如何在django模型的字段中保存单个空间(“”)?

My model definition looks like this:

我的模型定义如下:

class MyModel(models.Model):
    tag_separator = models.CharField(max_length=1, null=True, blank=True)

The tag_separator is a single character, and it can be a single space: " ".
I need to select null=True in order to get it to work, but when I POST data through my REST API, it saves the tag_separator as an empty string: "tag_separator": "".

tag_separator是单个字符，它可以是单个空格:“”。我需要选择null=True来让它工作，但是当我通过REST API发布数据时，它将tag_separator保存为空字符串:“tag_separator”:“”。

Is there a simple way to stop Django from assuming that my single space string is an empty string?

有什么简单的方法可以阻止Django假设我的单个空间字符串是空字符串吗?

I am using: Django==1.11 and djangorestframework==3.7.7

我使用的是:Django= 1.11, djangorestframework= 3.7.7

2 个解决方案

#1

I solved it like this:

我这样解它:

class NonStrippingCharField(models.CharField):
    def formfield(self, **kwargs):
        kwargs['strip'] = False
        return super(NonStrippingCharField, self).formfield(**kwargs)

Then in my model:

然后在我的模型:

class MyModel(models.Model):
    tag_separator = NonStrippingCharField(max_length=1, null=True, blank=True)

#2

On your Serializer, pass in trim_whitespace=False into your CharField. ie:

在序列化器上，将trim_whitespace=False传递到CharField。即:

class MyModelSerializer(serializers.ModelSerializer):
    tag_separator = serializers.CharField(trim_whitespace=False)

    class Meta:
        model = MyModel

Similarly, when you use django's forms, use strip=False:

同样，在使用django的表单时，使用strip=False:

class MyModelForm(forms.ModelForm):
    tag_separator = forms.CharField(strip=False)

    class Meta:
        model = MyModel

#1