symposion_app/registrasion/controllers/product.py

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from django.db.models import Q
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from registrasion import models as rego
from conditions import ConditionController
class ProductController(object):
def __init__(self, product):
self.product = product
def user_can_add_within_limit(self, user, quantity):
''' Return true if the user is able to add _quantity_ to their count of
this Product without exceeding _limit_per_user_.'''
carts = rego.Cart.objects.filter(user=user)
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items = rego.ProductItem.objects.filter(
product=self.product,
cart=carts)
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count = 0
for item in items:
count += item.quantity
if quantity + count > self.product.limit_per_user:
return False
else:
return True
def can_add_with_enabling_conditions(self, user, quantity):
''' Returns true if the user is able to add _quantity_ to their count
of this Product without exceeding the ceilings the product is attached
to. '''
conditions = rego.EnablingConditionBase.objects.filter(
Q(products=self.product) | Q(categories=self.product.category)
).select_subclasses()
mandatory_violated = False
non_mandatory_met = False
for condition in conditions:
cond = ConditionController.for_condition(condition)
met = cond.is_met(user, quantity)
if condition.mandatory and not met:
mandatory_violated = True
break
if met:
non_mandatory_met = True
if mandatory_violated:
# All mandatory conditions must be met
return False
if len(conditions) > 0 and not non_mandatory_met:
# If there's any non-mandatory conditions, one must be met
return False
return True