Question

鉴于以下模型：

class Graph(models.Model):
    owner = models.ForeignKey(User)

    def __unicode__(self):
        return u'%d' % self.id

class Point(models.Model):
    graph = models.ForeignKey(Graph) 
    date  = models.DateField(primary_key = True)
    abs   = models.FloatField(null = True)
    avg   = models.FloatField(null = True)

    def __unicode__(self):
        return u'%s' % self.date

我正在尝试创建一个用于编辑Points列表的表单。 HTML输入标记需要设置其他属性，因此我使用以下自定义表单：

class PointForm(forms.ModelForm):
    graph = forms.ModelChoiceField(queryset = Graph.objects.all(),
                                   widget   = forms.HiddenInput())
    date  = forms.DateField(widget = forms.HiddenInput(), label = 'date')
    abs   = forms.FloatField(widget = forms.TextInput(
                                      attrs = {'class': 'abs-field'}),
                            required = False)

    class Meta:
        model  = Point
        fields = ('graph', 'date', 'abs')  # Other fields are not edited.

    def pretty_date(self):
        return self.data.strftime('%B')

此时我不知道如何将Point类的实例传递给FormSet：

def edit(request):
    PointFormSet = forms.formsets.formset_factory(PointForm, extra = 0)
    if request.method == 'POST':
        return

    # Receive 3 points to edit from the database.
    graph, res = Graph.objects.get_or_create(id = 1)
    one_day    = datetime.timedelta(days = 1)
    today      = datetime.date.today()
    do_edit    = []
    for date in [today - (x * one_day) for x in range(3)]:
        point, res = Point.objects.get_or_create(graph = graph, date = date)
        do_edit.append(point)

    formset = PointFormSet(????) # How is this initialized with the points?

我发现了一个有点工作的黑客，但是在以后尝试处理生成的POST数据时会导致错误：

do_edit = []
for date in [today - (x * one_day) for x in range(3)]:
    point, res    = Point.objects.get_or_create(graph = graph, date = date)
    data          = point.__dict__.copy()
    data['graph'] = graph
    do_edit.append(data)

formset = PointFormSet(initial = do_edit)

这是如何正确完成的？

作为参考，我的模板如下所示：

<form action="" method="post">
{{ formset.management_form }}
<table>
    <tbody>
    {% for form in formset.forms %}
        <tr>
            <td>{{ form.graph }} {{ form.date }} {{ form.pretty_date }}:</td>
            <td width="100%">{{ form.abs }}</td>
        </tr>
    {% endfor %}
    </tbody>
</table>
</form>

Answer 1

诀窍是使用“ModelFormset”而不仅仅是一个formset，因为它们允许使用queryset进行初始化。文档是here，您在创建模板formset时提供form = *，在实例化formset时提供queryset = *。 form = * arguement没有很好地记录（必须在代码中稍微挖掘一下以确保它实际存在）。

def edit(request):
    PointFormSet = modelformset_factory(Point, form = PointForm)
    qset = Point.objects.all() #or however your getting your Points to modify
    formset = PointFormset(queryset = qset)
    if request.method == 'POST':
        #deal with posting the data
        formset = PointFormset(request.POST)
        if formset.is_valid():
            #if it is not valid then the "errors" will fall through and be returned
            formset.save()
        return #to your redirect

    context_dict = {'formset':formset,
                    #other context info
                    }

    return render_to_response('your_template.html', context_dict)

因此代码很容易通过。如果请求是GET，则将实例化的表单返回给用户。如果请求是POST并且表单为not .is_valid()，则错误“通过”并在同一模板中返回。如果请求是POST并且数据有效，则保存表单集。

希望有所帮助。

- 将会

Answer 2

如果您只想设置一个可能的值，或者可能是关闭的值，则可以在用户使用commit=False将数据发送到服务器后设置它们

请考虑以下代码：

class UserReferralView(View):
    ReferralFormSet = modelformset_factory(ReferralCode,
                                           form=ReferralTokenForm, extra=1)

    def get(self, request):
        pass

    def post(self, request):
        referral_formset = UserUpdateView.ReferralFormSet(request.POST)

        if referral_formset.is_valid():
            instances = referral_formset.save(commit=False)
            for instance in instances:
                instance.user = request.user
                instance.save()
            return redirect(reverse('referrals.success_view'))
         else:
            return redirect(reverse('referrals.failure_view'))

Django：使用实例初始化自定义表单的FormSet

2 个答案: