--- a/_exceptions.py	Mon Sep 27 17:14:23 2010 +0200
+++ b/_exceptions.py	Fri Sep 24 15:00:08 2010 +0200
@@ -130,14 +130,20 @@
     """
 
 class NoSelectableObject(RegistryException):
-    """some views with the given vid have been found but no
-    one is applicable to the result set
-    """
+    """raised when no appobject is selectable for a given context."""
+    def __init__(self, args, kwargs, appobjects):
+        self.args = args
+        self.kwargs = kwargs
+        self.appobjects = appobjects
+
+    def __str__(self):
+        return ('args: %s, kwargs: %s\ncandidates: %s'
+                % (self.args, self.kwargs.keys(), self.appobjects))
+
 
 class UnknownProperty(RegistryException):
     """property found in database but unknown in registry"""
 
-
 # query exception #############################################################
 
 class QueryError(CubicWebRuntimeError):

--- a/doc/book/en/devweb/controllers.rst	Mon Sep 27 17:14:23 2010 +0200
+++ b/doc/book/en/devweb/controllers.rst	Fri Sep 24 15:00:08 2010 +0200
@@ -15,13 +15,12 @@
 
 `Browsing`:
 
-* the View controlleris associated with most browsing actions within a
-  CubicWeb application: it always instantiates a
-  :ref:`the_main_template` and lets the ResultSet/Views dispatch
-  system build up the whole content; it handles ObjectNotFound and
-  NoSelectableObject errors that may bubble up to its entry point, in
-  an end-user-friendly way (but other programming errors will slip
-  through)
+* the View controller is associated with most browsing actions within a
+  CubicWeb application: it always instantiates a :ref:`the_main_template` and
+  lets the ResultSet/Views dispatch system build up the whole content; it
+  handles :exc:`ObjectNotFound` and :exc:`NoSelectableObject` errors that may
+  bubble up to its entry point, in an end-user-friendly way (but other
+  programming errors will slip through)
 
 * the JSon controller (same module) provides services for Ajax calls,
   typically using JSON as a serialization format for input, and
@@ -49,7 +48,7 @@
   for outgoing email notifications
 
 * the MailBugReport controller (web/views/basecontrollers.py) allows
-  to quickly have a `repotbug` feature in one's application
+  to quickly have a `reportbug` feature in one's application
 
 Registration
 ++++++++++++

--- a/vregistry.py	Mon Sep 27 17:14:23 2010 +0200
+++ b/vregistry.py	Fri Sep 24 15:00:08 2010 +0200
@@ -46,6 +46,7 @@
 from cubicweb import RegistryNotFound, ObjectNotFound, NoSelectableObject
 from cubicweb.appobject import AppObject, class_regid
 
+
 def _toload_info(path, extrapath, _toload=None):
     """return a dictionary of <modname>: <modpath> and an ordered list of
     (file, module name) to load
@@ -221,17 +222,14 @@
             elif appobjectscore > 0 and appobjectscore == score:
                 winners.append(appobject)
         if winners is None:
-            raise NoSelectableObject('args: %s\nkwargs: %s %s'
-                                     % (args, kwargs.keys(),
-                                        [repr(v) for v in appobjects]))
+            raise NoSelectableObject(args, kwargs, appobjects)
         if len(winners) > 1:
             # log in production environement / test, error while debugging
+            msg = 'select ambiguity: %s\n(args: %s, kwargs: %s)'
             if self.config.debugmode or self.config.mode == 'test':
-                raise Exception('select ambiguity, args: %s\nkwargs: %s %s'
-                                % (args, kwargs.keys(),
-                                   [repr(v) for v in winners]))
-            self.error('select ambiguity, args: %s\nkwargs: %s %s',
-                       args, kwargs.keys(), [repr(v) for v in winners])
+                # raise bare exception in debug mode
+                raise Exception(msg % (winners, self.args, self.kwargs.keys()))
+            self.error(msg, winners, self.args, self.kwargs.keys())
         # return the result of calling the appobject
         return winners[0](*args, **kwargs)
 

--- a/web/views/basecontrollers.py	Mon Sep 27 17:14:23 2010 +0200
+++ b/web/views/basecontrollers.py	Fri Sep 24 15:00:08 2010 +0200
@@ -154,7 +154,6 @@
             else:
                 req.set_message(req._("You have no access to this view or it can not "
                                       "be used to display the current data."))
-            self.warning("the view %s can not be applied to this query", vid)
             vid = req.form.get('fallbackvid') or vid_from_rset(req, rset, req.vreg.schema)
             view = req.vreg['views'].select(vid, req, rset=rset)
         return view, rset