Added an API to create a default price calculation context to computer price.

Added comments about mixup of kw params in Price API.

product/ERP5/Document/Resource.py

@@ -650,6 +650,15 @@ class Resource(XMLObject, XMLMatrix, VariatedMixin):
         return -1 # a defines a destination section and wins
       return 1 # a defines no destination section and loses
 
+    def _getPriceCalculationContext(self):
+       # Tries to find a default context to feed the price calculation
+       # process. For example, it will set a context in which the 
+       # destination_section is set to the end user the the currency
+       # to the preferred currency of the end user
+       method = self._getTypeBasedMethod('getPriceCalculationDefaultContext')
+       if method is not None:
+         return method()
+
     security.declareProtected(Permissions.AccessContentsInformation,
                               'getPriceParameterDict')
     def getPriceParameterDict(self, context=None, REQUEST=None,
@@ -659,7 +668,7 @@ class Resource(XMLObject, XMLMatrix, VariatedMixin):
       """
       # Search all categories context
       if context is None:
-        new_category_list = []
+        new_category_list = []  # Better create a TempMovement ZAXEE
       else:
         new_category_list = context.getCategoryList()
       #XXX This should be 'category_list' instead of 'categories' to respect
@@ -683,7 +692,7 @@ class Resource(XMLObject, XMLMatrix, VariatedMixin):
       # Generate the fake context
       tmp_context = self.asContext(context=context,
                                    categories=new_category_list,
-                                   REQUEST=REQUEST, **kw)
+                                   REQUEST=REQUEST, **kw) #  ZAWEE nonsens to use **kw in both places, two parameters needed probably **kw and predicate_kw
       # XXX When called for a generated amount, base_application may point
       #     to nonexistant base_amount (e.g. "base_amount/produced_quantity" for
       #     transformations), which would make domain tool return nothing.
@@ -850,7 +859,11 @@ class Resource(XMLObject, XMLMatrix, VariatedMixin):
     def getPrice(self, default=None, context=None, REQUEST=None, **kw):
       """
       Return the unit price of a resource in a specific context.
+
+      ZAWEE - parameters should be well defined **kw parlty used to select predicate and build context
       """
+      # HACK for default price
+      if context is None: context=self.Resource_getPriceCalculationDefaultContext() # ZAWEE
       # see Movement.getPrice
       if isinstance(default, Base) and context is None:
         msg = 'getPrice first argument is supposed to be the default value'\