562 lines
18 KiB
Python
562 lines
18 KiB
Python
from __future__ import unicode_literals
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import datetime
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import itertools
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from django.core.exceptions import ValidationError
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from django.contrib.auth.models import User
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from django.db import models
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from django.db.models import F, Q
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from django.utils import timezone
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from django.utils.encoding import python_2_unicode_compatible
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from django.utils.translation import ugettext_lazy as _
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from model_utils.managers import InheritanceManager
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# User models
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@python_2_unicode_compatible
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class Attendee(models.Model):
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''' Miscellaneous user-related data. '''
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def __str__(self):
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return "%s" % self.user
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@staticmethod
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def get_instance(user):
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''' Returns the instance of attendee for the given user, or creates
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a new one. '''
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attendees = Attendee.objects.filter(user=user)
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if len(attendees) > 0:
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return attendees[0]
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else:
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attendee = Attendee(user=user)
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attendee.save()
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return attendee
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user = models.OneToOneField(User, on_delete=models.CASCADE)
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# Badge/profile is linked
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completed_registration = models.BooleanField(default=False)
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highest_complete_category = models.IntegerField(default=0)
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class AttendeeProfileBase(models.Model):
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''' Information for an attendee's badge and related preferences.
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Subclass this in your Django site to ask for attendee information in your
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registration progess.
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'''
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objects = InheritanceManager()
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@classmethod
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def name_field(cls):
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''' This is used to pre-fill the attendee's name from the
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speaker profile. If it's None, that functionality is disabled. '''
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return None
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attendee = models.OneToOneField(Attendee, on_delete=models.CASCADE)
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# Inventory Models
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@python_2_unicode_compatible
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class Category(models.Model):
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''' Registration product categories '''
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class Meta:
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verbose_name_plural = _("categories")
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def __str__(self):
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return self.name
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RENDER_TYPE_RADIO = 1
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RENDER_TYPE_QUANTITY = 2
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CATEGORY_RENDER_TYPES = [
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(RENDER_TYPE_RADIO, _("Radio button")),
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(RENDER_TYPE_QUANTITY, _("Quantity boxes")),
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]
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name = models.CharField(
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max_length=65,
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verbose_name=_("Name"),
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)
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description = models.CharField(
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max_length=255,
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verbose_name=_("Description"),
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)
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limit_per_user = models.PositiveIntegerField(
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null=True,
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blank=True,
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verbose_name=_("Limit per user"),
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help_text=_("The total number of items from this category one "
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"attendee may purchase."),
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)
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required = models.BooleanField(
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blank=True,
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help_text=_("If enabled, a user must select an "
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"item from this category."),
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)
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order = models.PositiveIntegerField(
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verbose_name=("Display order"),
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)
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render_type = models.IntegerField(
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choices=CATEGORY_RENDER_TYPES,
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verbose_name=_("Render type"),
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help_text=_("The registration form will render this category in this "
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"style."),
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)
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@python_2_unicode_compatible
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class Product(models.Model):
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''' Registration products '''
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def __str__(self):
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return "%s - %s" % (self.category.name, self.name)
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name = models.CharField(
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max_length=65,
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verbose_name=_("Name"),
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)
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description = models.CharField(
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max_length=255,
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verbose_name=_("Description"),
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null=True,
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blank=True,
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)
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category = models.ForeignKey(
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Category,
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verbose_name=_("Product category")
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)
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price = models.DecimalField(
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max_digits=8,
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decimal_places=2,
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verbose_name=_("Price"),
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)
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limit_per_user = models.PositiveIntegerField(
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null=True,
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blank=True,
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verbose_name=_("Limit per user"),
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)
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reservation_duration = models.DurationField(
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default=datetime.timedelta(hours=1),
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verbose_name=_("Reservation duration"),
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help_text=_("The length of time this product will be reserved before "
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"it is released for someone else to purchase."),
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)
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order = models.PositiveIntegerField(
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verbose_name=("Display order"),
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)
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@python_2_unicode_compatible
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class Voucher(models.Model):
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''' Registration vouchers '''
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# Vouchers reserve a cart for a fixed amount of time, so that
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# items may be added without the voucher being swiped by someone else
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RESERVATION_DURATION = datetime.timedelta(hours=1)
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def __str__(self):
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return "Voucher for %s" % self.recipient
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@classmethod
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def normalise_code(cls, code):
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return code.upper()
