How to get Image file size in django model?

Question

I wanna save image file size in database after uploading it. How can I do that in django models? It'll also work if I can get the size in the views. But since there can be multiple images in one Community post, I am unable to get the size for each of them. My models.py file:

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 file:

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)

Thanks in advance!

willeM_ Van Onsem · Accepted Answer · 2021-06-19 06:05:16Z

5

You can obtain this with the .size [Django-doc] attribute of the FieldFile that is stored in the FileField:

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

The Storage.size(…) method [Django-doc] will:

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.

Here you thus can obtain the size of the file with:

some_community_image.image.size  # size in bytes

answered Jun 19, 2021 at 6:05

willeM_ Van Onsem

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2 Comments

Zubayer Over a year ago

I know that. But I wonder if I could do that keeping the ImageField. Thank you

willeM_ Van Onsem Over a year ago

@Zubayer: this also works for an ImageField, since an ImageField is a subclass of a FileField, so everything that can be done with a FileField, can be done with an ImageField.

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