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# -*- coding: utf-8 -*-
from __future__ import unicode_literals
import sys
from datetime import datetime
from django.core.urlresolvers import reverse
from django.db import models
from django.utils.timezone import utc
from django.utils.translation import ugettext_lazy as _
from django.utils.encoding import python_2_unicode_compatible
from django.utils import six
newsbox_models = []
def newsbox_mcls_processor(mcls, class_name, class_bases, class_attrs, base, newsbox_opts):
class_attrs['newsbox_title'] = models.CharField(
verbose_name=_('title'),
max_length=255)
class_attrs['newsbox_slug'] = models.SlugField(
verbose_name=_('slug'),
unique_for_date='newsbox_date',
help_text=_('The part of the title that is used in the URL'))
class_attrs['newsbox_summary'] = models.TextField(
verbose_name=_('summary'))
class_attrs['newsbox_body'] = models.TextField(
verbose_name=_('body'),
null=False, blank=True)
newsbox_opts['trans_fieldnames']+=[
'newsbox_title', 'newsbox_slug',
'newsbox_summary', 'newsbox_body']
def newsboxseo_mcls_processor(mcls, class_name, class_bases, class_attrs, base, newsbox_opts):
class_attrs['newsbox_meta_description'] = models.TextField(
verbose_name=_('meta description'),
max_length=255, blank=True, null=True)
class_attrs['newsbox_meta_keywords'] = models.CharField(
verbose_name=_('meta keywords'),
max_length=255, blank=True, null=True)
newsbox_opts['trans_fieldnames']+=[
'newsbox_meta_description', 'newsbox_meta_keywords']
class NewsboxManager(models.Manager):
"""
Filter published news
"""
def published(self):
now = datetime.utcnow().replace(tzinfo=utc)
query_set = super(NewsboxManager, self).get_query_set().filter(
# Only published News
models.Q(newsbox_published=True),
).exclude(
# exclude news with publication start date in the future
models.Q(newsbox_publication_start_date__gt=now)
)
if issubclass(self.model, NewsboxExpiredBase):
query_set = query_set.exclude(
# exclude news which are obsolete
models.Q(newsbox_publication_end_date__lte=now)
)
return query_set
class NewsboxModelBase(models.base.ModelBase):
"""
Metaclass used to inject django-newsboxfunctionalities into django
orm.
"""
def __new__(mcls, class_name, class_bases, class_attrs):
super_new = super(NewsboxModelBase, mcls).__new__
# six.with_metaclass() inserts an extra class called 'NewBase' in the
# inheritance tree: Model -> NewBase -> object. But the initialization
# should be executed only once for a given model class.
# attrs will never be empty for classes declared in the standard way
# (ie. with the `class` keyword). This is quite robust.
if class_name == 'NewBase' and class_attrs == {}:
return super_new(mcls, class_name, class_bases, class_attrs)
# Also ensure initialization is only performed for subclasses of Model
# (excluding Model class itself).
parents = [b for b in class_bases if isinstance(b, NewsboxModelBase) and
not (b.__name__ == 'NewBase' and b.__mro__ == (b, object))]
if not parents:
return super_new(mcls, class_name, class_bases, class_attrs)
#retrieve newsbox options in Meta class and delete these from the
#Meta class to avoid django complain about unsupported keys.
#We register our meta options in `_newsbox_meta`
attr_meta = class_attrs.get('Meta', None)
if attr_meta and not getattr(attr_meta, 'ordering', None):
class_attrs['Meta'].ordering = ('-newsbox_date',)
abstract = getattr(attr_meta, 'abstract', False)
newsbox_opts = {}
newsbox_opts_keys = [
'detail_url_name',
'metaclass_base_processor',
'metaclass_final_processor',
'trans_fieldnames']
for opt in newsbox_opts_keys:
newsbox_opt = 'newsbox_' + opt
if hasattr(attr_meta, newsbox_opt):
newsbox_opts[opt] = getattr(attr_meta, newsbox_opt)
delattr(attr_meta, newsbox_opt)
if 'trans_fieldnames' not in newsbox_opts:
newsbox_opts['trans_fieldnames'] = []
# register newsbox_objects manager
class_attrs['newsbox_objects'] = NewsboxManager()
#Call specific metaclass processor of all bases
if not abstract :
for base in class_bases:
try:
processor = base._newsbox_meta['metaclass_base_processor']
except (AttributeError, KeyError):
continue
processor = getattr(sys.modules[base.__module__], processor)
processor(mcls, class_name, class_bases, class_attrs, base, newsbox_opts)
for base in class_bases:
try:
processor = base._newsbox_meta['metaclass_final_processor']
except (AttributeError, KeyError):
continue
processor = getattr(sys.modules[base.__module__], processor)
processor(mcls, class_name, class_bases, class_attrs, base, newsbox_opts)
if not 'default_manager' in class_attrs:
class_attrs['default_manager'] = class_attrs['newsbox_objects']
if not 'objects' in class_attrs:
class_attrs['objects'] = class_attrs['newsbox_objects']
# contructs class
cls = super_new(mcls, class_name, class_bases, class_attrs)
#Add the detail_url_name to _newsbox_meta. if not defined, we build the
#default one with this format : <app_label>_<model_name>_detail
#Names ar lowered.
