基于类的视图CreateView给Form添加初值

知识点：

1. 直接在视图中使用get_form_kwargs函数，然后再函数内通过initial给表单传递初值。
2. 通过get_success_url函数使用reverse_lazy带参数跳转的方法，跳转到其他页面

表单

class WorksForm(forms.ModelForm):
    category = forms.ModelChoiceField(queryset=Category.objects.all(), required=False, label='作品分类', widget=forms.Select(attrs={'class': 'form-control'}))
    phase = forms.ModelChoiceField(queryset=Phase.objects.all(), required=False, label='团购期数', widget=forms.Select(attrs={'class': 'form-control'}))
    status = forms.ChoiceField(choices=Works.Status, label='状态', widget=forms.Select(attrs={'class': 'form-control'}))

    class Meta:
        model = Works
        fields = '__all__'

视图

@method_decorator(login_required, name='dispatch')
class WorksCreate(CreateView):
    """
    新增作品，链接加上参数：{% url 'casual:works_create' %}?phase_id={{ phase_id }}
    """
    model = Works
    template_name = 'works-edit.html'
    form_class = WorksForm

    def get_form_kwargs(self):
        kwargs = super(WorksCreate, self).get_form_kwargs()
        phase_id = self.request.GET.get('phase_id')
        if phase_id:
            phase = Phase.objects.get(id=phase_id)
            print(kwargs)  # 进入网页，该字段值：{'initial': {}, 'prefix': None, 'instance': None}
            kwargs.update(
                {'initial': {'phase': phase}}  # 给表单的phase字段传递外键实例
            )
        return kwargs

    def get_success_url(self):
        phase_id = self.request.GET.get('phase_id')
        # print(phase_id)
        if phase_id:
            return reverse_lazy('casual:works_list_by_phase', kwargs={'phase_id': phase_id})  # reverse_lazy带参数跳转，键值对
        else:
            return reverse('casual:works_list')

    def get_context_data(self, **kwargs):
        context = super(WorksCreate, self).get_context_data(**kwargs)
        return context