- express most of the orm.util functions in terms of the inspection system

- modify inspection system:
	1. raise a new exception for any case where the inspection
        context can't be returned.  this supersedes the "not mapped"
        errors.
        2. don't configure mappers on a mapper inspection.  this allows
        the inspectors to be used during mapper config time.  instead,
        the mapper configures on "with_polymorphic_selectable" now,
        which is needed for all queries
- add a bunch of new "is_XYZ" attributes to inspectors
- finish making the name change of "compile" -> "configure", for some reason
this was only done partially

1 files changed, 10 insertions, 1 deletions

diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py
index 631a1b205..46873c859 100644
--- a/lib/sqlalchemy/sql/expression.py
+++ b/lib/sqlalchemy/sql/expression.py
@@ -29,7 +29,7 @@ to stay the same in future releases.
 import itertools, re
 from operator import attrgetter
 
-from .. import util, exc
+from .. import util, exc, inspection
 from . import operators
 from .operators import ColumnOperators
 from .visitors import Visitable, cloned_traverse
@@ -1525,6 +1525,7 @@ class ClauseElement(Visitable):
     _from_objects = []
     bind = None
     _is_clone_of = None
+    is_selectable = False
 
     def _clone(self):
         """Create a shallow copy of this ClauseElement.
@@ -1841,6 +1842,8 @@ class ClauseElement(Visitable):
             return '<%s.%s at 0x%x; %s>' % (
                 self.__module__, self.__class__.__name__, id(self), friendly)
 
+inspection._self_inspects(ClauseElement)
+
 
 class _Immutable(object):
     """mark a ClauseElement as 'immutable' when expressions are cloned."""
@@ -2394,6 +2397,12 @@ class Selectable(ClauseElement):
     """mark a class as being selectable"""
     __visit_name__ = 'selectable'
 
+    is_selectable = True
+
+    @property
+    def selectable(self):
+        return self
+
 class FromClause(Selectable):
     """Represent an element that can be used within the ``FROM``
     clause of a ``SELECT`` statement.