Django MultpleSelectionField用法和錯誤

Question

我有以下代碼

models.py

fitness_choices = (('wl', 'Weight Loss'), ('ft', 'Firming and Toning'),
                   ('yo', 'Yoga'), ('ot', 'Others'), )
periods_to_train = (('da', 'Daily'), ('ft', 'Few Times A Week'),
                    ('oa', 'Once A Week'), )

class Fitness(models.Model):
    fitness_goals = models.CharField(max_length=80, choices=fitness_choices)
    training_periods = models.CharField(max_length=5, choices=periods_to_train)

表格

class FitnessForm(ModelForm):
    fitness_goals = forms.MultipleChoiceField(
            choices=fitness_choices, widget=forms.CheckboxSelectMultiple)
    training_periods = forms.MultipleChoiceField(
            choices=DAYS_OF_WEEK, widget=forms.CheckboxSelectMultiple)

    class Meta:
          model = Fitness

views.py

from apps.services.forms import FitnessForm

def fitness(request):
    """ Creating a Fitness RFQ """
    fitness_rfq_form = FitnessForm()
    if request.method == 'POST':
        fitness_rfq_form = FitnessForm(request.POST)
        if fitness_rfq_form.is_valid():
            obj = fitness_rfq_form.save(commit=False)
            obj.user = request.user
            obj.save()
            return HttpResponseRedirect(reverse('home'))
    context = {'fitness_rfq_form': fitness_rfq_form}
    return render(request, 'services/fitness_rfq.html', context)

但是當我嘗試提交時，出現以下驗證錯誤

Select a valid choice. [u'wl', u'ft'] is not one of the available choices.

Select a valid choice. [u'0', u'1'] is not one of the available choices.

那么，即使我們在ModelForm中將其稱為MultiplechoiceField，為什么也顯示上述驗證錯誤呢？

Answer 1

您不應該在模型字段中指定choices ...這是驗證失敗的部分。

您的表格運行良好，並且“多項選擇”字段的結果當然是所選選項的列表。 但是隨后您的模型字段期望從choices一個單一值。

如果要將選定選項的列表存儲在CharField中，則需要首先將它們轉換為字符串，也許可以通過json.dumps