django - 视图 mysite.views.Attendancecreate 未返回 HttpResponse 对象。它返回 None 而不是

Question

我正在尝试为员工列表创建一个考勤系统，

楷模

attendance_choices = (
    ('absent', 'Absent'),
    ('present', 'Present')
)

class Head_of_department(models.Model):
    first_name = models.CharField(max_length=200)
    last_name = models.CharField(max_length=200)
    email = models.CharField(max_length=30)

    def __str__(self):
        return self.first_name 

class Employee(models.Model):
    first_name = models.CharField(max_length=200, unique=True)
    last_name = models.CharField(max_length=200, unique=True)
    head_of_department = models.ForeignKey('Head_of_department', on_delete=models.SET_NULL, blank=True, null=True)
    email = models.EmailField(max_length=100)

     def __str__(self):
        return self.first_name + ' ' + self.last_name

class Attendance(models.Model):
    head_of_department = models.ForeignKey('Head_of_department', on_delete=models.SET_NULL, blank=True, null=True)
    employee = models.ForeignKey('Employee', on_delete=models.CASCADE, )
    attendance = models.CharField(max_length=8, choices=attendance_choices, blank=True)

意见

class Attendancecreate(CreateView):
    model = Attendance
    fields = ['employee']
    success_url = '/dashboard/'

    def get_context_data(self,** kwargs):
        context = super(Attendancecreate, self).get_context_data(**kwargs)
        context['formset'] = AttendanceFormset(queryset=Attendance.objects.none(), instance=Head_of_department.objects.get(email=email), initial=[{'employee': employee} for employee inself.get_initial()['employee']])
        context['attendance_form'] = Attendanceform()
        email = self.request.user.email
        hod = Head_of_department.objects.get(email=email)
        context["employees"] = Employee.objects.filter(head_of_department =hod)
        return context

    def get_initial(self):
        email = self.request.user.email
        hod = Head_of_department.objects.get(email=email)
        initial = super(Attendancecreate , self).get_initial()
        initial['employee'] = Employee.objects.filter(head_of_department=hod)
        return initial

    def post(self, request, *args, **kwargs):
        formset = AttendanceFormset(request.POSTqueryset=Attendance.objects.none(), instance=Head_of_department.objects.get(email=email), initial=[{'employee': employee} for employee inself.get_initial()['employee']))
        if formset.is_valid():
            return self.form_valid(formset)

     def form_valid(self, formset):
        instances = formset.save(commit=False)
        for instance in instances:
            instance.head_of_department = get_object_or_404(Head_of_department, email=self.request.user.email)
            instance.save()
        return HttpResponseRedirect('/dashboard/')
     def form_invalid(self, formset):
        print ('errors')
        print (formset.errors)

形式

class Attendanceform(ModelForm):
    class Meta:
        model = Attendance
        fields = ('employee','attendance','hod')

AttendanceFormset = inlineformset_factory(Head_of_department,Attendance,fields=('attendance',))

模板

{% csrf_token %}
{{ formset.management_form }}
{% for form in formset %}
{{ form }}
<br><br>
{% endfor %}

错误

当我使用 print(formset.errors) 时，控制台中打印了下面显示的方括号

[]

我收到一个值错误

The view mysite.views.Attendancecreate didn't return an HttpResponse object. It returned None instead.

我正在尝试实现以下视图，列出员工并标记出勤，我能够列出员工，但是在标记出勤并提交后会触发上述错误。

标签： django

Answer 1

formset 无效且丢失request.POST

class Attendancecreate(CreateView):
    ...
    def post(self, request, *args, **kwargs):
        formset = AttendanceFormset(
            request.POST,
            queryset=Attendance.objects.none(), 
            instance=Head_of_department.objects.get(email=email), 
            initial=[{'employee': employee} for employee inself.get_initial()['employee'])
        )
        if formset.is_valid():
            return self.form_valid(formset)
        return self.form_invalid(formset)

    def form_invalid(self, formset):
        print (formset.errors) # Will print the error in terminal

模板

{{ formset.management_form }}
   {% for form in formset %}
      {{ form.employee.initial }} {{ form.employee}}  {{ form.attendance }}
<br><br>
   {% endfor %}