我想在反序列化期间将空字符串默认为 0 或 null。
杰伦
{
'injuries': '6',
'children': '2',
'civilians': '',
}
但是,我不断收到此错误:
"有效的整数是必需的。">
models.py
from django.db import models
class Strike(models.Model):
location = models.ForeignKey('Location', on_delete=models.CASCADE)
civilians = models.PositiveIntegerField(blank=True, null=True)
injuries = models.PositiveIntegerField(blank=True, null=True)
children = models.PositiveIntegerField(blank=True, null=True)
serializers.py
from rest_framework import serializers
from .models import Strike
class StrikeSerializer(serializers.ModelSerializer):
civilians = serializers.IntegerField(default=0, required=False)
class Meta:
model = Strike
fields = '__all__'
def create(self, validated_data):
return Strike.objects.create(**validated_data)
主要
serializer = StrikeSerializer(data=strike)
我尝试在创建方法中操作数据,但在此之前引发了错误。我可以在 DRF 结构中的哪个位置覆盖它,特别是将 '' 转换为 0 或 None?
可以使用
CharField
,然后在验证方法中转换为int
。
class StrikeSerializer(serializers.ModelSerializer):
civilians = serializers.CharField(
required=False, allow_null=True, allow_blank=True)
def validate_civilians(self, value):
if not value:
return 0
try:
return int(value)
except ValueError:
raise serializers.ValidationError('You must supply an integer')
您可以使用to_internal_value方法在验证数据之前截获数据。
class StrikeSerializer(serializers.ModelSerializer):
civilians = serializers.IntegerField(default=0, required=False)
class Meta:
model = Strike
fields = '__all__'
def to_internal_value(self, data):
if data.get('civilians') == '':
data['civilians'] = 0
return super(StrikeSerializer, self).to_internal_value(data)
def create(self, validated_data):
return Strike.objects.create(**validated_data)