Stop causing an infinite loop on _getBaseUnitPrice.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@32402 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Amount.py

@@ -37,12 +37,11 @@ from Products.ERP5Type import Permissions, PropertySheet, Constraint, interfaces
 from Products.ERP5Type.Base import Base
 from Products.ERP5Type.Base import TempBase
 from Products.CMFCategory.Renderer import Renderer
-
+from Products.ERP5Type.TransactionalVariable import getTransactionalVariable
 
 from zLOG import LOG, ERROR
 from warnings import warn
 
-
 class Amount(Base, Variated):
   """
     A mix-in class which provides some utilities
@@ -420,12 +419,23 @@ class Amount(Base, Variated):
       return quantity * price
 
   def _getBaseUnitPrice(self, context):
+    # Stop any recursive call to this method. This happens when a Path
+    # does not have base unit price locally, so it looks it up, and
+    # each path of a predicate list does the same again.
+    tv = getTransactionalVariable(self)
+    key = '_getBaseUnitPrice'
+    if key in tv:
+      return
+    tv[key] = 1
+    try:
       resource = self.getResourceValue()
       if resource is not None:
         operand_dict = resource.getPriceParameterDict(context=context)
         if operand_dict is not None:
           base_unit_price = operand_dict.get('base_unit_price', None)
           return base_unit_price
+    finally:
+      del tv[key]
 
   security.declareProtected(Permissions.AccessContentsInformation, 'getBaseUnitPrice')
   def getBaseUnitPrice(self, **kw):