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CodeLookupField

Author:
girasquid
Posted:
June 8, 2009
Language:
Python
Version:
1.0
Score:
0 (after 0 ratings)

This is a custom form-field designed to make those optional "enter a discount code" fields a little easier to deal with. You create one like this:

code = CodeLookupField(model=MyModel, field_name='slug', max_length=20)

And then when you validate your form, cleaned_data['code'] will be the actual object if anything was retrieved, or None if the user entered a bad piece of data.

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class CodeLookupField(forms.CharField):
    
    def __init__(self, model, field_name, *args, **kwargs):
        self.model = model
        self.field_name = field_name
        super(CodeLookupField, self).__init__(*args, **kwargs)
    
    def clean(self, data):
        try:
            return self.model.objects.get(**{self.field_name:data})
        except self.model.DoesNotExist:
            return None

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