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def save(self, *a, **k):
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''' Normalise the voucher code to be uppercase '''
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self.code = self.normalise_code(self.code)
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super(Voucher, self).save(*a, **k)
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recipient = models.CharField(max_length=64, verbose_name=_("Recipient"))
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code = models.CharField(max_length=16,
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unique=True,
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verbose_name=_("Voucher code"))
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limit = models.PositiveIntegerField(verbose_name=_("Voucher use limit"))
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# Product Modifiers
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@python_2_unicode_compatible
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class DiscountBase(models.Model):
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''' Base class for discounts. Each subclass has controller code that
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determines whether or not the given discount is available to be added to
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the current cart. '''
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objects = InheritanceManager()
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def __str__(self):
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return "Discount: " + self.description
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def effects(self):
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''' Returns all of the effects of this discount. '''
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products = self.discountforproduct_set.all()
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categories = self.discountforcategory_set.all()
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return itertools.chain(products, categories)
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description = models.CharField(
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max_length=255,
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verbose_name=_("Description"),
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help_text=_("A description of this discount. This will be included on "
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"invoices where this discount is applied."),
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)
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@python_2_unicode_compatible
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class DiscountForProduct(models.Model):
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''' Represents a discount on an individual product. Each Discount can
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contain multiple products and categories. Discounts can either be a
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percentage or a fixed amount, but not both. '''
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def __str__(self):
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if self.percentage:
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return "%s%% off %s" % (self.percentage, self.product)
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elif self.price:
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return "$%s off %s" % (self.price, self.product)
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def clean(self):
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if self.percentage is None and self.price is None:
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raise ValidationError(
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_("Discount must have a percentage or a price."))
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elif self.percentage is not None and self.price is not None:
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raise ValidationError(
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_("Discount may only have a percentage or only a price."))
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prods = DiscountForProduct.objects.filter(
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discount=self.discount,
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product=self.product)
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cats = DiscountForCategory.objects.filter(
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discount=self.discount,
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category=self.product.category)
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if len(prods) > 1:
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raise ValidationError(
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_("You may only have one discount line per product"))
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if len(cats) != 0:
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raise ValidationError(
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_("You may only have one discount for "
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"a product or its category"))
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discount = models.ForeignKey(DiscountBase, on_delete=models.CASCADE)
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product = models.ForeignKey(Product, on_delete=models.CASCADE)
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percentage = models.DecimalField(
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max_digits=4, decimal_places=1, null=True, blank=True)
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price = models.DecimalField(
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max_digits=8, decimal_places=2, null=True, blank=True)
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quantity = models.PositiveIntegerField()
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@python_2_unicode_compatible
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class DiscountForCategory(models.Model):
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''' Represents a discount for a category of products. Each discount can
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contain multiple products. Category discounts can only be a percentage. '''
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def __str__(self):
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return "%s%% off %s" % (self.percentage, self.category)
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def clean(self):
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prods = DiscountForProduct.objects.filter(
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discount=self.discount,
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product__category=self.category)
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cats = DiscountForCategory.objects.filter(
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discount=self.discount,
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category=self.category)
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if len(prods) != 0:
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raise ValidationError(
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_("You may only have one discount for "
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"a product or its category"))
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if len(cats) > 1:
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raise ValidationError(
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_("You may only have one discount line per category"))
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discount = models.ForeignKey(DiscountBase, on_delete=models.CASCADE)
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category = models.ForeignKey(Category, on_delete=models.CASCADE)
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percentage = models.DecimalField(
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max_digits=4,
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decimal_places=1)
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quantity = models.PositiveIntegerField()
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class TimeOrStockLimitDiscount(DiscountBase):
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''' Discounts that are generally available, but are limited by timespan or
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usage count. This is for e.g. Early Bird discounts. '''
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class Meta:
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verbose_name = _("Promotional discount")
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start_time = models.DateTimeField(
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null=True,
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blank=True,
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verbose_name=_("Start time"),
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help_text=_("This discount will only be available after this time."),
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)
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end_time = models.DateTimeField(
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null=True,
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blank=True,
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verbose_name=_("End time"),
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help_text=_("This discount will only be available before this time."),
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)
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limit = models.PositiveIntegerField(
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null=True,
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blank=True,
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verbose_name=_("Limit"),
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help_text=_("This discount may only be applied this many times."),
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)
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class VoucherDiscount(DiscountBase):
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''' Discounts that are enabled when a voucher code is in the current
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cart. '''
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voucher = models.OneToOneField(
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Voucher,
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on_delete=models.CASCADE,
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verbose_name=_("Voucher"),
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)
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class IncludedProductDiscount(DiscountBase):
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''' Discounts that are enabled because another product has been purchased.
