如何将参数传递给QueryDicts，并将其连续传递给django表单以便在其中使用

Question

描述:我正在使用表单来为那些通过使用ModelForm类成功地完成确定的练习的用户填写Completed_Exercise模型实例，但是由于Completed_ExerciseForm有三个字段，其中两个字段对应于ForeignKey字段，所以我不需要在模板上呈现它们，而是用分数1(非常搞笑的用户可以进行自我限定)，所以我决定通过一个request.GET副本将这两个字段作为参数传递给ModelForm实例。

我在谷歌上搜索了一个小时，尝试并修正了一些东西.但即使如此，我也犯了同样的错误，据我所知，这同样可以通过把它们传递给形体，但这不是我想要的方式。任何帮助都是非常感谢的。

结果：i无法从表单内部访问QueryDict

模型：

class Completed_Exercise(models.Model):

    possible_scores = list(zip(range(1,8), range(1,8)))
    exercise = models.OneToOneField(Exercise, default=None, on_delete=models.CASCADE)
    points = models.IntegerField(default=0, choices=possible_scores)
    student = models.ForeignKey('accounts.Student', on_delete = models.CASCADE, related_name='completed_exercises')
    
    def __str__(self):
        return self.name

#Student belongs to other django app, despite its placed alongside the first one. 
class Student(models.Model):
    user = models.OneToOneField(User, null=True, on_delete=models.CASCADE, related_name="student")
    pui = models.CharField(max_length=20, blank=True, default='')
    grade = models.CharField(max_length=1, blank=True, default='')
    score = models.IntegerField(default=0)
    reputation = models.IntegerField(default=0)

    def __str__(self):
        return self.user.username

视图：

def exercise_detail_view(request,pk):
    
    form = Completed_ExerciseForm()
    exercise = get_object_or_404(Exercise, pk=pk)

    if request.method == "GET":
        if request.user.is_authenticated:
            copy = request.GET.copy()
            
            copy['student'] = request.user.student
            copy['exercise'] = get_object_or_404(Exercise, pk=pk)
            form = Completed_ExerciseForm(copy)
            print(copy)
            print('you are registered...glad am i')
        else:
            return redirect('login')

        if request.user.student.completed_exercises.filter(pk=pk).exists():
            messages.add_message(request, messages.ERROR, 'You are done with that exercise already')
            print('exercise_completed!!!')
            return redirect('exercise/' + str(pk))

        elif form.is_valid():

            form.save()
            print('saved the holy form')
            return redirect(request.META['HTTP-REFERER'])
   
    
    context = { 'exercise':exercise, 'form':form }
    return render(request, 'training/exercise.html',context=context)

表格：

class Completed_ExerciseForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        self.qQ = args[0]
        super().__init__(*args, **kwargs)

    def save(self, *args, **kwargs):
        Completed_Exercise.objects.create(student = self.qQ['student'], exercise = self.qQ['exercise'], points = self.points)

    class Meta:
        model = Completed_Exercise
        fields = ['points']

这就是我所犯的错误

我想这已经足够回答了，如果不是这样的话，请告诉我。

Answer 1

使用ModelForm，您可以提供initial关键字参数，该参数是要加载表单的键和值的字段名的切分。我也不会像那样覆盖save()。

所以在你的例子中，用这些值来定义那些FK字段，你会做一些类似的事情；

class Completed_ExerciseForm(forms.ModelForm):
    
    class Meta:
        model = Completed_Exercise
        fields = [
            'points',
            'student',
            'exercise'
        ]
        widgets = {
            'student': forms.HiddenInput(),
            'exercise': forms.HiddenInput(),
        }

def exercise_detail_view(request,pk):
    
    form = Completed_ExerciseForm()
    exercise = get_object_or_404(Exercise, pk=pk)

    if request.method == "GET":
        if request.user.is_authenticated:
            initial = {}
            initial['student'] = request.user.student
            initial['exercise'] = get_object_or_404(Exercise, pk=pk)
            form = Completed_ExerciseForm(initial=initial)
            print(initial)
            print('you are registered...glad am i')
        else:
            return redirect('login')