20 lines
811 B
Python
20 lines
811 B
Python
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from django import forms
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from django.contrib.humanize.templatetags.humanize import apnumber
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from django.template.defaultfilters import pluralize
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class MultiSelectFormField(forms.MultipleChoiceField):
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widget = forms.CheckboxSelectMultiple
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def __init__(self, *args, **kwargs):
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self.max_choices = kwargs.pop('max_choices', 0)
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super(MultiSelectFormField, self).__init__(*args, **kwargs)
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def clean(self, value):
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if not value and self.required:
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raise forms.ValidationError(self.error_messages['required'])
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if value and self.max_choices and len(value) > self.max_choices:
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raise forms.ValidationError('You must select a maximum of %s choice%s.'
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% (apnumber(self.max_choices), pluralize(self.max_choices)))
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return value
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