Improved pyside_cache decorator

This one should work properly when multiple properties use the same
callback function.

blender_cloud/blender.py

@@ -45,29 +45,36 @@ def redraw(self, context):
     context.area.tag_redraw()
 
 
-def pyside_cache(wrapped):
-    """Stores the result of the callable in Python-managed memory.
+def pyside_cache(propname):
 
-    This is to work around the warning at
-    https://www.blender.org/api/blender_python_api_master/bpy.props.html#bpy.props.EnumProperty
-    """
+    if callable(propname):
+        raise TypeError('Usage: pyside_cache("property_name")')
 
-    import functools
+    def decorator(wrapped):
+        """Stores the result of the callable in Python-managed memory.
 
-    @functools.wraps(wrapped)
-    # We can't use (*args, **kwargs), because EnumProperty explicitly checks
-    # for the number of fixed positional arguments.
-    def wrapper(self, context):
-        result = None
-        try:
-            result = wrapped(self, context)
-            return result
-        finally:
-            wrapped._cached_result = result
-    return wrapper
+        This is to work around the warning at
+        https://www.blender.org/api/blender_python_api_master/bpy.props.html#bpy.props.EnumProperty
+        """
+
+        import functools
+
+        @functools.wraps(wrapped)
+        # We can't use (*args, **kwargs), because EnumProperty explicitly checks
+        # for the number of fixed positional arguments.
+        def wrapper(self, context):
+            result = None
+            try:
+                result = wrapped(self, context)
+                return result
+            finally:
+                rna_type, rna_info = getattr(self.bl_rna, propname)
+                rna_info['_cached_result'] = result
+        return wrapper
+    return decorator
 
 
-@pyside_cache
+@pyside_cache('version')
 def blender_syncable_versions(self, context):
     """Returns the list of items used by SyncStatusProperties.version EnumProperty."""
 
@@ -130,7 +137,7 @@ class SyncStatusProperties(PropertyGroup):
         self['available_blender_versions'] = new_versions
 
 
-@pyside_cache
+@pyside_cache('project')
 def bcloud_available_projects(self, context):
     """Returns the list of items used by BlenderCloudProjectGroup.project EnumProperty."""