add sql_compiler property to all Compiled subclasses for convenience

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/sqlalchemy/engine/base.py b/lib/sqlalchemy/engine/base.py
index 98d06a792..6886adee8 100644
--- a/lib/sqlalchemy/engine/base.py
+++ b/lib/sqlalchemy/engine/base.py
@@ -628,6 +628,16 @@ class Compiled(object):
 
         self.string = self.process(self.statement)
 
+    @property
+    def sql_compiler(self):
+        """Return a Compiled that is capable of processing SQL expressions.
+        
+        If this compiler is one, it would likely just return 'self'.
+        
+        """
+        
+        raise NotImplementedError()
+        
     def process(self, obj, **kwargs):
         return obj._compiler_dispatch(self, **kwargs)
 
diff --git a/lib/sqlalchemy/sql/compiler.py b/lib/sqlalchemy/sql/compiler.py
index 90def1941..43c38a1c5 100644
--- a/lib/sqlalchemy/sql/compiler.py
+++ b/lib/sqlalchemy/sql/compiler.py
@@ -232,6 +232,10 @@ class SQLCompiler(engine.Compiled):
     def is_subquery(self):
         return len(self.stack) > 1
 
+    @property
+    def sql_compiler(self):
+        return self
+        
     def construct_params(self, params=None, _group_number=None):
         """return a dictionary of bind parameter keys and values"""