from django.db import models from django.utils.text import capfirst from ..forms.fields import MultiSelectFormField from ..utils.apps import isinstalled class MultiSelectField(models.CharField): __metaclass__ = models.SubfieldBase def formfield(self, **kwargs): defaults = { 'required': not self.blank, 'label': capfirst(self.verbose_name), 'help_text': self.help_text, 'choices': self.choices } if self.has_default(): defaults['initial'] = eval(self.get_default()) defaults.update(kwargs) return MultiSelectFormField(**defaults) def get_db_prep_value(self, value, connection=None, prepared=False): if isinstance(value, basestring): return value elif isinstance(value, list): return ','.join(value) def to_python(self, value): if value is not None: return value if isinstance(value, list) else value.split(',') return '' def contribute_to_class(self, cls, name): super(MultiSelectField, self).contribute_to_class(cls, name) if self.choices: def func(self, field=name, choices=dict(self.choices)): ','.join([ choices.get(value, value) for value in getattr(self, field) ]) setattr(cls, 'get_%s_display' % self.name, func) def validate(self, value, model_instance): arr_choices = self.get_choices_selected(self.get_choices_default()) for opt_select in value: if (opt_select not in arr_choices): msg = self.error_messages['invalid_choice'] % value raise exceptions.ValidationError(msg) return def get_choices_selected(self, arr_choices=''): if not arr_choices: return False return [ value for value,__ in arr_choices ] class NullableCharField(models.CharField): def get_db_prep_value(self, value, connection=None, prepared=False): return value or None if isinstalled('south'): from south.modelsinspector import add_introspection_rules add_introspection_rules([], ["^orchestra\.models\.fields\.MultiSelectField"]) add_introspection_rules([], ["^orchestra\.models\.fields\.NullableCharField"])