provide more control on what is shown in list or grid via new 'represents' predicate for resources

browser/lobo/standard.pt

@@ -17,7 +17,7 @@
                          title cell/description">
         <div class="legend">
           <b tal:content="cell/title" /><br />
-          <i tal:content="structure cell/renderedDescription" />
+          <i tal:content="structure cell/textRepresentation" />
         </div>
       </a>
     </div>
@@ -36,7 +36,7 @@
       <a tal:attributes="href cell/targetUrl">
         <b tal:content="cell/title" /></a><br />
       <tal:desc condition="cell/description">
-        <span tal:content="structure cell/renderedDescription" /></tal:desc>
+        <span tal:content="structure cell/textRepresentation" /></tal:desc>
       <br />
     </div>
   </tal:cell>

browser/lobo/standard.py

@@ -1,5 +1,5 @@
 #
-#  Copyright (c) 2011 Helmut Merz helmutm@cy55.de
+#  Copyright (c) 2012 Helmut Merz helmutm@cy55.de
 #
 #  This program is free software; you can redistribute it and/or modify
 #  it under the terms of the GNU General Public License as published by
@@ -18,8 +18,6 @@
 
 """
 View classes for lobo (blueprint-based) layouts.
-
-$Id$
 """
 
 from cgi import parse_qs
@@ -66,8 +64,20 @@ class ConceptView(BaseConceptView):
 
     @Lazy
     def resources(self):
+        return self.getResources()
+
+    @Lazy
+    def representingResources(self):
+        pred = self.representationPredicate
+        if pred is None:
+            return {}
+        return self.getResources([pred])
+
+    def getResources(self, predicates=None):
         result = dict(texts=[], images=[], files=[])
-        for r in self.context.getResources([self.defaultPredicate]):
+        if predicates is None:
+            predicates = [self.defaultPredicate]
+        for r in self.context.getResources(predicates):
             if r.contentType.startswith('text/'):
                 result['texts'].append(r)
             if r.contentType.startswith('image/'):
@@ -81,6 +91,10 @@ class ConceptView(BaseConceptView):
         for r in self.resources['images']:
             yield r
 
+    @Lazy
+    def representationPredicate(self):
+        return self.conceptManager.get('represents')
+
     # properties from base class: title, description, renderedDescription
 
     @Lazy
@@ -99,6 +113,12 @@ class ConceptView(BaseConceptView):
             return u''
         return self.renderDescription(self.textDescription)
 
+    @Lazy
+    def textRepresentation(self):
+        for r in self.representingResources.get('texts', []):
+            return self.renderText(r.data, r.contentType)
+        return self.renderedDescription
+
     @Lazy
     def targetUrl(self):
         return self.nodeView.getUrlForTarget(self.context)

organize/stateful/base.py

@@ -67,9 +67,13 @@ class StatefulConceptIndexInfo(IndexInfo):
     @property
     def availableStatesDefinitions(self):
         globalOptions = IOptions(self.context.getLoopsRoot())
-        typeOptions = IOptions(adapted(self.context.conceptType))
-        return (globalOptions('organize.stateful.concept', []) +
-                typeOptions('organize.stateful', []))
+        type = self.context.conceptType
+        if type is None:    # may happen during object creation
+            return globalOptions('organize.stateful.concept', [])
+        else:
+            typeOptions = IOptions(adapted(type))
+            return (globalOptions('organize.stateful.concept', []) +
+                    typeOptions('organize.stateful', []))
 
 
 class StatefulResourceIndexInfo(IndexInfo):