Django:在UpdateView中重写get_queryset（）

项目模式

class Project(models.Model):
    company = models.ForeignKey('projects.Company', on_delete=models.PROTECT, related_name='projects')

    title = models.CharField('Project title', max_length=128)
    start_date = models.DateField('Project start date', blank=True, null=True)
    end_date = models.DateField('Project end date', blank=True, null=True)

    estimated_design = models.DecimalField('Estimated design hours', max_digits=5, decimal_places=1,
                                           validators=[MinValueValidator(Decimal('0.01'))])
    actual_design = models.DecimalField('Actual design hours', default=0, decimal_places=1, max_digits=5,
                                        validators=[MinValueValidator(Decimal('0.01'))])

    estimated_development = models.DecimalField('Estimated development hours', max_digits=5, decimal_places=1,
                                                validators=[MinValueValidator(Decimal('0.01'))])
    actual_development = models.DecimalField('Actual development hours', default=0, decimal_places=1, max_digits=5,
                                             validators=[MinValueValidator(Decimal('0.01'))])

    estimated_testing = models.DecimalField('Estimated testing hours', max_digits=5, decimal_places=1,
                                            validators=[MinValueValidator(Decimal('0.01'))])
    actual_testing = models.DecimalField('Actual testing hours', default=0, decimal_places=1, max_digits=5,
                                         validators=[MinValueValidator(Decimal('0.01'))])

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('project-update', kwargs={'pk': self.pk, 'slug': slugify(self.title)})

    @property
    def has_ended(self):
        return self.end_date is not None and self.end_date < timezone.now().date()

    @property
    def total_estimated_hours(self):
        return self.estimated_design + self.estimated_development + self.estimated_testing

    @property
    def total_actual_hours(self):
        return self.actual_design + self.actual_development + self.actual_testing

    @property
    def is_over_budget(self):
        return self.total_actual_hours > self.total_estimated_hours

我的UpdateView类

class ProjectForm(ModelForm):

    class Meta:
        model = Project
        fields = ['actual_design', 'actual_development', 'actual_testing']

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.add_input(Submit('submit', 'UPDATE'))

class ProjectUpdateView(LoginRequiredMixin, UpdateView):
    model = Project
    form_class = ProjectForm
    success_url = reverse_lazy('dashboard')

---

目前，我的ProjectUpdateView类正在替换十进制值​​在my ProjectForm类中指示。我应该增加这些数值​​按表格上的数字填写，不得替换。据我所知，这可以通过重写ProjectUpdateView类中的get_queryset（）来实现。具体如何实现这一点？

为了增加值，您可以在

x+F（'field\u name'）

时替换值

x

，您可以通过覆盖

form\u valid

方法来实现：

from django.db.models import F

class ProjectUpdateView(LoginRequiredMixin, UpdateView):
    model = Project
    form_class = ProjectForm
    success_url = reverse_lazy('dashboard')

    def form_valid(self, form):
        form.instance.actual_design += F('actual_design')
        form.instance.actual_development += F('actual_development')
        form.instance.actual_testing += F('actual_testing')
        return super().form_valid(form)

从django.db.models导入F
类ProjectUpdateView（LoginRequiredMixin，UpdateView）：
模型=项目
form\u class=ProjectForm
success\u url=reverse\u lazy（“仪表板”）
def表单_有效（自身、表单）：
form.instance.actual_design+=F（“actual_design”）
form.instance.actual\u development+=F（“actual\u development”）
form.instance.actual_testing+=F（“actual_testing”）
return super（）.form\u有效（form）