membersystem/membership/models.py

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from django.contrib.auth import get_user_model
from django.db import models
from django.utils.translation import gettext as _
from djmoney.models.fields import MoneyField
class CreatedModifiedAbstract(models.Model):
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modified = models.DateTimeField(auto_now=True, verbose_name=_("modified"))
created = models.DateTimeField(auto_now_add=True, verbose_name=_("created"))
class Meta:
abstract = True
class Organization(CreatedModifiedAbstract):
"""
This holds the data of the organization that someone is a member of. It is
possible that we'll create more advanced features here.
"""
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name = models.CharField(verbose_name=_("name"), max_length=64)
def __str__(self):
return self.name
class Meta:
verbose_name = _("organization")
verbose_name_plural = _("organizations")
class Membership(CreatedModifiedAbstract):
"""
A user remains a member of an organization even though the subscription is
unpaid or renewed. This just changes the status/permissions etc. of the
membership, thus we need to track subscription creation, expiry, renewals
etc. and ensure that the membership is modified accordingly.
This expresses some
"""
organization = models.ForeignKey(Organization, on_delete=models.PROTECT)
user = models.ForeignKey(get_user_model(), on_delete=models.PROTECT)
can_vote = models.BooleanField(
default=False,
verbose_name=_("can vote"),
help_text=_(
"Indicates that the user has a democratic membership of the "
"organization."
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),
)
def __str__(self):
return _("{} is a member of {}").format(
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self.user.get_full_name(), self.organization.name
)
class Meta:
verbose_name = _("membership")
verbose_name_plural = _("memberships")
class SubscriptionType(CreatedModifiedAbstract):
"""
Properties of subscriptions are stored here. Should of course not be edited
after subscriptions are created.
"""
organization = models.ForeignKey(Organization, on_delete=models.PROTECT)
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name = models.CharField(verbose_name=_("name"), max_length=64)
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fee = MoneyField(max_digits=16, decimal_places=2)
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fee_vat = MoneyField(max_digits=16, decimal_places=2, default=0)
duration = models.PositiveSmallIntegerField(
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default=1, choices=[(1, _("annual"))], verbose_name=_("duration")
)
class Meta:
verbose_name = _("subscription type")
verbose_name_plural = _("subscription types")
class Subscription(CreatedModifiedAbstract):
"""
To not confuse other types of subscriptions, one can be a *subscribed*
member of an organization, meaning that they are paying etc.
A subscription does not track payment, this is done in the accounting app.
"""
subscription_type = models.ForeignKey(
SubscriptionType,
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related_name="memberships",
verbose_name=_("subscription type"),
on_delete=models.PROTECT,
)
user = models.ForeignKey(get_user_model(), on_delete=models.PROTECT)
active = models.BooleanField(
default=False,
verbose_name=_("active"),
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help_text=_("Automatically set by payment system."),
)
starts = models.DateField()
ends = models.DateField()
renewed_subscription = models.ForeignKey(
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"self",
null=True,
blank=True,
verbose_name=_("renewed subscription"),
on_delete=models.PROTECT,
)
class Meta:
verbose_name = _("subscription")
verbose_name_plural = _("subscriptions")