Source code for oscar.apps.partner.abstract_models

from decimal import Decimal as D
import warnings

from django.db import models
from django.conf import settings
from django.db.models import get_model
from django.utils.translation import ugettext_lazy as _
from django.utils.importlib import import_module as django_import_module
from oscar.core.compat import AUTH_USER_MODEL

from oscar.core.utils import slugify
from oscar.core.loading import get_class
from oscar.apps.partner.exceptions import InvalidStockAdjustment
DefaultWrapper = get_class('partner.wrappers', 'DefaultWrapper')


# Cache dict of partner_id => availability wrapper instance
partner_wrappers = None

default_wrapper = DefaultWrapper()


[docs]def get_partner_wrapper(partner_id): """ Returns the appropriate partner wrapper given the partner's PK """ if partner_wrappers is None: _load_partner_wrappers() return partner_wrappers.get(partner_id, default_wrapper)
def _load_partner_wrappers(): # Prime cache of partner wrapper dict global partner_wrappers partner_wrappers = {} Partner = get_model('partner', 'Partner') for code, class_str in settings.OSCAR_PARTNER_WRAPPERS.items(): try: partner = Partner.objects.get(code=code) except Partner.DoesNotExist: continue else: module_path, klass = class_str.rsplit('.', 1) module = django_import_module(module_path) partner_wrappers[partner.id] = getattr(module, klass)()
[docs]class AbstractPartner(models.Model): """ A fulfillment partner. An individual or company who can fulfil products. E.g. for physical goods, somebody with a warehouse and means of delivery. Creating one or more instances of the Partner model is a required step in setting up an Oscar deployment. Many Oscar deployments will only have one fulfillment partner. """ code = models.SlugField(_("Code"), max_length=128, unique=True) name = models.CharField(_("Name"), max_length=128, null=True, blank=True) #: A partner can have users assigned to it. This is used #: for access modelling in the permission-based dashboard users = models.ManyToManyField( AUTH_USER_MODEL, related_name="partners", blank=True, null=True, verbose_name=_("Users")) @property def display_name(self): if not self.name: return self.code return self.name def save(self, *args, **kwargs): if not self.code: self.code = slugify(self.name) super(AbstractPartner, self).save(*args, **kwargs) @property
[docs] def primary_address(self): """ Returns a partners primary address. Usually that will be the headquarters or similar. This is a rudimentary implementation that raises an error if there's more than one address. If you actually want to support multiple addresses, you will likely need to extend PartnerAddress to have some field or flag to base your decision on. """ addresses = self.addresses.all() if len(addresses) == 0: # intentionally using len() to save queries return None elif len(addresses) == 1: return addresses[0] else: raise NotImplementedError( "Oscar's default implementation of primary_address only " "supports one PartnerAddress. You need to override the " "primary_address to look up the right address")
[docs] def get_address_for_stockrecord(self, stockrecord): """ Stock might be coming from different warehouses. Overriding this function allows selecting the correct PartnerAddress for the record. That can be useful when determining tax. """ return self.primary_address
class Meta: permissions = (('dashboard_access', _('Can access dashboard')), ) verbose_name = _('Fulfillment partner') verbose_name_plural = _('Fulfillment partners') abstract = True def __unicode__(self): return self.name
[docs]class AbstractStockRecord(models.Model): """ A stock record. This records information about a product from a fulfilment partner, such as their SKU, the number they have in stock and price information. Stockrecords are used by 'strategies' to determine availability and pricing information for the customer. """ product = models.ForeignKey( 'catalogue.Product', related_name="stockrecords", verbose_name=_("Product")) partner = models.ForeignKey( 'partner.Partner', verbose_name=_("Partner"), related_name='stockrecords') #: The fulfilment partner will often have their own SKU for a product, #: which we store here. This will sometimes be the same the product's UPC #: but not always. It should be unique per partner. #: See also http://en.wikipedia.org/wiki/Stock-keeping_unit