class Product(ProductCommonInfoModel):
objects = ProductQuerySet.as_manager()
price = fields.FloatField(validators=[MinValueValidator(0)], )
quantity = fields.IntegerField(validators=[MinValueValidator(0)], )
sold_quantity = fields.IntegerField(validators=[MinValueValidator(0)], )
category = fields.ForeignKey(
Category,
verbose_name='Product category',
on_delete=models.SET_NULL,
null=True,
blank=True,
)
gender = fields.ForeignKey(
Gender,
verbose_name='Product gender',
on_delete=models.SET_NULL,
null=True,
blank=True,
)
base_colour = fields.ForeignKey(
BaseColour,
verbose_name='Product base colour',
on_delete=models.SET_NULL,
null=True,
blank=True,
)
season = fields.ForeignKey(
Season,
verbose_name='Season',
on_delete=models.SET_NULL,
null=True,
blank=True,
)
usage = fields.ForeignKey(
Usage,
verbose_name='Product usage',
on_delete=models.SET_NULL,
null=True,
blank=True,
)
article_type = fields.ForeignKey(
ArticleType,
verbose_name='Article type',
on_delete=models.SET_NULL,
null=True,
blank=True,
)
is_published = fields.BooleanField(
default=False,
help_text='This is a flag which is used to determine that product is'
'published or not. `False`: not published; otherwise, `True`.')
def __str__(self):
return super().__str__()
class MembershipLevel(ContributorModel):
"""
MembershipLevel model
"""
objects = MembershipLevelQuerySet.as_manager()
previous = fields.ForeignKey(
'self',
on_delete=models.SET_NULL,
related_name='level_previous',
null=True,
blank=True,
)
next = fields.ForeignKey(
'self',
on_delete=models.SET_NULL,
related_name='level_next',
null=True,
blank=True,
)
name = fields.ShortNameField(
null=False,
blank=False,
unique=True,
)
require_point = fields.IntegerField(
default=0,
validators=[MinValueValidator(0)],
help_text='Require point to reach the membership level.')
earning_point_rate = fields.FloatField(
default=1,
validators=[MinValueValidator(0),
MaxValueValidator(1)],
help_text='The rate to calculate the earning point for customer based'
'on the total amount on the bill.',
)
burning_point_rate = fields.FloatField(
default=1,
validators=[MinValueValidator(0),
MaxValueValidator(1)],
help_text='The rate to calculate amount when customer uses point to'
'redeem products.',
)
class Transaction(ContributorModel):
"""
Transaction model
"""
objects = TransactionQuerySet.as_manager()
order = fields.OneToOneField(
Order,
on_delete=models.CASCADE,
help_text='The order which transaction belong to',
)
user = fields.ForeignKey(
'accounts.User',
on_delete=models.CASCADE,
help_text='The user who own this transaction',
)
coupon = fields.ForeignKey(
Coupon,
on_delete=models.CASCADE,
null=True,
blank=True,
)
total_amount = fields.FloatField(
default=0,
validators=[MinValueValidator(0)],
help_text='Total amount of an order',
)
total_pay_amount = fields.FloatField(
default=0,
validators=[MinValueValidator(0)],
help_text='The actual amount that customer need to pay',
)
earning_point = fields.IntegerField(
validators=[MinValueValidator(0)],
default=0,
help_text='Number of point of an order that customer earns',
)
burning_point = fields.IntegerField(
validators=[MinValueValidator(0)],
default=0,
help_text='Number of point that customer spend to redeem product',
)
class Coupon(ContributorModel):
"""
Coupon model.
"""
objects = CouponQuerySet.as_manager()
reward = fields.ForeignKey(
'Reward',
on_delete=models.CASCADE,
help_text='The reward that coupon belong to',
)
kind = fields.IntegerField(
verbose_name='Coupon kind',
choices=CouponKindsEnum.to_tuple(),
default=CouponKindsEnum.PERCENTAGE.value,
)
code = fields.CharField(
verbose_name='Reward unique coupon code',
max_length=10,
unique=True,
)
start_date = models.DateTimeField(
verbose_name='Valid date time',
null=True,
blank=True,
)
end_date = models.DateTimeField(
verbose_name='Expire date time',
null=True,
blank=True,
)
amount = fields.FloatField(
help_text='Depend on coupon kind. If coupon kind is percentage coupon, '
'its value must be between 0 to 100. If coupon kind is money,'
'its value must be greater than 0',
validators=[MinValueValidator(0)],
)
target_amount = fields.FloatField(
help_text='How much need to be bought to use coupon.',
validators=[MinValueValidator(0)],
)
is_minimum_purchase = fields.BooleanField(
default=True,
help_text='This flag is used to determine when customer can use coupon.'
'`True`: Coupon can be used when total amount on bill is '
'greater than or equal `target amount`.'
