Django通用CreateView和UpdateView中的Modelformset

Wedava 发表于 Dev

韦达瓦

我有一个具有两个字段“ id”和“ name”的组织模型。我打算使用动态模型表单集填充它。到目前为止，我的代码如下。

形式

class OrganizationForm(forms.ModelForm):
    class Meta:
        model = Organization
        fields = ('name',)

OrganizationFormset = modelformset_factory(Organization, form=OrganizationForm, fields=('name', ), extra=1)

意见

class OrganizationCreate(CreateView):
    model = Organization
    form_class = OrganizationForm

    def get_context_data(self, **kwargs):
        context = super(OrganizationCreate, self).get_context_data(**kwargs)
        context['formset'] = OrganizationFormset()
        return context

    def post(self, request, *args, **kwargs):
        formset = OrganizationFormset(request.POST)
        if formset.is_valid():
            return self.form_valid(formset)

    def form_valid(self, formset):
        formset.save()
        return HttpResponseRedirect('/')

    def form_invalid(self, formset):
        return self.render_to_response(self.get_context_data(formset=formset))


class OrganizationUpdate(UpdateView):
    model = Organization
    form_class = OrganizationForm
    template_name_suffix = '_update_form'

    def get_context_data(self, **kwargs):
        context = super(OrganizationUpdate, self).get_context_data(**kwargs)
        context['formset'] = OrganizationFormset()
        return context

    def post(self, request, *args, **kwargs):
        formset = OrganizationFormset(request.POST)
        if formset.is_valid():
            return self.form_valid(formset)

    def form_valid(self, formset):
        formset.save()
        return HttpResponseRedirect('/')

    def form_invalid(self, formset):
        return self.render_to_response(self.get_context_data(formset=formset))

模板创建

<form id="myForm" method="post" action="">
            {% csrf_token %}
            {% for hidden in form.hidden_fields %} {{ hidden }} {% endfor %}
           {{ form }}
           <table border="0" cellpadding="0" cellspacing="0">
               <tbody>
                   {% for form in formset.forms %}
                   {% for hidden in form.hidden_fields %} {{ hidden }} {% endfor %}
                   <tr>
                      <td>
                         {% if form.instance.pk %}{{ form.DELETE }}{% endif %}

                         {{ form.field1 }}
                      </td>
                      <td>{{ form.name }}</td>
                   </tr>
                   {% endfor %}
               </tbody>
           </table>
           {{ formset.management_form }}
            <input type="submit" value="Create Location">
       </form>

更新

<form id="myForm" method="post" action="">
            {% csrf_token %}

           <table border="0" cellpadding="0" cellspacing="0">
               <tbody>
                   {% for form in formset.forms %}
                   {% for hidden in form.hidden_fields %} {{ hidden }} {% endfor %}
                   <tr>
                      <td>
                         {% if form.instance.pk %}{{ form.DELETE }}{% endif %}

                         {{ form.field1 }}
                      </td>
                      <td>{{ form.name }}</td>
                   </tr>
                   {% endfor %}
               </tbody>
           </table>
           {{ formset.management_form }}
            <input type="submit" value="Update organizations">
       </form>

但是，创建模板和更新模板都显示先前存在的组织，而这仅应在更新模板中发生。此外，删除更新页面中的现有组织将返回以下错误：

The view aims.views.OrganizationUpdate didn't return an HttpResponse object. It returned None instead.

django通用视图和表单集是我的新手。我做错了什么？

提前致谢。

无脑的编码员

默认情况下django model formsets将显示它可以从数据库中找到的所有项目。因此queryset，在创建参数时，必须重写该参数，以使其知道要使用的项目以及何时使用。例如，您应提供-

Organization.objects.none()

对于这样的创建视图-

class OrganizationCreate(CreateView):
    ...

    def get_context_data(self, **kwargs):
        ...
        context['formset'] = OrganizationFormset(queryset=Organization.objects.none()) # providing none

    def post(self, request, *args, **kwargs):
        ...

    def form_valid(self, formset):
        ...

    def form_invalid(self, formset):
        ...

这将迫使表单集呈现空白表单。同样，在更新视图中进行更改以编辑特定项目-

class OrganizationUpdate(UpdateView):
    ...

    def get_context_data(self, **kwargs):
        context = super(OrganizationUpdate, self).get_context_data(**kwargs)
        context['formset'] = OrganizationFormset(queryset=Organization.objects.get(pk=< get the pk from url when editing>))
        return context

    def post(self, request, *args, **kwargs):
        ...

    def form_valid(self, formset):
        ...

    def form_invalid(self, formset):
        ...

希望这可以解决您的问题。如果您仍然发现问题，请使用网址的详细信息和可能的屏幕截图更新问题。我会看到我能做什么。

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。