带有变量“必填”字段的Django表单

Question

我有一个多租户应用程序，其中每个“租户”（公司模型对象）都有多个客户端。每个租户可以设置其应用所需的必填字段。

class Client(models.Model):
    """
    Client information
    """
    company = models.ForeignKey(Company, blank=True, null=True, default=1, on_delete=models.SET_NULL)
    name = models.CharField(max_length=150, blank=True)
    email = models.EmailField(max_length=255, unique=True)
    phone_number = models.CharField(max_length=50, blank=True, null=True)

class RequiredClientFields(models.Model):
    """
    Let each business decide how to enforce the data filling requirements for its staff/clients.
    0 - dont even show it
    1 - show it, but dont require (default)
    2 - require field for either staff or client
    3 - require for clients when self-filling their form, but not the staff members
    """
    company = models.ForeignKey(Company, db_index=True, on_delete=models.CASCADE)
    field_name = models.CharField(max_length=50)
    status = models.PositiveSmallIntegerField(choices=FIELD_STATUS_CHOICES, default=1)

因此，在创建要在模板上使用的django表单时，根据公司的政策，显示（验证）每个字段的最佳方法是什么？

感谢

Answer 1

类似这样的方法可能会起作用。

声明一个ModelForm并用删除字段或更改其__init__()状态的逻辑覆盖required：

class ClientForm(forms.ModelForm):
    class Meta:
        model = Client
        fields = '__all__'

    def __init__(self, company, user, *args, **kwargs):
        super(ClientForm, self).__init__(*args, **kwargs)
        # For each RequiredClientFields instance, 
        # get the matching form field and make changes
        for rule in RequiredClientFields.objects.filter(company=company):
            # get the form field
            field = self.fields.get(rule.field_name, None)
            if field:
                if rule.status == 0:
                    # remove field from form
                    self.fields.pop(rule.field_name)
                elif rule.status == 2:
                    # require field
                    field.required = True
                elif rule.status == 3 and not user.is_staff:
                    # require for clients when self-filling their form, 
                    # but not the staff members
                    field.required = True

然后在您的视图中创建ModelForm的实例，为公司和用户传递参数。

company = Company.objects.get(pk=1)
client_form = ClientForm(company=company, user=request.user)

请注意，以这种方式控制表单字段时可能存在安全隐患。看看Django ModelForm文档中的relevant section。