如何从另一个表django rest框架中获取相关数据

Question

我有三种模式的农药、疾病和指示，我想要的是获得与杀虫剂相关的所有，这与指令模型有关。

class Disease(models.Model):
    name = models.CharField(max_length=100)
    def __str__(self):
        return self.name

class Pesticide(models.Model):
    name = models.CharField(max_length=50)
    def __str__(self):
        return self.name


class Treatment(models.Model):
    disease = models.ForeignKey(Disease, related_name='treatments', on_delete=models.DO_NOTHING)
    pesticide = models.ForeignKey(Pesticide, related_name='treatments', on_delete=models.DO_NOTHING)

    def __str__(self):
        return self.instruction

串行化

class PesticideSerializer(serializers.ModelSerializer):
   
    class Meta:
        model = Pesticide
        fields = ('id', 'name')

class DiseaseSerializer(serializers.ModelSerializer):
    pesticides = PesticideSerializer(source='treatment_set', read_only=True)
    class Meta:
        model = Disease
        fields = [

            'id',
            'name',
            'pesticides',
           
        ]

我的问题是我无法在django序列化器中获得杀虫剂

Answer 1

我认为将DiseaseSerializer中的行DiseaseSerializer更改为pesticides = PesticideSerializer(source='treatment_set', read_only=True, many=True)将解决问题(您应该添加many=True，因为关系类型是一对多的)。