Question

我有与使用ForeignKey的项目相关的SectionInfo模型，以及与与OneToOneField的SectionInfo相关的Section2模型。如何在Projects Serializer中访问Section2数据透明度。

models.py

class Projects(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL,
                             on_delete=models.CASCADE)
    p_name = models.CharField(max_length=100)
    p_name_full = models.CharField(max_length=150)
    p_creation_date = models.DateTimeField(auto_now=False, auto_now_add=False, null=True, blank=True)

class SectionInfo(models.Model):
    p_id = models.ForeignKey(Projects, 
        on_delete=models.CASCADE, related_name='sec_info', db_column='p_id')
    s_name = models.CharField(max_length=200)
    s_type = models.CharField(max_length=200, db_column='type')
    s_length = models.IntegerField(null=True, blank=True)

class Section2(models.Model):
    info_id = models.OneToOneField('rsa.SectionInfo', 
        on_delete=models.CASCADE, related_name='sec_2', db_column='info_id')
    s_cbRestrictionEnd_1 = models.IntegerField(null=True, blank=True)
    s_cbReflector_1 = models.IntegerField(null=True, blank=True)

serializer.py

class ProjectListSerializer(ModelSerializer):
    sec_2 = Section2Serializer(many=True)

    class Meta:
        depth = 2
        model = Projects
        fields = [
            'p_name',
            'p_name_full',
            'p_creation_date',
            'sec_2',
        ]

class Section2Serializer(ModelSerializer):
    sec_info = SectionInfoSerializer(read_only=True)

    class Meta:
        depth = 2
        model = Section2
        fields = [
            'sec_info',
            'sec_ques',
            's_cbRestrictionEnd_1',
            's_cbReflector_1',
       ]

class SectionInfoSerializer(ModelSerializer):
        class Meta:
            model = SectionInfo
            fields = [
            's_name',
            's_type',
            's_length',
           ]

这将显示以下错误：

尝试在序列化程序sec_2上获取字段ProjectListSerializer的值时出现AttributeError。序列化程序字段的名称可能不正确，并且与Projects实例上的任何属性或键都不匹配。原始异常文本为：'Projects'对象没有属性'sec_2'。

Answer 1

Projects类和Section2并不直接相关。删除“ sec_2”并在项目序列化程序中包含“ sec_info”，然后使用

sec_2 = Section2Serializer(many=True)
fields = [...., 'sec_2']

在SectionInfoSerializer中。

多重嵌套序列化器

1 个答案: