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