docs on their GitHub page表明我正在尝试做的事情应该有效:
thumb_url = profile.photo['avatar'].url
在我的项目中,它会出错:
THUMBNAIL_ALIASES = {
'': {
'thumb': {'size': (64, 64), 'upscale': False},
},
}
class Image(models.Model):
place = models.ForeignKey(Place, models.CASCADE, 'images')
image = ThumbnailerImageField(upload_to='')
class ImageSerializer(serializers.Serializer):
image = serializers.ImageField()
thumb = serializers.ImageField(source='image.image["thumb"].url')
AttributeError: Got AttributeError when attempting to get a value for field `thumb` on serializer `ImageSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `Image` instance.
Original exception text was: 'ThumbnailerImageFieldFile' object has no attribute 'image["thumb"]'.
如果image
被删除,thumb
的网址会被正确序列化。如何让DRF序列化缩略图的网址?
答案 0 :(得分:1)
settings.py
THUMBNAIL_ALIASES = {
'': {
'avatar': {'size': (40, 40)},
'image': {'size': (128, 128)},
},
}
api / serializers.py
from easy_thumbnails.templatetags.thumbnail import thumbnail_url
class ThumbnailSerializer(serializers.ImageField):
def __init__(self, alias, *args, **kwargs):
super().__init__(*args, **kwargs)
self.read_only = True
self.alias = alias
def to_representation(self, value):
if not value:
return None
url = thumbnail_url(value, self.alias)
request = self.context.get('request', None)
if request is not None:
return request.build_absolute_uri(url)
return url
使用
from api.serializers import ThumbnailSerializer
class ProfileSerializer(serializers.ModelSerializer):
image = ThumbnailSerializer(alias='image')
avatar = ThumbnailSerializer(alias='avatar', source='image')