如何在表单完成期间设置外键(python/django)

Question

在表单处理期间,我希望能够在模型对象上设置外键字段,而无需用户从下拉列表中选择键.

例如:

#models.py
class AAA(models.Model):

    some_field = models.TextField()

class BBB(models.Model):
    another_field = models.TextField()
    key_field = models.ForeignKey('AAA')

用户将从显示"AAA"实例的视图导航到create_object样式视图,该视图将在给定参考"AAA"的参数的情况下创建"BBB"实例.外键在代码中设置为指向'AAA'实例.

django评论框架似乎这样做,但我无法弄清楚如何.

有任何想法吗？我相信它应该很简单.

Answer 1

您可以key_field从模型表单中排除,保存commit=False,然后key_field在保存到数据库之前在视图中设置.

class BBBForm(forms.ModelForm):
    class Meta:
        model = BBB
        exclude = ("key_field",)

def create_view(request, **kwargs):
    if request.method == "POST":
        aaa = # get aaa from url, session or somewhere else
        form = BBBForm(request.POST)
        if form.is_valid():
            bbb = form.save(commit=False)
            bbb.key_field = aaa
            bbb.save()
            return HttpResponseRedirect("/success-url/")
        ...