partner_sku = models.CharField(_("Partner SKU"), max_length=128) # Price info: price_currency = models.CharField( _("Currency"), max_length=12, default=settings.OSCAR_DEFAULT_CURRENCY) # This is the base price for calculations - tax should be applied by the # appropriate method. We don't store tax here as its calculation is highly # domain-specific. It is NULLable because some items don't have a fixed # price but require a runtime calculation (possible from an external # service). price_excl_tax = models.DecimalField( _("Price (excl. tax)"), decimal_places=2, max_digits=12, blank=True, null=True) #: Retail price for this item. This is simply the recommended price from #: the manufacturer. If this is used, it is for display purposes only. #: This prices is the NOT the price charged to the customer. price_retail = models.DecimalField( _("Price (retail)"), decimal_places=2, max_digits=12, blank=True, null=True) #: Cost price is the price charged by the fulfilment partner. It is not #: used (by default) in any price calculations but is often used in #: reporting so merchants can report on their profit margin. cost_price = models.DecimalField( _("Cost Price"), decimal_places=2, max_digits=12, blank=True, null=True) #: Number of items in stock num_in_stock = models.PositiveIntegerField( _("Number in stock"), blank=True, null=True) #: The amount of stock allocated to orders but not fed back to the master #: stock system. A typical stock update process will set the num_in_stock #: variable to a new value and reset num_allocated to zero num_allocated = models.IntegerField( _("Number allocated"), blank=True, null=True) #: Threshold for low-stock alerts. When stock goes beneath this threshold, #: an alert is triggered so warehouse managers can order more. low_stock_threshold = models.PositiveIntegerField( _("Low Stock Threshold"), blank=True, null=True) # Date information date_created = models.DateTimeField(_("Date created"), auto_now_add=True) date_updated = models.DateTimeField(_("Date updated"), auto_now=True, db_index=True) def __unicode__(self): msg = u"Partner: %s, product: %s" % ( self.partner.display_name, self.product,) if self.partner_sku: msg = u"%s (%s)" % (msg, self.partner_sku) return msg class Meta: abstract = True unique_together = ('partner', 'partner_sku') verbose_name = _("Stock record") verbose_name_plural = _("Stock records") @property
[docs] def net_stock_level(self): """ The effective number in stock (eg available to buy). This is correct property to show the customer, not the num_in_stock field as that doesn't account for allocations. This can be negative in some unusual circumstances """ if self.num_in_stock is None: return 0 if self.num_allocated is None: return self.num_in_stock return self.num_in_stock - self.num_allocated # 2-stage stock management model
[docs] def allocate(self, quantity): """ Record a stock allocation. This normally happens when a product is bought at checkout. When the product is actually shipped, then we 'consume' the allocation. """ if self.num_allocated is None: self.num_allocated = 0 self.num_allocated += quantity self.save()
allocate.alters_data = True
[docs] def is_allocation_consumption_possible(self, quantity): """ Test if a proposed stock consumption is permitted """ return quantity <= min(self.num_allocated, self.num_in_stock)
[docs] def consume_allocation(self, quantity): """ Consume a previous allocation This is used when an item is shipped. We remove the original allocation and adjust the number in stock accordingly """ if not self.is_allocation_consumption_possible(quantity): raise InvalidStockAdjustment( _('Invalid stock consumption request')) self.num_allocated -= quantity self.num_in_stock -= quantity self.save()
consume_allocation.alters_data = True def cancel_allocation(self, quantity): # We ignore requests that request a cancellation of more than the # amount already allocated. self.num_allocated -= min(self.num_allocated, quantity) self.save() cancel_allocation.alters_data = True @property def is_below_threshold(self): if self.low_stock_threshold is None: return False return self.net_stock_level < self.low_stock_threshold # Stock wrapper methods - deprecated since 0.6 @property