if not abstract:
detail_url_name = newsbox_opts.get(
'detail_url_name',
"%s_%s_detail" % (cls._meta.app_label.lower(),
cls._meta.model_name.lower(),)
)
newsbox_opts.update(
detail_url_name=detail_url_name,
)
newsbox_models.append(cls)
cls.add_to_class('_newsbox_meta', newsbox_opts)
return cls
@python_2_unicode_compatible
class NewsboxBase(six.with_metaclass(NewsboxModelBase, models.Model)):
"""
Abstract class to build your own news
"""
# Automatic fields
newsbox_creation_date = models.DateTimeField(
verbose_name=_('creation date'),
auto_now_add=True,
editable=False)
newsbox_changed_date = models.DateTimeField(
verbose_name=_('last update date'),
auto_now=True,
editable=False)
# Basic Publication Fields
newsbox_date = models.DateTimeField(
verbose_name=_('date'),
default=datetime.now, db_index=True,
)
newsbox_publication_start_date = models.DateTimeField(
verbose_name=_('publication start date'),
default=datetime.now, db_index=True,
help_text=_(
'When the news should go live. '
'Status must be "Published" for news to go live.'))
newsbox_published = models.BooleanField(
verbose_name=_('published'),
blank=True,
default=True,)
default_manager = NewsboxManager()
objects = default_manager
def __str__(self):
return six.text_type(self.newsbox_title)
def has_publish_permission(self, request):
if request.user.is_superuser:
return True
return request.user.has_perm('newsbox.publish_news', self)
def has_change_permission(self, request):
if request.user.is_superuser:
return True
return request.user.has_perm('newsbox.change_news', self)
def is_published(self):
if not self.newsbox_published:
return False
if isinstance(self, NewsboxExpiredBase):
now = datetime.utcnow().replace(tzinfo=utc)

Dylann Cordel
committed
if self.newsbox_publication_start_date and now < self.newsbox_publication_start_date:

Dylann Cordel
committed
if self.newsbox_publication_end_date and now > self.newsbox_publication_end_date:
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return False
return True
def get_slug(self, *args, **kwargs):
return self.newsbox_slug
def get_absolute_url(self, *args, **kwargs):
return reverse(self._newsbox_meta['detail_url_name'], args=(
self.newsbox_date.strftime("%Y"),
self.newsbox_date.strftime("%m"),
self.newsbox_date.strftime("%d"),
self.get_slug(),))
class Meta:
abstract = True
verbose_name = _('news')
verbose_name_plural = _('news')
ordering = ('-newsbox_date',)
newsbox_metaclass_base_processor = 'newsbox_mcls_processor'
class NewsboxExpiredBase(six.with_metaclass(NewsboxModelBase, models.Model)):
"""
Define News which expires in time and will not be displayed in front
"""
newsbox_publication_end_date = models.DateTimeField(
verbose_name=_('publication end date'),
null=True, blank=True, db_index=True,
help_text=_(
'When to expire the news.'
'Leave empty to never expire.'))
class Meta:
abstract = True
class NewsboxSEOBase(six.with_metaclass(NewsboxModelBase, models.Model)):
"""
Define News which have SEO fields
"""
# SEO Fields
newsbox_indexed = models.BooleanField(
verbose_name=_('indexed'),
default=True,
help_text=_(
'An unindexed news will not be indexed by search engines.'))
class Meta:
abstract = True
newsbox_metaclass_base_processor = 'newsboxseo_mcls_processor'