Add debug logging for product availability checks

vendor/registrasion/registrasion/controllers/product.py

@@ -1,4 +1,5 @@
 import itertools
+import logging
 
 from django.db.models import Case
 from django.db.models import F, Q
@@ -23,6 +24,9 @@ class ProductController(object):
     def available_products(cls, user, category=None, products=None):
         ''' Returns a list of all of the products that are available per
         flag conditions from the given categories. '''
+        logging.debug("Checking available products for user %(user)s: "
+                      "category %(category)s or products %(product)s",
+                      {'user': user, 'category': category, 'products': products})
         if category is None and products is None:
             raise ValueError("You must provide products or a category")
 
@@ -45,14 +49,20 @@ class ProductController(object):
             if product_remainders[product.id] > 0
         )
 
+        logging.debug("Passed limits: %s", passed_limits)
+
         failed_and_messages = FlagController.test_flags(
             user, products=passed_limits
         )
         failed_conditions = set(i[0] for i in failed_and_messages)
 
+        logging.debug("Failed conditions: %s", failed_conditions)
+
         out = list(passed_limits - failed_conditions)
         out.sort(key=lambda product: product.order)
 
+        logging.debug("Returning: %s", out)
+
         return out
 
     @classmethod