ProgrammingError:列"X"的类型为double precision,但表达式的类型为numeric []

Question

ProgrammingError:列"X"的类型为double precision,但表达式的类型为numeric []

Nac*_*yes 8 python postgresql precision psycopg2 django-rest-framework

我正在尝试使用Django Rest Framework和Psycopg2库编写API.此API适用于PostgreSQL数据库.我需要在此数据库中存储2个浮点数组字段,因为API使用2个传感器将数据流式传输到Android应用程序,它们以两个数组存储在APP中,并由JSON发送到API REST.

这些是我的models.py,serializers.py和views_api.py:

Models.py

class DataTest(models.Model):
  patient = models.ForeignKey(Patient)
  label = models.CharField(max_length=36)
  angle_data = ArrayField(models.FloatField())
  emg_data = ArrayField(models.FloatField())
  created_at = models.DateTimeField(auto_now_add=True)
  modified_at = models.DateTimeField(auto_now=True)

  def __unicode__(self):
    return self.patient

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Serializers.py

class DataTestSerializer(serializers.Serializer):
  pk = serializers.IntegerField(read_only=True)
  label = serializers.CharField()
  angle_data = serializers.ListField(child=serializers.FloatField())
  emg_data = serializers.ListField(child=serializers.FloatField())
  patient = serializers.PrimaryKeyRelatedField(queryset=Patient.objects.all())

  def create(self, validated_data):
    return DataTest.objects.create(**validated_data)

  def update(self, instance, validated_data):
    instance.label = validated_data.get('label', instance.label)
    instance.angle_data = validated_data.get('angle_data', instance.angle_data)
    instance.emg_data = validated_data.get('emg_data', instance.emg_data)
    instance.patient = validated_data.get('patient', instance.patient)
    instance.save()
    return instance

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api.py

class DataTestList(APIView):

  def get(self, request, format=None):
    dataTests = DataTest.objects.all()
    serializer = DataTestSerializer(dataTests, many=True)
    return Response(serializer.data)

  def post(self, request, format=None):
    serializer = DataTestSerializer(data=request.data)
    if serializer.is_valid():
       serializer.save()
       return Response(serializer.data, status=status.HTTP_201_CREATED)
    return Response(serializer.error_messages,
status=status.HTTP_400_BAD_REQUEST)

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最后,我测试了API并发送了一个JSON示例:{"label":"Test","angle_data":[1.434,2.243,3.234],"emg_data":[2.3,2.1],"patient": 1}

我收到以下错误:

ProgrammingError:列"angle_data"的类型为double precision,但表达式的类型为numeric [] LINE 1:...,"created_at","modified_at")VALUES(1,'Test',ARRAY [1.0,... ^]

提示:您需要重写或转换表达式.

我已经调试了API,我看到序列化程序收到一个浮点列表.我想问题是PostgreSQL中的列是双精度而浮点列表没有用双精度编写.

有人能帮助我吗？

问候,谢谢!!