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from django.db import models
from django.http import Http404
from django.utils import timezone
from .constants import STATUS_PUBLISHED, STATUS_DRAFT
class IssueManager(models.Manager):
def get_published(self, *args, **kwargs):
try:
return self.published(*args, **kwargs)[0]
except IndexError:
raise Http404
def published(self, journal=None, **kwargs):
issues = self.filter(status=STATUS_PUBLISHED, **kwargs)
if journal:
issues.filter(in_volume__in_journal__name=journal)
return issues
def in_draft(self, journal=None, **kwargs):
issues = self.filter(status=STATUS_DRAFT, **kwargs)
if journal:
issues.filter(in_volume__in_journal__name=journal)
return issues
def get_current_issue(self, *args, **kwargs):
return self.published(start_date__lte=timezone.now(),
until_date__gte=timezone.now(),
**kwargs).order_by('-until_date').first()
def get_last_filled_issue(self, *args, **kwargs):
return self.published(publication__isnull=False,
**kwargs).order_by('-until_date').first()
class PublicationManager(models.Manager):
def get_published(self, *args, **kwargs):
try:
return self.published(*args, **kwargs)[0]
except IndexError:
raise Http404
def published(self, **kwargs):
return self.filter(in_issue__status=STATUS_PUBLISHED, **kwargs)
def in_draft(self, **kwargs):
return self.filter(in_issue__status=STATUS_DRAFT, **kwargs)