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POAdding custom validation to a field, for the generic view CreateView
 

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  1. POAdding custom validation to a field, for the generic view CreateView
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    <h3>The problem</h3> <p>Add custom validation to a form field in Django 1.3, the form is created by the generic view CreateView.</p> <h3>The model</h3> <pre><code>class Picture(models.Model): file = models.ImageField(upload_to=get_image_path) filename = models.CharField(max_length=50, blank=True) user = models.ForeignKey(User, editable=False) upload_date = models.DateTimeField(auto_now_add=True,editable=False) </code></pre> <h3>Generic view CreateView, a bit modified</h3> <pre><code>class PictureCreateView(CreateView): model = Picture def clean_file(self,form): if image: if image._size &gt; settings.MAX_IMAGE_SIZE: raise ValidationError("Image file too large ( &gt; 20mb )") else: raise ValidationError("Couldn't read uploaded image") def get_form(self, form_class): form = super(PictureCreateView, self).get_form(form_class) form.instance.user = self.request.user return form def form_invalid(self, form): ...omitted none important code... response = JSONResponse(data, {}, response_mimetype(self.request)) response['Content-Disposition'] = 'inline; filename=files.json' return response # Called when we're sure all fields in the form are valid def form_valid(self, form): ...omitted none important code... response = JSONResponse(data, {}, response_mimetype(self.request)) response['Content-Disposition'] = 'inline; filename=files.json' return response </code></pre> <h2>My question is: How can I do custom validation on the file field, before form_valid() is reached?</h2> <h3>In short, what I've done so far</h3> <p>According to the documentation here - <a href="https://docs.djangoproject.com/en/dev/ref/forms/validation/" rel="nofollow">https://docs.djangoproject.com/en/dev/ref/forms/validation/</a> I should be able to override the file fields form validator, which I'm trying to do with clean_file() "The clean_() method in a form subclass - where is replaced with the name of the form field attribute. " This would have been easy if I had created the form manually, but it's created by Django from the model by the generic view. </p> <p>My current solution, which is a ugly hack: You can see that I've overridden form_valid() and form_invalid(), in form_valid() I now call clean_file() and if it's a error I call form_invalid(). This creates a few problems, for example I need to create the error message response manually.</p>
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