Initial version

CHANGES.rst

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+0.0.1 (2012-09-27)
+------------------
+
+* Initial version from the next `snippet <http://djangosnippets.org/snippets/1200/>`_

MANIFEST.in

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+include README.rst
+include AUTHORS
+include CHANGES
+include *.py

setup.py

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+#http://djangosnippets.org/users/danielroseman/
+# -*- coding: utf-8 -*-
+
+import os
+from setuptools import setup, find_packages
+
+
+def read(*rnames):
+    return open(os.path.join(os.path.dirname(__file__), *rnames)).read()
+
+setup(
+    name="django-multiselectfield",
+    version="0.0.1",
+    author="Daniel Roseman",
+    description="Django multiple select field",
+    long_description=(read('README.rst') + '\n\n' + read('CHANGES.rst')),
+    classifiers=[
+        'Development Status :: 4 - Beta',
+        'Framework :: Django',
+        'License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)',
+    ],
+    license="LGPL 3",
+    keywords="django,multiple,select,field,choices",
+    url='https://github.com/goinnn/django-multiselectfield',
+    packages=find_packages(where='src'),
+    package_dir={'': 'src'},
+    include_package_data=True,
+    zip_safe=False,
+)

src/multiselectfield/__init__.py

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+from multiselectfield.db.fields import MultiSelectField
+from multiselectfield.forms.fields import MultiSelectFormField

src/multiselectfield/db/fields.py

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+from django.db import models
+from django.utils.text import capfirst
+from django.core import exceptions
+
+from multiselectfield import MultiSelectFormField
+
+
+class MultiSelectField(models.Field):
+    """ Choice values can not contain commas. """
+    __metaclass__ = models.SubfieldBase
+
+    def get_internal_type(self):
+        return "CharField"
+
+    def get_choices_default(self):
+        return self.get_choices(include_blank=False)
+
+    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 _get_FIELD_display(self, field):
+        value = getattr(self, field.attname)
+        choicedict = dict(field.choices)
+
+    def value_to_string(self, obj):
+        value = self._get_val_from_obj(obj)
+        return self.get_db_prep_value(value)
+
+    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):
+                raise exceptions.ValidationError(self.error_messages['invalid_choice'] % value)
+        return
+
+    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'] = self.get_default()
+        defaults.update(kwargs)
+        return MultiSelectFormField(**defaults)
+
+    def get_db_prep_value(self, value, connection, 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)

src/multiselectfield/forms/fields.py

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+from django import forms
+from django.contrib.humanize.templatetags.humanize import apnumber
+from django.template.defaultfilters import pluralize
+
+
+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