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Automatically trim newforms text fields

Author:
miracle2k
Posted:
September 24, 2007
Language:
Python
Version:
.96
Score:
0 (after 0 ratings)

Makes sure the value a user entered into a a text-based field is automatically trimmed during form cleaning / validation.

The 'field' parameter is expected to be a newforms.fields.Field instance.Only modifies str and unicode descending values, and passes everything else on untouched.

Example:

form = form_for_model(Person)
make_trimming(form.fields['name'])

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def make_trimming(field):
    def clean_hook(self, old_clean, value):
        result = old_clean(value)
        if isinstance(result, (str, unicode,)):
            result = result.strip()
        return result
    old_clean = field.clean
    import new
    field.clean = new.instancemethod(
        lambda self, value: clean_hook(self, old_clean, value),
        field, field.__class__)

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