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e.g. A conference ticket includes a free t-shirt. '''
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class Meta:
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verbose_name = _("Product inclusion")
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enabling_products = models.ManyToManyField(
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Product,
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verbose_name=_("Including product"),
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help_text=_("If one of these products are purchased, the discounts "
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"below will be enabled."),
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)
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class RoleDiscount(object):
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''' Discounts that are enabled because the active user has a specific
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role. This is for e.g. volunteers who can get a discount ticket. '''
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# TODO: implement RoleDiscount
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pass
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@python_2_unicode_compatible
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class EnablingConditionBase(models.Model):
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''' This defines a condition which allows products or categories to
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be made visible. If there is at least one mandatory enabling condition
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defined on a Product or Category, it will only be enabled if *all*
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mandatory conditions are met, otherwise, if there is at least one enabling
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condition defined on a Product or Category, it will only be enabled if at
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least one condition is met. '''
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objects = InheritanceManager()
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def __str__(self):
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return self.description
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def effects(self):
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''' Returns all of the items enabled by this condition. '''
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return itertools.chain(self.products.all(), self.categories.all())
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description = models.CharField(max_length=255)
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mandatory = models.BooleanField(
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default=False,
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help_text=_("If there is at least one mandatory condition defined on "
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"a product or category, all such conditions must be met. "
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"Otherwise, at least one non-mandatory condition must be "
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"met."),
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)
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products = models.ManyToManyField(
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Product,
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blank=True,
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help_text=_("Products that are enabled if this condition is met."),
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)
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categories = models.ManyToManyField(
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Category,
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blank=True,
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help_text=_("Categories whose products are enabled if this condition "
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"is met."),
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)
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class TimeOrStockLimitEnablingCondition(EnablingConditionBase):
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''' Registration product ceilings '''
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class Meta:
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verbose_name = _("ceiling")
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start_time = models.DateTimeField(
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null=True,
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blank=True,
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help_text=_("Products included in this condition will only be "
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"available after this time."),
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)
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end_time = models.DateTimeField(
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null=True,
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blank=True,
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help_text=_("Products included in this condition will only be "
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"available before this time."),
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)
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limit = models.PositiveIntegerField(
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null=True,
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blank=True,
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help_text=_("The number of items under this grouping that can be "
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"purchased."),
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)
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@python_2_unicode_compatible
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class ProductEnablingCondition(EnablingConditionBase):
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''' The condition is met because a specific product is purchased. '''
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def __str__(self):
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return "Enabled by products: " + str(self.enabling_products.all())
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enabling_products = models.ManyToManyField(
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Product,
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help_text=_("If one of these products are purchased, this condition "
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"is met."),
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)
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@python_2_unicode_compatible
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class CategoryEnablingCondition(EnablingConditionBase):
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''' The condition is met because a product in a particular product is
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purchased. '''
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def __str__(self):
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return "Enabled by product in category: " + str(self.enabling_category)
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enabling_category = models.ForeignKey(
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Category,
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help_text=_("If a product from this category is purchased, this "
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"condition is met."),
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)
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@python_2_unicode_compatible
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class VoucherEnablingCondition(EnablingConditionBase):
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''' The condition is met because a Voucher is present. This is for e.g.
