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| 冬酒暖阳 | mailto:1067764354@qq.com | 博客:www.lifepoem.cn |

正文

在使用 Django-Rest-Framework 的 HyperlinkedIdentityField 来生成字段的反向链接时,如果数据库中字段的值为空,此时 DRF 就会返回一串错误信息:

django.core.exceptions.ImproperlyConfigured: Could not resolve URL for hyperlinked relationship using view name "user-detail". You may have failed to include the related model in your API, or incorrectly configured the `lookup_field` attribute on this field.

解决方案:

  1. 重写 HyperlinkedIdentityField 类的 to_representation 方法,从而规避数据库值为空的情况

    注:

    1. value 是一个数据库记录的对象
    2. 需要将 user修改为数据库中希望反向生成链接的字段名
    # 重写 HyperlinkedIdentityField 类的 to_representation 方法,从而规避数据库值为空的情况
    class MyHyperlinkedIdentityField(serializers.HyperlinkedIdentityField):
        def to_representation(self, value):
            if not value.user:
                return None
            return super().to_representation(value)
    
  2. 将序列化器中,对应字段的字段序列化类型修改为自己重写的子类 MyHyperlinkedIdentityField

    class ScoreSerializer(serializers.ModelSerializer):
        uploadUser_href = MyHyperlinkedIdentityField(
            view_name='user-detail',
            lookup_field='User_id',
            lookup_url_kwarg='userID')