From e288aff8eae6d08b040ad9026449ff4578104d1b Mon Sep 17 00:00:00 2001 From: Mike Bayer Date: Sun, 23 Jun 2013 14:03:47 -0400 Subject: The resolution of :class:`.ForeignKey` objects to their target :class:`.Column` has been reworked to be as immediate as possible, based on the moment that the target :class:`.Column` is associated with the same :class:`.MetaData` as this :class:`.ForeignKey`, rather than waiting for the first time a join is constructed, or similar. This along with other improvements allows earlier detection of some foreign key configuration issues. Also included here is a rework of the type-propagation system, so that it should be reliable now to set the type as ``None`` on any :class:`.Column` that refers to another via :class:`.ForeignKey` - the type will be copied from the target column as soon as that other column is associated, and now works for composite foreign keys as well. [ticket:1765] --- lib/sqlalchemy/sql/compiler.py | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'lib/sqlalchemy/sql/compiler.py') diff --git a/lib/sqlalchemy/sql/compiler.py b/lib/sqlalchemy/sql/compiler.py index dd2a6e08c..f1fe53b73 100644 --- a/lib/sqlalchemy/sql/compiler.py +++ b/lib/sqlalchemy/sql/compiler.py @@ -2415,7 +2415,9 @@ class GenericTypeCompiler(engine.TypeCompiler): return self.visit_VARCHAR(type_) def visit_null(self, type_): - raise NotImplementedError("Can't generate DDL for the null type") + raise exc.CompileError("Can't generate DDL for %r; " + "did you forget to specify a " + "type on this Column?" % type_) def visit_type_decorator(self, type_): return self.process(type_.type_engine(self.dialect)) -- cgit v1.2.1