django-imagekit获取模型属性 [英] django-imagekit get model attribute

问题描述

我有以下模型：

class PropertyPhoto(models.Model):
    property = models.ForeignKey('Property')
    photo_show = ProcessedImageField(upload_to=get_web_watermark,
                                  processors=[Watermark()],                                     
                                  options={'quality': 95})

和自定义水印类：

class Watermark(object):    

    def process(self, image):
        try:
            this_property = Property.objects.get(pk=*self.property.id*)
        except Property.DoesNotExist:
            print "error"

我该如何从Watermark类内部访问我的模型属性 property？

How do I access my model attribute "property" from inside Watermark class?

谢谢

推荐答案

您需要创建一个自定义规范，该规范从模型中获取您所需的信息，并将其传递给处理器。该文档显示示例：

You'll need to create a custom spec that gets the information you need from the model and passes it to your processor. The docs show an example:

from django.db import models
from imagekit import ImageSpec, register
from imagekit.models import ImageSpecField
from imagekit.processors import ResizeToFill
from imagekit.utils import get_field_info

class AvatarThumbnail(ImageSpec):
    format = 'JPEG'
    options = {'quality': 60}

    @property
    def processors(self):
        model, field_name = get_field_info(self.source)
        return [ResizeToFill(model.thumbnail_width, thumbnail.avatar_height)]

register.generator('myapp:profile:avatar_thumbnail', AvatarThumbnail)

class Profile(models.Model):
    avatar = models.ImageField(upload_to='avatars')
    avatar_thumbnail = ImageSpecField(source='avatar',
                                      id='myapp:profile:avatar_thumbnail')
    thumbnail_width = models.PositiveIntegerField()
    thumbnail_height = models.PositiveIntegerField()

请注意，您可以将规范直接传递给 ImageSpecField 构造函数（使用 spec kwarg），而不是如上所示，使用一个id（并使用 id kwarg）注册它。

Note that you can pass the spec directly to the ImageSpecField constructor (using the spec kwarg) instead of registering it with an id (and using the id kwarg) as shown above.

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