Django“此字段为必填。”在邮递员

Question

serializers.py

类CardSerializer（serializers.ModelSerializer）：

image = serializers.CharField(read_only=True) 
class Meta:
    model = Card
    fields = ('id', 'template', 'data', 'MD5', 'image_md5',
              'image', 'target_url', 'title', 'description',
              'created', 'updated', 'createdBy')
    read_only_fields = ['MD5', 'image_md5', 'image', 'createdBy']

def create(self, validated_data):
    user = self.context.get('request').user
    if not user.id:
        raise ValidationError("Login Required")
    validated_data['createdBy'] = user
    return super(CardSerializer, self).create(validated_data)

def update(self, instance, validated_data):
    new_ins = Card(**validated_data)
    md5 = new_ins.gen_md5()
    lookup = Card.objects.filter(MD5=md5).first()
    if lookup:
        return lookup

    return super(CardSerializer, self).update(instance, validated_data)

邮递员

enter image description here