Return image url in Django Rest Framework

问题:

I am using Django Rest Framework and have the following model:

class Picture(models.Model):
    some_field = models.ForeignKey(some_model)
    image = models.ImageField()

I would like to write a GET endpoint that returns the url of the image. This is what I've done so far

def get(self, request, aid):
    '''
    Get Image
    '''
    try:
        picture = Picture.objects.filter(some_field=aid)
    except Picture.DoesNotExist:
        raise Http404

    serialiser = PictureSerialiser(picture)
    return Response(serialiser.data)

and my Serialiser as follows:

class PictureSerialiser(serializers.ModelSerializer):

    class Meta:
        model = Picture
        fields = ('field', 'image')

How do I make sure that the response is {field:'Value here', image:'url to image'}?

回答1:

You could do this with a custom serializer method like so:

class PictureSerialiser(serializers.ModelSerializer):

    image_url = serializers.SerializerMethodField('get_image_url')

    class Meta:
        model = Picture
        fields = ('field', 'image', 'image_url')

    def get_image_url(self, obj):
        return obj.image.url