_fields
    form = self._get_form_for_get_fields(request, obj)
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 2138, in _get_form_for_get_fields
    return self.get_formset(request, obj, fields=None).form
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 2135, in get_formset
    return inlineformset_factory(self.parent_model, self.model, **defaults)
  File "/usr/local/lib64/python3.6/site-packages/django/forms/models.py", line 1082, in inlineformset_factory
    FormSet = modelformset_factory(model, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/django/forms/models.py", line 879, in modelformset_factory
    error_messages=error_messages, field_classes=field_classes)
  File "/usr/local/lib64/python3.6/site-packages/django/forms/models.py", line 555, in modelform_factory
    return type(form)(class_name, (form,), form_class_attrs)
  File "/usr/local/lib64/python3.6/site-packages/django/forms/models.py", line 258, in __new__
    apply_limit_choices_to=False,
  File "/usr/local/lib64/python3.6/site-packages/django/forms/models.py", line 179, in fields_for_model
    formfield = formfield_callback(f, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/django/contrib/admin/options.py", line 172, in formfield_for_dbfield
    formfield.widget, db_field.remote_field, self.admin_site, **wrapper_kwargs
AttributeError: 'dict' object has no attribute 'widget'

Answer 1

您可以将QuerySet 的QuerySet 限制为：

class TestInlineAdmin(admin.TabularInline):
    model = Test.questions.through
    extra = 0
    
    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == 'test':
            kwargs['queryset'] = Test.objects.filter(applicable=False)
        return super().formfield_for_foreignkey(db_field, request, **kwargs)