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PODjango custom (multi)widget input validation
 

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  1. PODjango custom (multi)widget input validation
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    <p>What is the correct method for validating input for a custom multiwidget in each of these cases:</p> <ol> <li>if I want to implement a custom Field?</li> <li>if I want to use an existing database field type (say DateField)?</li> </ol> <p>The motivation for this comes from the following two questions:</p> <ol> <li><a href="https://stackoverflow.com/questions/3511855/how-do-i-use-djangos-multiwidget/4663801#4663801">How do I use django's multi-widget</a>?</li> <li><a href="https://stackoverflow.com/questions/4662835/django-subclassing-multiwidget-reconstructing-date-on-post-using-custom-multiwi">Django subclassing multiwidget</a></li> </ol> <p>I am specifically interested in the fact that I feel I have cheated. I have used <code>value_from_datadict()</code> like so:</p> <pre><code>def value_from_datadict(self, data, files, name): datelist = [widget.value_from_datadict(data, files, name + '_%s' % i) for i, widget in enumerate(self.widgets)] try: D = date(day=int(datelist[0]), month=int(datelist[1]), year=int(datelist[2])) return str(D) except ValueError: return None </code></pre> <p>Which looks through the <code>POST</code> dictionary and constructs a value for my widget (see linked questions). However, at the same time I've tacked on some validation; namely if the creation of <code>D</code> as a date object fails, I'm returning <code>None</code> which will fail in the <code>is_valid()</code> check.</p> <p>My third question therefore is should I be doing this some other way? For this case, I do not want a custom field.</p> <p>Thanks.</p>
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