58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
from registrasion.models import commerce
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from registrasion.models import inventory
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from django.db.models import Sum
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class AllProducts(object):
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pass
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class CategoryController(object):
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def __init__(self, category):
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self.category = category
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@classmethod
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def available_categories(cls, user, products=AllProducts):
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''' Returns the categories available to the user. Specify `products` if
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you want to restrict to just the categories that hold the specified
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products, otherwise it'll do all. '''
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# STOPGAP -- this needs to be elsewhere tbqh
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from product import ProductController
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if products is AllProducts:
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products = inventory.Product.objects.all().select_related(
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"category",
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)
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available = ProductController.available_products(
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user,
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products=products,
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)
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return set(i.category for i in available)
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def user_quantity_remaining(self, user):
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''' Returns the number of items from this category that the user may
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add in the current cart. '''
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cat_limit = self.category.limit_per_user
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if cat_limit is None:
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# We don't need to waste the following queries
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return 99999999
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carts = commerce.Cart.objects.filter(
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user=user,
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status=commerce.Cart.STATUS_PAID,
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)
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items = commerce.ProductItem.objects.filter(
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cart__in=carts,
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product__category=self.category,
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)
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cat_count = items.aggregate(Sum("quantity"))["quantity__sum"] or 0
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return cat_limit - cat_count
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