[docs] def is_available_to_buy(self): """ Return whether this stockrecord allows the product to be purchased """ warnings.warn(( "StockRecord.is_available_to_buy is deprecated and will be " "removed in 0.7. Use a strategy class to determine availability " "instead"), DeprecationWarning) return get_partner_wrapper(self.partner_id).is_available_to_buy(self)
[docs] def is_purchase_permitted(self, user=None, quantity=1, product=None): """ Return whether this stockrecord allows the product to be purchased by a specific user and quantity """ warnings.warn(( "StockRecord.is_purchase_permitted is deprecated and will be " "removed in 0.7. Use a strategy class to determine availability " "instead"), DeprecationWarning) return get_partner_wrapper( self.partner_id).is_purchase_permitted(self, user, quantity, product)
@property
[docs] def availability_code(self): """ Return an product's availability as a code for use in CSS to add icons to the overall availability mark-up. For example, "instock", "unavailable". """ warnings.warn(( "StockRecord.availability_code is deprecated and will be " "removed in 0.7. Use a strategy class to determine availability " "instead"), DeprecationWarning) return get_partner_wrapper(self.partner_id).availability_code(self)
@property
[docs] def availability(self): """ Return a product's availability as a string that can be displayed to the user. For example, "In stock", "Unavailable". """ warnings.warn(( "StockRecord.availability is deprecated and will be " "removed in 0.7. Use a strategy class to determine availability " "instead"), DeprecationWarning) return get_partner_wrapper(self.partner_id).availability(self)
[docs] def max_purchase_quantity(self, user=None): """ Return an item's availability as a string :param user: (optional) The user who wants to purchase """ warnings.warn(( "StockRecord.max_purchase_quantity is deprecated and will be " "removed in 0.7. Use a strategy class to determine availability " "instead"), DeprecationWarning) return get_partner_wrapper( self.partner_id).max_purchase_quantity(self, user)
@property
[docs] def dispatch_date(self): """ Return the estimated dispatch date for a line """ warnings.warn(( "StockRecord.dispatch_date is deprecated and will be " "removed in 0.7. Use a strategy class to determine availability " "instead"), DeprecationWarning) return get_partner_wrapper(self.partner_id).dispatch_date(self)
@property def lead_time(self): warnings.warn(( "StockRecord.lead_time is deprecated and will be " "removed in 0.7. Use a strategy class to determine availability " "instead"), DeprecationWarning) return get_partner_wrapper(self.partner_id).lead_time(self) # Price methods - deprecated in 0.6 @property
[docs] def price_incl_tax(self): """ Return a product's price including tax. This defaults to the price_excl_tax as tax calculations are domain specific. This class needs to be subclassed and tax logic added to this method. """ warnings.warn(( "StockRecord.price_incl_tax is deprecated and will be " "removed in 0.7. Use a strategy class to determine price " "information instead"), DeprecationWarning, stacklevel=2) if self.price_excl_tax is None: return D('0.00') return self.price_excl_tax + self.price_tax
@property
[docs] def price_tax(self): """ Return a product's tax value """ warnings.warn(( "StockRecord.price_incl_tax is deprecated and will be " "removed in 0.7. Use a strategy class to determine price " "information instead"), DeprecationWarning) return get_partner_wrapper(self.partner_id).calculate_tax(self)
[docs]class AbstractStockAlert(models.Model): """ A stock alert. E.g. used to notify users when a product is 'back in stock'. """ stockrecord = models.ForeignKey( 'partner.StockRecord', related_name='alerts', verbose_name=_("Stock Record")) threshold = models.PositiveIntegerField(_("Threshold")) OPEN, CLOSED = "Open", "Closed" status_choices = ( (OPEN, _("Open")), (CLOSED, _("Closed")), ) status = models.CharField(_("Status"), max_length=128, default=OPEN, choices=status_choices) date_created = models.DateTimeField(_("Date Created"), auto_now_add=True) date_closed = models.DateTimeField(_("Date Closed"), blank=True, null=True) def close(self): self.status = self.CLOSED self.save() close.alters_data = True def __unicode__(self): return _('<stockalert for "%(stock)s" status %(status)s>') \ % {'stock': self.stockrecord, 'status': self.status} class Meta: abstract = True ordering = ('-date_created',) verbose_name = _('Stock Alert') verbose_name_plural = _('Stock Alerts')