- from django import forms
- from django.db import models
- from django.utils.text import capfirst
- from django.core import exceptions
- class MultiSelectFormField(forms.MultipleChoiceField):
- widget = forms.CheckboxSelectMultiple
- def __init__(self, *args, **kwargs):
- self.max_choices = kwargs.pop('max_choices', 0)
- super(MultiSelectFormField, self).__init__(*args, **kwargs)
- def clean(self, value):
- if not value and self.required:
- raise forms.ValidationError(self.error_messages['required'])
- # if value and self.max_choices and len(value) > self.max_choices:
- # raise forms.ValidationError('You must select a maximum of %s choice%s.'
- # % (apnumber(self.max_choices), pluralize(self.max_choices)))
- return value
- class MultiSelectField(models.Field):
- __metaclass__ = models.SubfieldBase
- def get_internal_type(self):
- return "CharField"
- def get_choices_default(self):
- return self.get_choices(include_blank=False)
- def _get_FIELD_display(self, field):
- value = getattr(self, field.attname)
- choicedict = dict(field.choices)
- def formfield(self, **kwargs):
- # don't call super, as that overrides default widget if it has choices
- defaults = {'required': not self.blank, 'label': capfirst(self.verbose_name),
- 'help_text': self.help_text, 'choices': self.choices}
- if self.has_default():
- defaults['initial'] = self.get_default()
- defaults.update(kwargs)
- return MultiSelectFormField(**defaults)
- def get_prep_value(self, value):
- return value
- 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:
- func = lambda self, fieldname = name, choicedict = dict(self.choices): ",".join([choicedict.get(value, value) for value in getattr(self, fieldname)])
- 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 (int(opt_select) not in arr_choices): # the int() here is for comparing with integer choices
- raise exceptions.ValidationError(self.error_messages['invalid_choice'] % value)
- return
- def get_choices_selected(self, arr_choices=''):
- if not arr_choices:
- return False
- list = []
- for choice_selected in arr_choices:
- list.append(choice_selected[0])
- return list
- def value_to_string(self, obj):
- value = self._get_val_from_obj(obj)
- return self.get_db_prep_value(value)
- #该片段来自于http://www.codesnippet.cn/detail/290420149409.html
来源: http://www.codesnippet.cn/detail/290420149409.html