如何使用 Django 表单编辑模型数据

Question

i'm new to django so i'm sorry for my newbie question
i have a model and i need to let user edit data inside it using django forms or any other way.

look at the image above , i want to show this form ready populated with the data and let user update it.
what is the best way to do this ?

EDIT : here is my views.py code

def exam_Edit(request,examName,number=0):
    numner = int(number)
    number = int(number)
    questionNo = int(numner)
    Myexam = models.Exam.objects.get(name = examName)



    QuestionsAll = models.Question.objects.filter(exam = Myexam)

    myQeustion = Question.objects.filter(exam = Myexam)[nextQuestion]

    answer1 =  models.Asnwers.objects.filter(question=myQeustion)[0]
    answer2 =  models.Asnwers.objects.filter(question=myQeustion)[1]
    answer3 =  models.Asnwers.objects.filter(question=myQeustion)[2]
    answer4 = models.Asnwers.objects.filter(question=myQeustion)[3]


    # HERE IS MY PROBLEM : the line below creates a form with a data but it doesn't save it to the save object     
    form = QuestionsEditForm(initial = {'questionText':myQeustion.__unicode__() , 'firstChoiceText':answer1.__unicode__(),'secondChoiceText':answer2.__unicode__(),'thirdChoiceText':answer3.__unicode__(),'forthChoiceText':answer4.__unicode__()})

    if request.method =='POST':
        #if post 

        if form.is_valid():
            questionText = form.cleaned_data['questionText']
            Myexam = Exam.objects.get(name = examName)
            myQeustion.questionText = form.cleaned_data['questionText']



            answer1.answerText = form.cleaned_data['firstChoiceText']
            answer1.save()

            answer2.answerText = form.cleaned_data['secondChoiceText']
            answer2.save()

            answer3.answerText = form.cleaned_data['thirdChoiceText']
            answer3.save()

            answer4.answerText = form.cleaned_data['forthChoiceText']
            answer4.save()

 variables = RequestContext(request,     {'form':form,'examName':examName,'questionNo':str(nextQuestion)})
 return render_to_response('exam_edit.html',variables)               

please help

Answer 1

Assuming you are using a ModelForm , use the instance keyword argument, and pass the model you are updating.

So, if you have MyModel and MyModelForm (the latter of which must extend django.forms.ModelForm ), then your code snippet might look like:

my_record = MyModel.objects.get(id=XXX)
form = MyModelForm(instance=my_record)

And then, when the user sends back data by POST:

form = MyModelForm(request.POST, instance=my_record)

Incidentally, the documentation for ModelForm is here: http://docs.djangoproject.com/en/1.8/topics/forms/modelforms/