NameError:未定义名称'ResidentialReference‘[Django - ImageKit]

Question

由于某些原因，当我试图将ImageKit应用于模型以创建ImageField的缩略图时，会出现一个错误。我正在为Django使用ImageKit库，您可以找到这里

我的代码如下：

from django.db import models
from PIL import Image
import os
from django.contrib import admin
from imagekit.models import ImageSpecField
from imagekit.processors import ResizeToFill

# Create your models here.
class ResidentialReference(models.Model):
    image = models.ImageField(upload_to='images', blank="true",null="true")
    thumbnail = ImageSpecField(source='image',
                               processors=[ResizeToFill(100,50)],
                               format='JPEG',
                               options={'quality':60})

    title = models.CharField(max_length = 1000, default = 'Title here...' )
    postcode = models.TextField(max_length = 1000, default='Postcode here...')
    description = models.TextField(max_length = 12000, default = 'Technical Description here...')
    equipment = models.TextField(max_length = 1000, default = 'Equipment here...')
    output = models.TextField(max_length = 1000, default = 'Rated Output here...')
    partnership = models.TextField(max_length = 12000, default = 'Viessmann partnership details here...')



    def __unicode__(self):
        return self.title

    def create_thumb(self):
        residentialReference = ResidentialReference.objects.all()[0]
        print residentialReference.thumbnail.url
        print residentialReference.thumbnail.width

Answer 1

此错误与ImageKit无关。

你试图在它自己的定义中引用这个类。当定义类时将执行该代码，此时不存在ResidentialReference。

将该代码放入一个方法中，或者将其完全从类中删除。