Djano反向关系序列化

2024-04-29 • 问答

我有很多对很多关系，我想序列化反向关系。这是我的模特：

class Nutrition(models.Model):
  name = models.CharField(max_length=30,blank=False)

  def __str__(self):
    return self.name

class Company(models.Model):
   name = models.CharField(max_length=30,blank=False)
   nutritions = models.ManyToManyField(Nutrition,blank=True,related_name="companyID")

   def __str__(self):
     return self.name

这是我的序列化器：

class NutritionSerializer(serializers.ModelSerializer):
  companyID = CompanySerializer(read_only=True,many=True)

  class Meta:
    model = Nutrition
    fields=('id','name','companyID')

class CompanySerializer(serializers.ModelSerializer):
  nutritions_list = NutritionSerializer(source="nutritions",read_only=True,many=True)

  class Meta:
    model = Company
    fields = ('id','nutritions_list')

我得到一个错误：

NameError: name 'CompanySerializer' is not defined

由于致电CompanySerializer，您收到名称错误：

class NutritionSerializer(serializers.ModelSerializer):
    companyID = CompanySerializer(read_only=True,many=True)
    ...

在定义它之前（下面几行）：

class CompanySerializer(serializers.ModelSerializer):
    ...

我建议做的是为Company添加另一个不包含NutritionSerializer的串行器，因此您可以将其放在NutritionSerializer和CompanySerializer的上方。这是它的外观：

class SimpleCompanySerializer(serializers.ModelSerializer):
    class Meta:
        model = Company
        fields = ('id','name')

class NutritionSerializer(serializers.ModelSerializer):
    company = SimpleCompanySerializer(read_only=True,many=True)

    class Meta:
        model = Nutrition
        fields=('id','name','company')

class CompanySerializer(serializers.ModelSerializer):
    nutritions_list = NutritionSerializer(source="nutritions",read_only=True,many=True)

    class Meta:
        model = Company
        fields = ('id','nutritions_list')

Djano反向关系序列化

thickice_1119 回答：Djano反向关系序列化

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