serializer.is_valid()返回500内部服务器错误

Question

我是Django新手，在为post创建Django -rest-framework API时遇到了麻烦，继承了APIView。我使用的是一个序列化器，它继承了django的ModelSerializer。当我尝试验证序列化器时，我看到500内部服务器错误。

color.js使用Django rest框架发布图像，如下所示。

function PersonalColorScreen({navigation,route}) {
const {image} = route.params;
console.log('uri is', image.uri);
const [userToken, setUserToken] = React.useState(route.params?.userToken);
const requestHeaders = {
headers: {
"Content-Type": "multipart/form-data"
}
}
// helper function: generate a new file from base64 String
//convert base64 image data to file object to pass it onto imagefield of serializer.
//otherwise, serializer outputs 500 Internal server error code
const dataURLtoFile = (dataurl, filename) => {
const arr = dataurl.split(',')
const mime = arr[0].match(/:(.*?);/)[1]
const bstr = atob(arr[1])
let n = bstr.length
const u8arr = new Uint8Array(n)
while (n) {
u8arr[n - 1] = bstr.charCodeAt(n - 1)
n -= 1 // to make eslint happy
}
return new File([u8arr], filename, { type: mime })
}
//random number between 0-9
function getRandomInt(max) {
return Math.floor(Math.random() * max);
}

// generate file from base64 string
const file = dataURLtoFile(image.uri, `${getRandomInt(10)}.png`)
const formData= new FormData();
formData.append('img',file,file.name);
console.log(file.name);
//axios post request to send data
// axios.post('http://localhost:8000/accounts/personalcolor/',  formData,requestHeaders)
//multipartparser
axios.post('http://localhost:8000/accounts/personalcolor/', formData, requestHeaders)
.then(res => {
console.log(res);
if (res.data === 'upload another image') {
setimageError('upload another image');
} else {
// signUp(userToken);
let color;
switch (res.data){
case ('spring'):
color = 'spring';
break;
case ('summer'):
color = 'summer';
break;
case ('fall'):
color = 'fall';
break;
case ('winter'):
color = 'winter';
break;
}
}
})
.catch(err => {
console.error(err.response.data)
})

view.py处理发布的图像。我正在尝试保存序列化器以将图像保存在媒体文件夹中。应该提取图像路径。

@api_view(['POST'])
def personalcolor(request):
serializer = ColorSerializer(request.data)
# validation of input data
if serializer.is_valid():
# serializer.save()
return Response(serializer.data, status = status.HTTP_201_CREATED)
else:
return Response(serializer.errors, status = status.HTTP_400_BAD_REQUEST)

model.py

class Personalcolor(models.Model):
objects = models.Manager()
img = models.ImageField('personal_img',upload_to="personalcolor/", blank=True)

serializer.py

class ColorSerializer(serializers.ModelSerializer):
class Meta:
model = Personalcolor
fields = ('img',)

执行代码返回"加载资源失败:服务器响应状态为500(内部服务器错误)"。我认为序列化器有问题，但在网上搜索后也找不出来。如有任何帮助，我将不胜感激。

Answer 1

检查您发送的JSON格式是否正确。json键必须与模型字段名相同…它必须与模型字段名的结构完全一致。

And in your Serializer, change;

fields = ('img')

fields = ['img']

如果你想返回所有的模型实例，使用;

fields = '__all__'