我可以在 def 函数中使用 django fileds 值吗?

Can I use django fileds values in def functions?

我正在尝试制作一个在上传前调整图像大小的功能。我在 interent 上找到了一些东西,它正在工作,但我想改进它。而不是让 output_size = (320, 560) [始终作为默认值] 我想要一些 django 字段并在每次需要 django admin 时更改它。这就是我添加 image_heightimage_width 字段的原因。

在我看来这样做是解决方案 output_size = (image_height, image_width) 但它不起作用

output_size = (image_height, image_width)
NameError: name 'image_height' is not defined

如何使用 image_heightimage_width 字段并将值添加到 output_size

我的models.py

from __future__ import unicode_literals
from django.db import models
from django.urls import reverse

from PIL import Image

def upload_location(instance, filename):
    return "%s/%s" %('image/service', filename)
# Create your models here.
class Services(models.Model):
    title  = models.CharField(max_length=120)
    content  = models.TextField(null=True, blank=True)
    image = models.ImageField(upload_to=upload_location, blank=True, null=True)
    image_height = models.PositiveIntegerField(default=320)
    image_width = models.PositiveIntegerField(default=560)
    
    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)
        img = Image.open(self.image.path)

        if img.height > 320 or img.weight > 560:
            output_size = (image_height, image_width)
            img.thumbnail(output_size)
            img.save(self.image.path)

    def __unicode__(self):
        return self.title

    def __str__(self):
        return self.title

使用self

class Services(models.Model):
    # rest of your code
    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)
        img = Image.open(self.image.path)

        if img.height > 320 or img.weight > 560:

            <b>output_size = (self.image_height, self.image_width)</b>

            img.thumbnail(output_size)
            img.save(self.image.path)