little performance tweaks

[bluechips.git] / bluechips / model / expenditure.py

diff --git a/bluechips/model/expenditure.py b/bluechips/model/expenditure.py
index 8d3bbbc67e74e9c8155df70bcf694e5788a629d4..9d0fc7e0f981ad2719f2435789199a934b5c5bca 100644 (file)
--- a/bluechips/model/expenditure.py
+++ b/bluechips/model/expenditure.py
@@ -84,6 +84,17 @@ class Expenditure(object):
         
         for user, share in amounts_dict.iteritems():
             s = Split(self, user, share)
-            meta.Session.save(s)
+            meta.Session.add(s)
+
+    def involves(self, user):
+        "Returns True if ``user`` is involved in this expenditure."
+        return any((split.user == user) and (split.share != 0)
+                   for split in self.splits)
+
+    def share(self, user):
+        "Return the share corresponding to ``user``."
+        shares = dict((split.user, split.share)
+                      for split in self.splits)
+        return shares.get(user, Currency(0))
 
 __all__ = ['Expenditure']