Question

我有两个模型，一个在动态选择字段中加载另一个模型的标题。到目前为止我修复了它，如果我通过更新init方法中的选项列表向模型中添加一个新对象来使用标题，则选择列表会立即更新。但是，当我决定选择它作为选项并保存时，我得到：选择一个有效的选择。示例不是可用选项之一。当我重新启动服务器它确实有效，我做了什么：

模型：

class Assessment(models.Model):
    title = models.CharField(max_length=200)

    SPECIFIC_REQUIREMENTS_CHOICES = ()
    SPECIFIC_REQUIREMENTS_CHOICES_LIST = []

    for sRequirement in SpecificRequirements.objects.all():
        SPECIFIC_REQUIREMENTS_CHOICES_LIST.append((sRequirement.title, sRequirement.title))

    SPECIFIC_REQUIREMENTS_CHOICES = SPECIFIC_REQUIREMENTS_CHOICES_LIST

    sRequirementChoice = models.CharField(max_length=200, choices=SPECIFIC_REQUIREMENTS_CHOICES,
                                default='')

形式：

class AssessmentForm(forms.ModelForm):
    class Meta:
        model = Assessment
        fields = ['title', 'sRequirementChoice']

    def __init__(self, *args, **kwargs):
        super(AssessmentForm, self).__init__(*args, **kwargs)
        SPECIFIC_REQUIREMENTS_CHOICES_LIST = []

        for sRequirement in SpecificRequirements.objects.all():
            SPECIFIC_REQUIREMENTS_CHOICES_LIST.append((sRequirement.title, sRequirement.title))

        SPECIFIC_REQUIREMENTS_CHOICES = SPECIFIC_REQUIREMENTS_CHOICES_LIST

        self.fields['sRequirementChoice'].choices = SPECIFIC_REQUIREMENTS_CHOICES

Answer 1

That's not how Model choices work. You are not supposed to populate choices dynamically in models.

You should consider using a ForeignKey relation with SpecificRequirements in your model.

Django字段选择没有正确更新

1 个答案: