如何在Django模型中获得图像文件大小？

Question

我想在上传后将图像文件大小保存在数据库中。在django模型中如何实现这一点？如果我能在视图中获得大小，它也会起作用。但是，由于一个社区帖子中可以有多个图片，我无法获得每个图片的大小。 My models.py文件：

from django.db import models
import os


class Community(models.Model):
    title = models.CharField(max_length=100)
    description = models.TextField(max_length=500)

    def __str__(self) -> str:
        return self.title


class CommunityImages(models.Model):
    post = models.ForeignKey(Community, on_delete=models.CASCADE)
    height = models.IntegerField(null=True, blank=True)
    width = models.IntegerField(null=True, blank=True)
    image = models.ImageField(upload_to='communityImages/%Y/%m/%d', blank=True, null=True, height_field='height', width_field='width')
    @property
    def images_exists(self):
        return self.communityImages.storage.exists(self.communityImages.name)
    def community(self):
        return self.post.id
    def __str__(self):
        return "%s %s " % (self.post_id, self.image, )
    class Meta:
        verbose_name_plural = "Community Images"

My views.py文件：

from django.http import JsonResponse
from .models import CommunityImages, Community
import json
import os


def image_detail(request, post_id):
    community_post = {}
    communityPostImages = list(CommunityImages.objects.filter(post=post_id).values('id','image', 'height', 'width'))
    
    for i in range(len(communityPostImages)):
        communityPostImages[i]['img_name'] = os.path.split(communityPostImages[i]['image'])[-1]
        communityPostImages[i]['type'] = os.path.splitext(communityPostImages[i]['img_name'])[-1].replace('.', '')
        communityPostImages[i]['dimension'] = str(communityPostImages[i]['height']) + "x" + str(communityPostImages[i]['width'])

    community_post['communityPostImages'] = communityPostImages
    data = json.dumps(community_post, indent=4, sort_keys=False, default=str)
    return JsonResponse(data, safe=False)

提前谢谢

Answer 1

您可以通过存储在FileField中的FieldFile的^{} [Django-doc]属性来获取此信息：

The result of the underlying Storage.size() method.

会议将：

Returns the total size, in bytes, of the file referenced by name. For storage systems that aren’t able to return the file size this will raise NotImplementedError instead.

因此，您可以通过以下方式获得文件的大小：

some_community_image.image.size  # size in bytes