trying to get mappers to support having versions against different tables for the same class,

that dont affect the original class mapper and create objects with the correct identity key
support in EagerLoader to better handle "selectalias" when the eager mapper hits another eager mapper, etc

3 files changed, 18 insertions, 6 deletions

diff --git a/lib/sqlalchemy/mapping/__init__.py b/lib/sqlalchemy/mapping/__init__.py
index ce693b2fb..f208a932e 100644
--- a/lib/sqlalchemy/mapping/__init__.py
+++ b/lib/sqlalchemy/mapping/__init__.py
@@ -117,6 +117,8 @@ def class_mapper(class_):
         pass
         raise "Class '%s' has no mapper associated with it" % class_.__name__
 
+mapperlib.class_mapper = class_mapper
+
 def assign_mapper(class_, *args, **params):
     params.setdefault("is_primary", True)
     if not isinstance(getattr(class_, '__init__'), types.MethodType):
diff --git a/lib/sqlalchemy/mapping/mapper.py b/lib/sqlalchemy/mapping/mapper.py
index eb54e0301..597214220 100644
--- a/lib/sqlalchemy/mapping/mapper.py
+++ b/lib/sqlalchemy/mapping/mapper.py
@@ -174,7 +174,10 @@ class Mapper(object):
             ):
             objectstore.global_attributes.reset_class_managed(self.class_)
             self._init_class()
-            
+            self.identitytable = self.primarytable
+        else:
+            self.identitytable = class_mapper(self.class_).table
+                
         if inherits is not None:
             for key, prop in inherits.props.iteritems():
                 if not self.props.has_key(key):
@@ -678,10 +681,9 @@ class Mapper(object):
         for key, value in self.props.iteritems():
             value.setup(key, statement, **kwargs) 
         return statement
-
         
     def _identity_key(self, row):
-        return objectstore.get_row_key(row, self.class_, self.primarytable, self.pks_by_table[self.table])
+        return objectstore.get_row_key(row, self.class_, self.identitytable, self.pks_by_table[self.table])
 
     def _instance(self, row, imap, result = None, populate_existing = False):
         """pulls an object instance from the given row and appends it to the given result
diff --git a/lib/sqlalchemy/mapping/properties.py b/lib/sqlalchemy/mapping/properties.py
index a58db251f..72cb44749 100644
--- a/lib/sqlalchemy/mapping/properties.py
+++ b/lib/sqlalchemy/mapping/properties.py
@@ -706,7 +706,7 @@ class EagerLoader(PropertyLoader):
             self.eagersecondary = self.secondaryjoin
             self.eager_order_by = self.order_by
             
-    def setup(self, key, statement, recursion_stack = None, **options):
+    def setup(self, key, statement, recursion_stack = None, eagertable=None, **options):
         """add a left outer join to the statement thats being constructed"""
 
         if recursion_stack is None:
@@ -726,12 +726,19 @@ class EagerLoader(PropertyLoader):
         else:
             towrap = self.parent.table
 
+        if eagertable is not None:
+            eagerprimary = self.eagerprimary.copy_container()
+            aliasizer = Aliasizer(self.parent.table, aliases={self.parent.table:eagertable})
+            eagerprimary.accept_visitor(aliasizer)
+        else:
+            eagerprimary = self.eagerprimary
+                
         if self.secondaryjoin is not None:
-            statement._outerjoin = sql.outerjoin(towrap, self.secondary, self.eagerprimary).outerjoin(self.eagertarget, self.eagersecondary)
+            statement._outerjoin = sql.outerjoin(towrap, self.secondary, eagerprimary).outerjoin(self.eagertarget, self.eagersecondary)
             if self.order_by is False and self.secondary.default_order_by() is not None:
                 statement.order_by(*self.secondary.default_order_by())
         else:
-            statement._outerjoin = towrap.outerjoin(self.eagertarget, self.eagerprimary)
+            statement._outerjoin = towrap.outerjoin(self.eagertarget, eagerprimary)
             if self.order_by is False and self.eagertarget.default_order_by() is not None:
                 statement.order_by(*self.eagertarget.default_order_by())
 
@@ -777,6 +784,7 @@ class EagerLoader(PropertyLoader):
         # the values against the columns of the mapper's original non-aliased table.
         if self.selectalias is not None:
             fakerow = {}
+            fakerow = util.DictDecorator(row)
             for c in self.eagertarget.c:
                 fakerow[c.original] = row[c]
             row = fakerow