# coding=utf-8
from django.db import models
from django.db.models import Prefetch
from django.utils.encoding import python_2_unicode_compatible
from django.utils.translation import ugettext_lazy as _
from model_utils.models import TimeStampedModel
from .validators import is_external_or_valid_url, is_external_url
class ElementQuerySet(models.QuerySet):
def root_with_children(self, visible=True):
qs = self
qs_children = Element.objects.all()
if visible is not None:
qs = qs.filter(visible=visible)
qs_children = qs_children.filter(visible=visible)
return qs.prefetch_related(Prefetch('element_set',
queryset=qs_children,
to_attr='children_set'))
def with_children_count(self):
return self.annotate(children_count=models.Count('element'))
[dokumenty]@python_2_unicode_compatible
class Element(TimeStampedModel):
name = models.CharField(verbose_name=_("Name"), max_length=50)
url = models.CharField(verbose_name=_("URL"),
max_length=100,
validators=[is_external_or_valid_url])
parent = models.ForeignKey(to='self',
verbose_name=_("Parent"),
null=True,
blank=True,
limit_choices_to={'parent': None},
on_delete=models.CASCADE)
visible = models.BooleanField(verbose_name=_("Public visible"),
help_text=_("Check to mark element as public visible"),
default=False)
position = models.SmallIntegerField(verbose_name=_("Position"), default=0)
objects = ElementQuerySet.as_manager()
class Meta:
verbose_name = _("Element")
verbose_name_plural = _("Elements")
ordering = ['position', ]
def __str__(self):
return self.name
def get_absolute_url(self):
return self.url
def is_external_url(self):
return is_external_url(self.url)
is_external_url.short_description = _('Is external URL?')
is_external_url.boolean = True