From 95cf16a6a0521a5bd78222f847953e6c7dd6fbe6 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <encukou@gmail.com>
Date: Wed, 13 Apr 2011 18:43:34 +0300
Subject: [PATCH] Make pokedex work with SQLAlchemy 0.7. Warning: ugly hack!

In its quest to reduce the number of calls, SQLAlchemy 0.7 sometimes
bypasses session.execute, where the _default_language_id bound parameter
was set.

Monkeypatching the connection works for now, but I hope there's a better
way (see multilang.py).
---
 pokedex/db/load.py      |  1 -
 pokedex/db/markdown.py  |  4 ++--
 pokedex/db/multilang.py | 27 ++++++++++++++++-----------
 setup.py                |  2 +-
 4 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/pokedex/db/load.py b/pokedex/db/load.py
index d307fd8..d0dc00b 100644
--- a/pokedex/db/load.py
+++ b/pokedex/db/load.py
@@ -4,7 +4,6 @@ import fnmatch
 import os.path
 import sys
 
-from sqlalchemy.orm.attributes import instrumentation_registry
 import sqlalchemy.sql.util
 import sqlalchemy.types
 
diff --git a/pokedex/db/markdown.py b/pokedex/db/markdown.py
index 1ad304c..c9fd9a7 100644
--- a/pokedex/db/markdown.py
+++ b/pokedex/db/markdown.py
@@ -12,7 +12,7 @@ spline-pokedex.
 from __future__ import absolute_import
 
 import markdown
-import sqlalchemy.types
+import sqlalchemy
 
 class MarkdownString(object):
     """Wraps a Markdown string.  Stringifies to the original text, but .as_html
@@ -103,7 +103,7 @@ class MoveEffectPropertyMap(MoveEffectProperty):
             newdict[key] = _markdownify_effect_text(obj, newdict[key])
         return newdict
 
-class MarkdownColumn(sqlalchemy.types.TypeDecorator):
+class MarkdownColumn(sqlalchemy.TypeDecorator):
     """Generic SQLAlchemy column type for Markdown text.
 
     Do NOT use this for move effects!  They need to know what move they belong
diff --git a/pokedex/db/multilang.py b/pokedex/db/multilang.py
index 7e2840f..d027d13 100644
--- a/pokedex/db/multilang.py
+++ b/pokedex/db/multilang.py
@@ -5,8 +5,9 @@ from sqlalchemy.orm import aliased, compile_mappers, mapper, relationship, synon
 from sqlalchemy.orm.collections import attribute_mapped_collection
 from sqlalchemy.orm.scoping import ScopedSession
 from sqlalchemy.orm.session import Session, object_session
+from sqlalchemy.engine.base import Connection
 from sqlalchemy.schema import Column, ForeignKey, Table
-from sqlalchemy.sql.expression import and_, bindparam, select
+from sqlalchemy.sql.expression import and_, bindparam, select, Select
 from sqlalchemy.types import Integer
 
 def create_translation_table(_table_name, foreign_class, relation_name,
@@ -167,20 +168,24 @@ class MultilangSession(Session):
 
         super(MultilangSession, self).__init__(*args, **kwargs)
 
-    def execute(self, clause, params=None, *args, **kwargs):
-        if not params:
-            params = {}
-        params.setdefault('_default_language_id', self.default_language_id)
-
-        return super(MultilangSession, self).execute(
-            clause, params, *args, **kwargs)
+    def connection(self, *args, **kwargs):
+        """Monkeypatch the connection. Not pretty at all.
+        """
+        conn = super(MultilangSession, self).connection(*args, **kwargs)
+        original_execute = conn.execute
+        if original_execute.__name__ != 'monkeypatched_execute':
+            def monkeypatched_execute(statement, *multiparams, **params):
+                if isinstance(statement, Select):
+                    boundparams = dict(multiparams[0])
+                    boundparams.setdefault('_default_language_id', self.default_language_id)
+                    multiparams = [boundparams] + list(multiparams[1:])
+                return original_execute(statement, *multiparams, **params)
+            conn.execute = monkeypatched_execute
+        return conn
 
 class MultilangScopedSession(ScopedSession):
     """Dispatches language selection to the attached Session."""
 
-    def __init__(self, *args, **kwargs):
-        super(MultilangScopedSession, self).__init__(*args, **kwargs)
-
     @property
     def default_language_id(self):
         """Passes the new default language id through to the current session.
diff --git a/setup.py b/setup.py
index 3bc7028..2f5887e 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@ setup(
         'pokedex': ['data/csv/*.csv']
     },
     install_requires=[
-        'SQLAlchemy>=0.6.6',
+        'SQLAlchemy>=0.7.0b3',
         'whoosh>=1.1.0',
         'markdown',
         'construct',
-- 
2.7.4