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PODjango: how to cleanup form fields and avoid code duplication
 

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  1. PODjango: how to cleanup form fields and avoid code duplication
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    <p>Quite often I need to filter some form data before using it (saving to database etc.) Let's say I want to strip whitespaces and replace repeating whitespaces with a single one in most of the text fields, in many forms. It's not difficult to do this using <code>clean_&lt;fieldname&gt;</code> methods:</p> <pre><code># Simplified model with two text fields class MyModel(models.Model): title = models.CharField() description = models.CharField() # Model-based form class MyForm(forms.ModelForm): class Meta: model = MyModel def clean_title(self): title = self.cleaned_data['title'] return re.sub(r'\s{2,}', ' ', title.strip()) def clean_description(self): description = self.cleaned_data['description'] return re.sub(r'\s{2,}', ' ', description.strip()) </code></pre> <p>It does exactly what I need, and has a nice side effect which I like: if user enters only whitespaces, the field will be considered empty and therefore invalid (if it is required) and I don't even have to throw a <code>ValidationError</code>.</p> <p>The obvious problem here is code duplication. Even if I'll create some function for that, say <code>my_text_filter</code>, I'll have to call it for every text field in all my forms:</p> <pre><code>from myproject.filters import my_text_filter class MyForm(forms.ModelForm): class Meta: model = MyModel def clean_title(self): return my_text_filter(self.cleaned_data['title']) def clean_description(self): return my_text_filter(self.cleaned_data['description']) </code></pre> <p>The question: is there any standard and simple way in Django (I use version 1.2 if that matters) to do this (like, for example, by adding property <code>validators = {'title': my_text_filter, 'description': my_text_filter}</code> to <code>MyModel</code>), or at least some more or less standard workaround? I've read about form validation and validators in the documentation, but couldn't find what I need there.</p>
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    1. USAlexander Konstantinov
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    1. COIf you want to do something for more than one field at once you could use the form's `clean` mehod instead of writing one for each field!
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      1. USBernhard Vallant
 

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