Hi everyone,
I'm attempting to do some image validation. Here is my model:
from django.db import models
GROUP_CHOICES = (
('Home Page', 'Home Page'),
('Tenets Sidebar', 'Tenets Sidebar'),
)
class Image(models.Model):
group = models.CharField(max_length=20, choices=GROUP_CHOICES)
name = models.CharField('Friendly Name', max_length=50)
image = models.ImageField(upload_to='images', help_text='Please
use an image no wider than 692px x 238px for heroes.<br />226px wide
for sidebar images.')
alt_text = models.CharField('Alt Text', max_length=100,
help_text='Text representation of the image.')
def __unicode__(self):
return self.name
def thumbnail_display(self):
dimensions = [(self.get_image_width() / 4),
(self.get_image_height() / 4)]
return '<img src="%s" width="%s" height="%s" alt="%s" />' %
(self.get_image_url(), dimensions[0], dimensions[1], self.alt_text)
thumbnail_display.allow_tags=True
def clean_image(self):
if self.clean_data.get('image'):
image_data = self.clean_data['image']
if 'error' in image_data:
raise forms.ValidationError(_('Please upload a valid
image. The file you uploaded was either not an image or a corrupted
image.'))
content_type = image_data.get('content-type')
if content_type:
main,sub = content_type.split('/')
if not (main == 'image' and sub in
['jpeg','jpg']):
raise forms.ValidationError(_('JPEG images
only please.'))
size = len(image_data['content'])
if size > 512:
raise forms.ValidationError(_('Image is too big.
512k maximum filesize.'))
width, height = image_data['dimensions']
if self.group == 'Home Page':
valid_dimensions = [692,400]
elif self.group == 'Tenets Sidebar':
valid_dimensions = [226,300]
if width > valid_dimensions[0]:
raise forms.ValidationError(_('Image max width is
' + valid_dimensions[0] + 'px.'))
if height > valid_dimensions[1]:
raise forms.ValidationError(_('Image max height is
' + valid_dimensions[1] + 'px.'))
return self.clean_data['image'].replace('\\', '/')
class Admin:
list_display = ('name','thumbnail_display')
list_filter = ('group',)
class Meta:
verbose_name_plural = 'Images'
I tried uploading a large image, 800 x 800 pixels, which should have
failed validation, but it didn't. What did I do wrong?
Thanks,
Brandon
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