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PODjango - Saving an image manually to an ImageField field
 

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  1. PODjango - Saving an image manually to an ImageField field
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    <p>The following code takes an image after it gets saved and makes a thumbnail out of it:</p> <pre><code>class Image(models.Model): image = models.ImageField(upload_to='images') thumbnail = models.ImageField(upload_to='images/thumbnails', editable=False) def save(self, *args, **kwargs): super(Image, self).save(*args, **kwargs) if self.image: from PIL import Image as ImageObj from cStringIO import StringIO from django.core.files.uploadedfile import SimpleUploadedFile try: # thumbnail THUMBNAIL_SIZE = (160, 160) # dimensions image = ImageObj.open(self.image) # Convert to RGB if necessary if image.mode not in ('L', 'RGB'): image = image.convert('RGB') # create a thumbnail + use antialiasing for a smoother thumbnail image.thumbnail(THUMBNAIL_SIZE, ImageObj.ANTIALIAS) # fetch image into memory temp_handle = StringIO() image.save(temp_handle, 'png') temp_handle.seek(0) # save it file_name, file_ext = os.path.splitext(self.image.name.rpartition('/')[-1]) suf = SimpleUploadedFile(file_name + file_ext, temp_handle.read(), content_type='image/png') self.thumbnail.save(file_name + '.png', suf, save=False) except ImportError: pass </code></pre> <p>It's working fine, the original image + the thumbnail are both being uploaded, and image is being assigned the correct path.</p> <p>The only problem is thumbnail is not being assigned the path of the newly created thumbnail - it's empty in the database. I have read the documentation, and it looks like if I save the thumbnail with save=True it should fix my problem:</p> <pre><code>self.thumbnail.save(file_name + '.png', suf, save=True) </code></pre> <p>However, doing this is raising the following:</p> <pre><code>Django Version: 1.3.1 Exception Type: IOError Exception Value: cannot identify image file </code></pre> <p>I can't figure out what I'm doing wrong.</p>
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