从Django的模型中获取信息的正确方法？

Question

我想获得选择了value1的人的电子邮件列表。这是我的代码：

views.py

if form.is_valid():
            email = form.cleaned_data['email']
            option = request.POST.getlist('my_field')
            new_user = form.save(email, option)
            list = Vartotojas.objects.filter(option=u"Value1").values_list("email", flat=True) 
# Here I am trying to get list of emails, who chose Value 1

forms.py

email = forms.EmailField(max_length=100)
my_field = forms.MultipleChoiceField(choices=(('Value1','Value1'),('Value2','Value2')), widget=forms.CheckboxSelectMultiple())

    def save(self, email, option):
        mymodel = Vartotojas(
        email=email,
        option = option,
        )
        mymodel.save()

models.py

option = models.CharField(max_length=30)

然而，在我收到空列表的电子邮件列表中。我的错误在哪里？