59 lines
2.2 KiB
Python
Executable File
59 lines
2.2 KiB
Python
Executable File
from django.db import models
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from django import forms
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from django.utils.text import capfirst
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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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class MultiSelectField(models.Field):
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__metaclass__ = models.SubfieldBase
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def get_internal_type(self):
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return "CharField"
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def get_choices_default(self):
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return self.get_choices(include_blank=False)
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def _get_FIELD_display(self, field):
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value = getattr(self, field.attname)
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choicedict = dict(field.choices)
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def formfield(self, **kwargs):
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# don't call super, as that overrides default widget if it has choices
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defaults = {'required': not self.blank, 'label': capfirst(self.verbose_name),
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'help_text': self.help_text, 'choices':self.choices}
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if self.has_default():
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defaults['initial'] = self.get_default()
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defaults.update(kwargs)
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return MultiSelectFormField(**defaults)
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def get_db_prep_value(self, value):
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if isinstance(value, basestring):
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return value
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elif isinstance(value, list):
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return ",".join(value)
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def to_python(self, value):
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if isinstance(value, list):
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return value
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return value.split(",")
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def contribute_to_class(self, cls, name):
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super(MultiSelectField, self).contribute_to_class(cls, name)
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if self.choices:
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func = lambda self, fieldname = name, choicedict = dict(self.choices):",".join([choicedict.get(value,value) for value in getattr(self,fieldname)])
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setattr(cls, 'get_%s_display' % self.name, func)
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