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copied!<p>If you want to validate a certain field depending on the values of other fields, you need to to it at the form level and overwrite the field's <code>clean</code> method. <a href="https://docs.djangoproject.com/en/dev/ref/forms/validation/#cleaning-and-validating-fields-that-depend-on-each-other" rel="nofollow">Here's the docs on the subject</a> - they are very good. </p> <pre><code>class CustomForm(forms.Form): custom_field = CustomField() def clean(self): cleaned_data = super(CustomForm, self).clean() custom_field = cleaned_data.get("custom_field") ... </code></pre> <p><a href="https://docs.djangoproject.com/en/dev/ref/forms/validation/#form-and-field-validation" rel="nofollow">If you look at the flow of how forms are validated</a>, you will see that the <strike><code>clean</code> method is run if all the other fields validate independently, so at this stage, the form can be considered valid:</strike> </p> <blockquote> <p>These methods are run in the order given above, one field at a time. That is, for each field in the form (in the order they are declared in the form definition), the <code>Field.clean()</code> method (or its override) is run, then <code>clean_<fieldname>()</code>. Finally, once those two methods are run for every field, the <code>Form.clean()</code> method, or its override, is executed.</p> </blockquote> <p>The final clean method is actually run regardless of if there's an error so you have to iterate through the <code>cleaned_data</code> to make sure there are no errors</p> <blockquote> <p>The clean() method for the Form class or subclass is always run. If that method raises a ValidationError, cleaned_data will be an empty dictionary.</p> <p>The previous paragraph means that if you are overriding Form.clean(), you should iterate through self.cleaned_data.items(), possibly considering the _errors dictionary attribute on the form as well. In this way, you will already know which fields have passed their individual validation requirements.</p> </blockquote>

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