Diango 1.6如何为具有两个外国键字段的模型创建对象

Question

有三个模型：用户，问答。

我的方式可以工作 - 跨越答案Modelform的save方法，传递两个对象（问题和用户。

我不确定这是官方方式还是最好的方法。还是在这种情况下有一些很好的教程，谢谢。

这是代码：

#settings.py
#ROOT urls.py
urlpatterns = patterns('',
    url(r'^$', 'myauth.views.home', name='home'),
    url(r'^questions/', include('questions.urls',namespace='questions')),
)
#urls.py
urlpatterns = patterns('questions.views',  
    url(r'^(?P<question_pk>d+)/detail/$',
        'detail',
        {'template_name': 'questions/detail.html'},
        name='detail'),
                       )
#models.py
class User(AbstractBaseUser):
    username = models.CharField()
class Question(models.Model):
    user = models.ForeignKey(User)  
    title = models.CharField()  
    content = models.TextField()
class Answer(models.Model):
    #user create an anwer to a question
    user = models.ForeignKey(User)  
    question = models.ForeignKey(Question)  
    content = models.TextField() 
#forms.py
class AnswerForm(ModelForm):
    class Meta:
        model = Answer
        fields = ['content']
    #this is my way
    #pass two objects:user and question to it
    def save(self,user,question,commit=True,):
        answer = super(AnswerForm,self).save(commit=False)
        answer.user = user
        answer.question = question
        if commit:
            answer.save()
        return answer
#views.py 
def detail(request,
    question_pk,
    template_name,
    answer_create_form=AnswerForm):
    """detail to show a question,contains:
    1.question's title and content.
    2.all answers(represented by field 'content')to this question
    3.a form for create an answer to this question
    """
    #question object is identified by question_pk from the url string.
    #along with request.user, both will be passed to the form to
    #create answer objects.
    question = Question.objects.get(pk=question_pk)
    user = request.user
    #all answers to this question
    answers = question.answer_set.all()
    form=None
    if user.is_authenticated():
        if request.method == 'POST':
            form = answer_create_form(data=request.POST)
            if form.is_valid():
                form.save(user=user,question=question)
                return HttpResponseRedirect(request.META.get('HTTP_REFERER', '/'))
        else:
            form = answer_create_form()
    return TemplateResponse(request, template_name, locals(),)
#questions/detail.html
#rest ommitted...
{% if form %}
<form action="" method="post">{% csrf_token %}
        {{ form.as_p }}
        <input type="submit" value="回答" />
</form>
{% endif %}

Answer 1

我认为您需要阅读此内容。因此，您应该做些类似的东西：

question = Question.objects.get(pk=question_pk)
user = request.user
(....)
if user.is_authenticated():
    if request.method == 'POST':
        answer = Answer(question=question, user=user)
        form = AnswerForm(data=request.POST, instance=answer)
        if form.is_valid():
            form.save()
        (....)