'`False`: Coupon can be used when total amount on bill is'
'less than target amount.',
)
is_one_time_using = fields.BooleanField(
default=True,
help_text='True if coupon is allowed one time using, '
'`False` if it can be used all times.',
)
can_by_any_product = fields.BooleanField(
default=False,
help_text='`True`: coupon can buy any product. '
'`False`: coupon can buy products in the allowed list only.',
)
is_active = fields.BooleanField(
default=True,
help_text='`True` if coupon is active; otherwise, `False`.',
)
is_expired = fields.BooleanField(
default=False,
help_text='`True` if coupon is expired; otherwise, `False`.',
)
def __str__(self):
return f'coupon:{self.id}'
def save(self, **kwargs):
if not self.code:
self.code = uuid.uuid4()
super().save(**kwargs)
class Order(ContributorModel):
"""
Order model
"""
objects = OrderQuerySet.as_manager()
user = fields.ForeignKey(
'accounts.User',
on_delete=models.CASCADE,
help_text='The owner of the order',
)
status = fields.IntegerField(
choices=OrderStatusesEnum.to_tuple(),
default=OrderStatusesEnum.SHOPPING.value,
help_text='The order status',
)
total_amount = fields.FloatField(
default=0,
validators=[MinValueValidator(0)],
help_text='Total amount before applying coupon and points',
)
shipping_address = fields.ForeignKey(
AddressBook,
on_delete=models.SET_NULL,
null=True,
default=None,
help_text='The shipping address',
)
coupon = fields.ForeignKey(
Coupon,
on_delete=models.SET_NULL,
null=True,
default=None,
help_text='The coupon',
)
burning_point = fields.IntegerField(
default=0,
help_text='Number of points which used to redeem products',
)
@property
def total_pay_amount(self) -> float:
"""
Calculate the total payment amount
@return: Total payment amount
"""
if self.burning_point:
customer_obj = Customer.objects.get(account=self.user)
burning_point_rate = customer_obj.membership.level.\
burning_point_rate
return self.total_amount - burning_point_rate * self.burning_point
else:
return self.total_amount
@property
def num_of_items(self) -> int:
"""
Number of items in the cart
@return: The number of order/cart items
"""
return OrderItem.objects.non_archived_only().\
filter(order=self.id).count()
def __str__(self):
return f'order-{self.id}'
def clean(self):
"""
Don't allow `total_pay_amount` greater than `total_amount`
"""
if self.total_amount < self.total_pay_amount:
total_amount_msg = '`total_amount` must be greater ' \
'than or equal `total_pay_amount`'
total_pay_amount_msg = '`total_pay_amount` must be less ' \
'than or equal `total_amount`'
raise ValidationError({
'total_pay_amount':
ValidationError(_(total_pay_amount_msg)),
'total_amount':
ValidationError(_(total_amount_msg))
})
def save(self, **kwargs):
"""
Save an order and auto create transaction based on the order status.
If order is paid, transaction is created if not existed.
Otherwise, just save order only
TODO: Need to calculate total pay amount when applying coupon.
Temporary skip this task.
"""
try:
# If order status is not paid status. Just save and by pass.
if self.status is not OrderStatusesEnum.PAID.value:
super(Order, self).save(**kwargs)
return
self._create_transaction(**kwargs)
except Exception as e:
raise e
def _create_transaction(self, **kwargs):
"""
Auto create a transaction if the order status is paid
"""
# Get customer info who has this order
membership_level = None
customer_obj = Customer.objects.get(account=self.user)
if customer_obj and customer_obj.membership:
membership_level = customer_obj.membership.level
earning_point_rate = membership_level.earning_point_rate \
if membership_level else 0
earning_point = int(self.total_pay_amount * earning_point_rate)
transaction_data = {
'order': self,
'user': self.user,
'total_amount': self.total_amount,
'total_pay_amount': self.total_pay_amount,
'earning_point': earning_point,
'created_by': self.last_modified_by,
'last_modified_by': self.last_modified_by,
}
# Update earning point for customer.
customer_obj.total_earned_point += earning_point
customer_obj.available_point += earning_point
customer_obj.save()
# If order status is paid status, check and create transaction.
if self.pk is None:
super(Order, self).save(**kwargs)
Transaction.objects.create(**transaction_data)
else:
old_instance = Order.objects.get(pk=self.pk)
super(Order, self).save(**kwargs)
transaction = Transaction.objects.filter(order=self)
if old_instance.status is not OrderStatusesEnum.PAID.value \
and len(transaction) == 0:
Transaction.objects.create(**transaction_data)
class OrderItem(ContributorModel):
"""
Order Item model
"""
objects = OrderItemQuerySet.as_manager()
order = fields.ForeignKey(
Order,
on_delete=models.CASCADE,
)
product = fields.ForeignKey(
Product,
on_delete=models.CASCADE,
)
quantity = fields.IntegerField(validators=[MinValueValidator(1)], )
copy_price = fields.FloatField(
default=0,
null=True,
)
@property
def price(self):
if not self.copy_price:
self.copy_price = self.product.price
return self.copy_price
@property
def amount(self):
return self.price * self.quantity
def __str__(self):
return f'order-item-{self.id}'
def delete(self, using=None, keep_parents=False):
"""
Delete an order item and update the order information.
"""
try:
super(OrderItem, self).delete(using, keep_parents)
self.order.total_amount = models.F('total_amount') - self.amount
self.order.save()
except Exception as e:
raise e
def save(self, **kwargs):
"""
Save an order item and update the order information.
"""
try:
if self.pk is None:
super(OrderItem, self).save(**kwargs)
self.order.total_amount += self.amount
self.order.save()
else:
old_order_item = OrderItem.objects.get(pk=self.pk)
super(OrderItem, self).save(**kwargs)
if old_order_item.amount is not self.amount:
self.order.total_amount = self.order.total_amount - \
old_order_item.amount + \
self.amount
self.order.save()
except Exception as e:
raise e