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PODjango custom validation in model form for imagefield (max file size etc.)
 

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  1. PODjango custom validation in model form for imagefield (max file size etc.)
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    <p>I have a modelform that has an imagefield called 'banner' and I am trying to validate the file size and dimesions and provide an error if the image is too large.</p> <p>Here is the models.py:</p> <pre><code>class Server(models.Model): id = models.AutoField("ID", primary_key=True, editable=False) servername = models.CharField("Server Name", max_length=20) ip = models.CharField("IP Address", max_length=50) port = models.CharField("Port", max_length=5, default='25565') banner = models.ImageField("Banner", upload_to='banners', max_length=100) description = models.TextField("Description", blank=True, max_length=3000) rank = models.IntegerField(default=0) votes = models.IntegerField(default=0) website = models.URLField("Website URL", max_length=200, blank=True) user = models.ForeignKey(User) motd = models.CharField("MOTD", max_length=150, default='n/a') playersonline = models.CharField("Online Players", max_length=7, default='n/a') online = models.BooleanField("Online", default=False) sponsored = models.BooleanField("Sponsored", default=False) lastquery = models.DateTimeField('Last Queried', auto_now=True) slugurl = models.SlugField("SlugURL", max_length=50) def __unicode__(self): return "%s (%s:%s)" % (self.servername, self.ip, self.port) </code></pre> <p>Here is the forms.py with the custom validation:</p> <pre><code>class AddServer(ModelForm): class Meta: model = Server fields = ('servername', 'ip', 'port', 'website', 'description', 'banner') # Add some custom validation to our image field def clean_image(self): image = self.cleaned_data.get('banner', False) if image: if image._size &gt; 1*1024*1024: raise ValidationError("Image file too large ( maximum 1mb )") if image._height &gt; 60 or image._width &gt; 468: raise ValidationError("Image dimensions too large ( maximum 468x60 pixels )") return image else: raise ValidationError("Couldn't read uploaded image") </code></pre> <p>From what I have read this should work but the image just uploads regardless of the size.</p> <p>Am I doing something wrong or is there a better way to go about doing this?</p>
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    1. COIt looks like your raise's aren't being executed. Check if the if conditions are actually true. (and that in your views.py you are actually checking cleaned_data)
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    2. COThanks! Turns out I forgot to check cleaned_data! *facepalm*
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    3. COimage._height and image._width doesn't seem to exist? I found: from django.core.files.images import get_image_dimensions which seems to work better for me.
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      1. USfreyley
 

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