django 中的 Modelformset 泛型 CreateView 和 UpdateView

Question

我有一个包含两个字段 'id' 和 'name' 的模型组织。我打算使用动态模型 formsets.The 代码来填充它，目前我的代码如下。

表格

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

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

观看次数

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会显示预先存在的组织，而这应该只发生在更新模板中。而且，删除更新页面中已有的组织returns出现如下错误：

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

我是 django 通用视图和使用表单集的新手。我做错了什么？

提前致谢。

Answer 1

当 formset 在两个基于 Class 的视图（创建和更新）中无效时，您的 post 方法 return 什么都没有，您应该 return form_invalid在 else 分支中：

if formset.is_valid():
    return self.form_valid(formset)
else:
    return self.form_invalid(formset)

Answer 2

默认情况下 django model formsets 将显示它可以从数据库中找到的任何项目。所以你必须在创建一个时覆盖 queryset 参数，让它知道要使用哪些项目以及何时使用。例如，您应该提供 -

Organization.objects.none()

像这样创建视图 -

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):
        ...

这将强制表单集呈现空白表单。同样更改更新视图以编辑特定项目 -

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):
        ...

希望这能解决您的问题。如果您仍然看到问题，请使用网址的详细信息和可能的屏幕截图更新问题。我会看看我能做什么。

django 中的 Modelformset 泛型 CreateView 和 UpdateView

Modelformset in django generic CreateView and UpdateView

python

django

modelform

formset