[PATCH 3 of 5] [Simplification] on sort

julien tayon julien.tayon at logilab.fr
Fri Jun 7 15:40:05 CEST 2019

# HG changeset patch
# User julien tayon <julien.tayon at logilab.fr>
# Date 1559134954 -7200
#      Wed May 29 15:02:34 2019 +0200
# Node ID 41a7b43c31da05fea7a8a6e74d062a6352202a85
# Parent  0d1516ed43f806125ef957d8a302b95702f3c051
[Simplification] on sort

Since key is never used and I do have the strange feeling the order
was meant to be on the type.

Explanation itemgetter(1) referes to rschema, thus to an object which
does not support __lt__, __gt__ (ordering) has far as I can see, hence since
it works it means it probably uses __hash__ (used to make object subscriptable),
as a result order is random.

On the other hand type attributes is string, thus ... sortable

Tried to get in this part of the code using ?vid=owl using a pdb.set_trace
to check I was unable to achieve this point.

diff --git a/cubicweb/web/schemaviewer.py b/cubicweb/web/schemaviewer.py
--- a/cubicweb/web/schemaviewer.py
+++ b/cubicweb/web/schemaviewer.py
@@ -88,13 +88,9 @@ class SchemaViewer(object):
             def skipped_relation_schema(rschema):
                 return not (rschema.final or rschema.type in skiptypes)
-            relations = list(
-                filter(
-                    skipped_relation_schema,
-                    sorted(schema.relations(), key=attrgetter('type'))
-                ))
-            keys = [(rschema.type, rschema) for rschema in relations]
-            for key, rschema in sorted(keys, key=itemgetter(1)):
+            for rschema in sorted(
+                    filter(skipped_relation_schema, schema.relations()),
+                    key=itemgetter('type')):
                 relstr = self.visit_relationschema(rschema)
         return layout

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