django-orchestra/orchestra/contrib/plans/models.py

102 lines
3.6 KiB
Python

from django.core.validators import ValidationError
from django.db import models
from django.db.models import Q
from django.utils.functional import cached_property
from django.utils.translation import ugettext_lazy as _
from orchestra.core.validators import validate_name
from orchestra.models import queryset
from orchestra.utils.functional import cached
from orchestra.utils.python import import_class
from . import settings
class Plan(models.Model):
name = models.CharField(_("name"), max_length=32, unique=True, validators=[validate_name])
verbose_name = models.CharField(_("verbose_name"), max_length=128, blank=True)
is_active = models.BooleanField(_("active"), default=True,
help_text=_("Designates whether this account should be treated as active. "
"Unselect this instead of deleting accounts."))
is_default = models.BooleanField(_("default"), default=False,
help_text=_("Designates whether this plan is used by default or not."))
is_combinable = models.BooleanField(_("combinable"), default=True,
help_text=_("Designates whether this plan can be combined with other plans or not."))
allow_multiple = models.BooleanField(_("allow multiple"), default=False,
help_text=_("Designates whether this plan allow for multiple contractions."))
def __str__(self):
return self.get_verbose_name()
def clean(self):
self.verbose_name = self.verbose_name.strip()
def get_verbose_name(self):
return self.verbose_name or self.name
class ContractedPlan(models.Model):
plan = models.ForeignKey(Plan, verbose_name=_("plan"), related_name='contracts')
account = models.ForeignKey('accounts.Account', verbose_name=_("account"),
related_name='plans')
class Meta:
verbose_name_plural = _("plans")
def __str__(self):
return str(self.plan)
@cached_property
def active(self):
return self.plan.is_active and self.account.is_active
def clean(self):
if not self.pk and not self.plan.allow_multiple:
if ContractedPlan.objects.filter(plan=self.plan, account=self.account).exists():
raise ValidationError("A contracted plan for this account already exists.")
class RateQuerySet(models.QuerySet):
group_by = queryset.group_by
def by_account(self, account):
# Default allways selected
return self.filter(
Q(plan__is_default=True) |
Q(plan__contracts__account=account)
).order_by('plan', 'quantity').select_related('plan', 'service')
class Rate(models.Model):
service = models.ForeignKey('services.Service', verbose_name=_("service"),
related_name='rates')
plan = models.ForeignKey(Plan, verbose_name=_("plan"), related_name='rates')
quantity = models.PositiveIntegerField(_("quantity"), null=True, blank=True,
help_text=_("See rate algorihm help text."))
price = models.DecimalField(_("price"), max_digits=12, decimal_places=2)
objects = RateQuerySet.as_manager()
class Meta:
unique_together = ('service', 'plan', 'quantity')
def __str__(self):
return "{}-{}".format(str(self.price), self.quantity)
@classmethod
@cached
def get_methods(cls):
return dict((method, import_class(method)) for method in settings.PLANS_RATE_METHODS)
@classmethod
@cached
def get_choices(cls):
choices = []
for name, method in cls.get_methods().items():
choices.append((name, method.verbose_name))
return choices
@classmethod
def get_default(cls):
return settings.PLANS_DEFAULT_RATE_METHOD