74 lines
2.2 KiB
Python
74 lines
2.2 KiB
Python
import itertools
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from django.db.models import Sum
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from registrasion import models as rego
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from category import CategoryController
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from conditions import ConditionController
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class ProductController(object):
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def __init__(self, product):
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self.product = product
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@classmethod
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def available_products(cls, user, category=None, products=None):
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''' Returns a list of all of the products that are available per
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enabling conditions from the given categories.
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TODO: refactor so that all conditions are tested here and
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can_add_with_enabling_conditions calls this method. '''
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if category is None and products is None:
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raise ValueError("You must provide products or a category")
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if category is not None:
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all_products = rego.Product.objects.filter(category=category)
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else:
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all_products = []
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if products is not None:
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all_products = itertools.chain(all_products, products)
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passed_limits = set(
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product
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for product in all_products
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if CategoryController(product.category).user_quantity_remaining(
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user
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) > 0
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if cls(product).user_quantity_remaining(user) > 0
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)
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failed_and_messages = ConditionController.test_enabling_conditions(
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user, products=passed_limits
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)
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failed_conditions = set(i[0] for i in failed_and_messages)
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out = list(passed_limits - failed_conditions)
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out.sort(key=lambda product: product.order)
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return out
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def user_quantity_remaining(self, user):
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''' Returns the quantity of this product that the user add in the
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current cart. '''
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prod_limit = self.product.limit_per_user
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if prod_limit is None:
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# Don't need to run the remaining queries
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return 999999 # We can do better
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carts = rego.Cart.objects.filter(
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user=user,
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active=False,
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released=False,
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)
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items = rego.ProductItem.objects.filter(
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cart__in=carts,
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product=self.product,
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)
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prod_count = items.aggregate(Sum("quantity"))["quantity__sum"] or 0
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return prod_limit - prod_count
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