OK, I Have a working solution but I don' t think it's very pretty. It
appears Alberto was right about the rules being optimized if they could
be determined statically. I didn't detect that earlier though because
the func_original function wasn't returning the correct function.
Anyhow.. here is how this works.
1) Patch TG to user MultiorderGenericFunction
I got an ambiguous function def error when I tried it with stock TG.
Index: turbogears/database.py
===================================================================
--- turbogears/database.py (revision 2078)
+++ turbogears/database.py (working copy)
@@ -13,6 +13,7 @@
import turbogears
from turbogears import config, errorhandling
+from turbogears.genericfunctions import MultiorderGenericFunction
log = logging.getLogger("turbogears.database")
@@ -231,7 +232,7 @@
for hub in hub_registry:
hub.end()
-[dispatch.generic()]
+[dispatch.generic(MultiorderGenericFunction)]
def run_with_transaction(func, *args, **kw):
pass
2) Create a no_transaction decorator
from turbogears.decorator import weak_signature_decorator
def no_transaction():
def wrap(func):
def no_trans(func,*args,**kw):
cherrypy.request._no_trans=True
return func(*args,**kw)
return no_trans
return weak_signature_decorator(wrap)
3) create the test method for no_trans
This has to be in a method for the reasons stated at the top of the
post.
def is_no_trans():
return getattr(cherrypy.request,'_no_trans',False)
4) create the no trans method. Order=-1 is important so you go before
the default sa_rwt, and so_rwt conditions.
@run_with_transaction.when("is_no_trans()",order=-1)
def _no_trans_for_this_method(func, *args, **kw):
log.debug ( "No Trans Method" )
return func(*args, **kw)
5) In your controller code you can now decorate like this:
@no_transaction()
@expose()
def something(self): pass
Note that order is indeed important for no_transaction because the
request attribute must be set before it is tested for in the expose
method.
Well, this has been a long thread. This solution works for me but I'm
not sure it's very suited to suggest to others in the same boat.
Anyone have a better solution?
-Dennis
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