merged the polymorphic relationship refactoring branch in. i want to go further on that branch and introduce the foreign_keys argument, and further centralize the "intelligence" about the joins and selectables into PropertyLoader so that lazyloader/sync can be simplified, but the current branch goes pretty far.

  - relations keep track of "polymorphic_primaryjoin", "polymorphic_secondaryjoin" which it derives from the plain primaryjoin/secondaryjoin.
  - lazy/eagerloaders work from those polymorphic join objects.
  - the join exported by PropertyLoader to Query/SelectResults is the polymorphic join, so that join_to/etc work properly.
  - Query builds itself against the base Mapper again, not the "polymorphic" mapper.  uses the "polymorphic" version
 only as appropriate.  this helps join_by/join_to/etc to work with polymorphic mappers.
  - Query will also adapt incoming WHERE criterion to the polymorphic mapper, i.e. the "people" table becomes the "person_join" automatically.
  - quoting has been modified since labels made out of non-case-sensitive columns could themselves require quoting..so case_sensitive defaults to True if not otherwise specified (used to be based on the identifier itself).
  - the test harness gets an ORMTest base class and a bunch of the ORM unit tests are using it now, decreases a lot of redundancy.

1 files changed, 7 insertions, 0 deletions

diff --git a/test/sql/quote.py b/test/sql/quote.py
index 6438586f6..8ae228031 100644
--- a/test/sql/quote.py
+++ b/test/sql/quote.py
@@ -89,6 +89,13 @@ class QuoteTest(PersistTest):
         where the "UPPERCASE" column of "LaLa" doesnt exist.
         """
         x = table1.select(distinct=True).alias("LaLa").select().scalar()
+
+    def testlabels2(self):
+        metadata = MetaData()
+        table = Table("ImATable", metadata, 
+            Column("col1", Integer))
+        x = select([table.c.col1.label("ImATable_col1")]).alias("SomeAlias")
+        assert str(select([x.c.ImATable_col1])) == '''SELECT "SomeAlias"."ImATable_col1" \nFROM (SELECT "ImATable".col1 AS "ImATable_col1" \nFROM "ImATable") AS "SomeAlias"'''
         
     def testlabelsnocase(self):
         metadata = MetaData()