问在自定义(非管理) Django视图中编辑对象时未被选中的多到多字段中的值。

EN

class FirstModel(models.Model):
    title = models.CharField(max_length = 100, unique = True)

class SecondModel(models.Model):
    name = models.CharField(max_length = 100, unique = True)
    first_model = models.ManyToManyField(FirstModel)

class MyForm(forms.Form):
    name = forms.CharField(max_length = 100, required = True)
    first_model = forms.ChoiceField(widget = forms.MultipleSelect)

def edit(request):
    my_model = MyModel.objects.filter(name = 'You Unique Name').get()
    first_model = my_model.first_model.all()
    my_form = MyForm(initial = {'first_model': first_model})

# Create a form instance with POST data.
f = AuthorForm(request.POST)
# Create, but don't save the new author instance.
new_author = f.save(commit=False)
# Modify the author in some way.
new_author.some_field = 'some_value'
# Save the new instance.
new_author.save()
# Now, save the many-to-many data for the form.
f.save_m2m()