Specifically, I'd like to use this validation in the admin. Is the
best way to do this by overriding the save() method?
On May 12, 3:32 pm, Brandon Taylor <[EMAIL PROTECTED]> wrote:
> 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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