在django中测试从数据库获取选择的表单-不允许数据库访问

我的表单有一个测试出错了,因为我的表单选项是从模型中填充的。错误如下:

../myapp/tests/test_forms.py:5: in <module>
    from myapp.forms import AssignmentForm, AssignmentFormSet
myapp/forms.py:135: in <module>
    class MyDetailForm(forms.ModelForm):
myapp/forms.py:138: in MyDetailForm
    choices=[(ey.end_year, ey.full_label()) for ey in Year.objects.all()]
venv/lib/python3.7/site-packages/django/db/models/query.py:268: in __iter__
    self._fetch_all()
venv/lib/python3.7/site-packages/django/db/models/query.py:1186: in _fetch_all
    self._result_cache = list(self._iterable_class(self))
venv/lib/python3.7/site-packages/django/db/models/query.py:54: in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
venv/lib/python3.7/site-packages/django/db/models/sql/compiler.py:1063: in execute_sql
    cursor = self.connection.cursor()
venv/lib/python3.7/site-packages/django/db/backends/base/base.py:255: in cursor
    return self._cursor()
venv/lib/python3.7/site-packages/django/db/backends/base/base.py:232: in _cursor
    self.ensure_connection()
E   Failed: Database access not allowed, use the "django_db" mark, or the "db" or "transactional_db" fixtures to enable it.

看来我不喜欢 Year 对象供我在中选择 MyDetailForm 看起来是这样的:

class MyDetailForm(forms.ModelForm):

    end_year = forms.ChoiceField(
        choices=[(ey.end_year, ey.full_label()) for ey in Year.objects.all()]
    )

    class Meta:
        model = MyDetail
        fields = ["end_year", "is_current"]
        labels = {"is_current": "Current Sections"}

这是个大禁忌吗?我怎样才能绕过这个问题,这样我的测试才能真正运行?

这个错误会在我的测试运行之前弹出,所以它会在我的导入语句中发生。

如果我改变 [(ey.end_year, ey.full_label()) for ey in Year.objects.all()] 到 [] 我的测试按预期运行,但我不想在 forms.py 只是为了测试…