symposion_app Changeset - 3b5b958b78b6

Changeset - 3b5b958b78b6

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Christopher Neugebauer - 8 years ago 2016-04-29 01:09:08
chrisjrn@gmail.com

Makes the discounts section from _handle_products evaluate lazily, just in case it’s never displayed in a template (those are some very very expensive queries there).

2 files changed with 35 insertions and 1 deletions:

registrasion/util.py

registrasion/views.py

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registrasion/util.py

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@@ ... / @@ -25,3 +25,33 @@ def all_arguments_optional(ntcls): @@
+    )
     return ntcls
 def lazy(function, *args, **kwargs):
     ''' Produces a callable so that functions can be lazily evaluated in
     templates.
     Arguments:
         function (callable): The function to call at evaluation time.
         args: Positional arguments, passed directly to ``function``.
         kwargs: Keyword arguments, passed directly to ``function``.
     Return:
         callable: A callable that will evaluate a call to ``function`` with
             the specified arguments.
     '''
     NOT_EVALUATED = object()
     retval = [NOT_EVALUATED]
     def evaluate():
         if retval[0] is NOT_EVALUATED:
             retval[0] = function(*args, **kwargs)
         return retval[0]
     return evaluate

registrasion/views.py

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@@ ... / @@ -429,7 +429,11 @@ def _handle_products(request, category, products, prefix): @@
+                )
     handled = False if products_form.errors else True
     discounts = DiscountController.available_discounts(
     # Making this a function to lazily evaluate when it's displayed
     # in templates.
     discounts = util.lazy(
         DiscountController.available_discounts,
         request.user,
         [],
         products,

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