python - 我如何继承 Django CreateView

Question

我有一个模型，我想为它传递一些参数给表单。模型是:

class CandidateNote(models.Model):
    candidate   = models.ForeignKey(CandProfile, on_delete=models.CASCADE, related_name='candidatenotes_cand')
    note_by     = models.ForeignKey(BaseUser, null=True, on_delete=models.SET_NULL, related_name='candidatenotes_user')
    job_note    = models.TextField(max_length=3000)
    date_added  = models.DateTimeField(auto_now_add=True)

如您所见，该模型有 2 个外键(candidate 和 note_by)

在表单上，​​我将只显示字段“job_note”'candidate' 和 'note_by' 字段将由 View 填充

class CreateNoteView(CreateView):

    template_name = 'candidates/create_note.html' 
    form_class = CreateNoteForm    
    success_url = reverse_lazy('staff_main')

我被告知可以使用通用CreateView，但我必须“子类”'get_form()' 方法和以下内容:

form = CreateNoteForm(...); 
form.instance.candidate = self.object; 
form.instance.note_by = self.request.user; 
form.save()

我查看了 CreateView 类中默认的“get_form()”方法，它有:

def get_form(self, form_class=None):
    """Return an instance of the form to be used in this view."""
    if form_class is None:
        form_class = self.get_form_class()
    return form_class(**self.get_form_kwargs())

我究竟如何“子类”并添加

    form = CreateNoteForm(...);  
    form.instance.candidate = self.object; 
    form.instance.note_by = self.request.user; 
    form.save()

到“get_form”方法，我在...的部分放了什么:

form = CreateNoteForm(...);

在我看来，此时我真的应该 form.save() 吗？

Answer 1

您只需在通用 View 的 get_form 方法上调用 super 命令，如下所示:

class CreateNoteView(CreateView):
    ...
    def get_form(self, form_class=None):
        # Python 2.7-style super command:
        form = super(CreateNoteView, self).get_form(form_class)

        # If using Python 3, you would do this instead:
        # form = super().get_form(form_class)

        # begin the code that you wish to tack on:
        form.instance.candidate = self.object; 
        form.instance.note_by = self.request.user; 
        form.save()

        # Return the form variable, just like the parent class's get_form method:
        return form