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enabling sponsor tickets. '''
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def __str__(self):
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return "Enabled by voucher: %s" % self.voucher
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voucher = models.OneToOneField(Voucher)
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# @python_2_unicode_compatible
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class RoleEnablingCondition(object):
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''' The condition is met because the active user has a particular Role.
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This is for e.g. enabling Team tickets. '''
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# TODO: implement RoleEnablingCondition
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pass
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# Commerce Models
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@python_2_unicode_compatible
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class Cart(models.Model):
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''' Represents a set of product items that have been purchased, or are
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pending purchase. '''
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def __str__(self):
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return "%d rev #%d" % (self.id, self.revision)
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user = models.ForeignKey(User)
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# ProductItems (foreign key)
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vouchers = models.ManyToManyField(Voucher, blank=True)
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time_last_updated = models.DateTimeField()
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reservation_duration = models.DurationField()
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revision = models.PositiveIntegerField(default=1)
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active = models.BooleanField(default=True)
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released = models.BooleanField(default=False) # Refunds etc
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@classmethod
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def reserved_carts(cls):
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''' Gets all carts that are 'reserved' '''
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return Cart.objects.filter(
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(Q(active=True) &
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Q(time_last_updated__gt=(
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timezone.now()-F('reservation_duration')
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))) |
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(Q(active=False) & Q(released=False))
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)
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@python_2_unicode_compatible
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class ProductItem(models.Model):
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''' Represents a product-quantity pair in a Cart. '''
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def __str__(self):
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return "product: %s * %d in Cart: %s" % (
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self.product, self.quantity, self.cart)
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cart = models.ForeignKey(Cart)
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product = models.ForeignKey(Product)
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quantity = models.PositiveIntegerField()
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@python_2_unicode_compatible
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class DiscountItem(models.Model):
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''' Represents a discount-product-quantity relation in a Cart. '''
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def __str__(self):
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return "%s: %s * %d in Cart: %s" % (
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self.discount, self.product, self.quantity, self.cart)
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cart = models.ForeignKey(Cart)
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product = models.ForeignKey(Product)
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discount = models.ForeignKey(DiscountBase)
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quantity = models.PositiveIntegerField()
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@python_2_unicode_compatible
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class Invoice(models.Model):
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''' An invoice. Invoices can be automatically generated when checking out
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a Cart, in which case, it is attached to a given revision of a Cart. '''
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def __str__(self):
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return "Invoice #%d" % self.id
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def clean(self):
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if self.cart is not None and self.cart_revision is None:
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raise ValidationError(
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"If this is a cart invoice, it must have a revision")
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# Invoice Number
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user = models.ForeignKey(User)
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cart = models.ForeignKey(Cart, null=True)
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cart_revision = models.IntegerField(null=True)
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# Line Items (foreign key)
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void = models.BooleanField(default=False)
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paid = models.BooleanField(default=False)
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value = models.DecimalField(max_digits=8, decimal_places=2)
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@python_2_unicode_compatible
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class LineItem(models.Model):
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''' Line items for an invoice. These are denormalised from the ProductItems
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and DiscountItems that belong to a cart (for consistency), but also allow
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for arbitrary line items when required. '''
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def __str__(self):
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return "Line: %s * %d @ %s" % (
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self.description, self.quantity, self.price)
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invoice = models.ForeignKey(Invoice)
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description = models.CharField(max_length=255)
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quantity = models.PositiveIntegerField()
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price = models.DecimalField(max_digits=8, decimal_places=2)
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@python_2_unicode_compatible
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class Payment(models.Model):
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''' A payment for an invoice. Each invoice can have multiple payments
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attached to it.'''
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def __str__(self):
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return "Payment: ref=%s amount=%s" % (self.reference, self.amount)
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invoice = models.ForeignKey(Invoice)
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time = models.DateTimeField(default=timezone.now)
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reference = models.CharField(max_length=64)
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amount = models.DecimalField(max_digits=8, decimal_places=2)
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