python - 多选 Django 复选框表单验证

Question

我有一个带有 favourite_trees 字段的表单，我希望它的 3 个选项显示为复选框。然后我希望用户能够选中 0 到 3 个复选框，并保存这些结果。但是，当我尝试保存表单时，favourite_trees 字段仅保存为空列表。其他字段保存正确。我该如何修复它以便选中的复选框能够保存？

表单.py

class TreesForm(forms.models.ModelForm):
    favourite_trees = forms.MultipleChoiceField(choices=TreePreference.TREE_CHOICES,
        widget=forms.CheckboxSelectMultiple())
    class Meta:
        model = TreePreference
        fields = (
                'tree_knowledge',
                'tree_type',)
        widgets = {
            'tree_type': forms.HiddenInput(),
        }

模型.py

class TreePreference(models.Model):
    TREE_CHOICES = ('red_trees',
                    'blue_trees',
                    'purple_trees',
                   )
    tree_knowledge = model.CharField(blank=True, max_length=10)
    tree_type = model.CharField(blank=True, max_length=20)
    favourite_trees = models.CharField(choices=TREE_CHOICES, max_length=50, blank=True)

Answer 1

还有一个包 django-multiselectfield 可以帮助您存储不需要单独模型的多个(字符串)值。