Base: add isDeletable method to check if an object can be deleted

product/ERP5/ERP5Site.py

@@ -368,6 +368,11 @@ class ERP5Site(FolderMixIn, CMFSite, CacheCookieMixin):
 
     return self
 
+  security.declareProtected(Permissions.AccessContentsInformation,
+                            'isDeletable')
+  def isDeletable(self, check_relation):
+    return False
+
   security.declarePrivate('manage_beforeDelete')
   def manage_beforeDelete(self, item, container):
     # skin is setup during __before_publishing_traverse__, which

product/ERP5Form/Document/Preference.py

@@ -95,3 +95,8 @@ class Preference( Folder ):
   def disable(self, **kw):
     """Workflow method"""
     self._clearCache()
+
+  security.declareProtected(Permissions.AccessContentsInformation,
+                            'isDeletable')
+  def isDeletable(self, check_relation):
+    return not (check_relation and self.getRelationCountForDeletion())

product/ERP5Type/Base.py

@@ -2684,6 +2684,20 @@ class Base( CopyContainer,
     else:
       return False
 
+  security.declareProtected(Permissions.AccessContentsInformation,
+                            'isDeletable')
+  def isDeletable(self, check_relation):
+    """Test if object can be delete"""
+    portal = self.getPortalObject()
+    if not portal.portal_workflow.isTransitionPossible(self, 'delete'):
+      if not portal.portal_membership.checkPermission(
+          'Delete objects', self.getParentValue()):
+        return False
+      for wf_id in getattr(aq_base(self), "workflow_history", ()):
+        if wf_id != 'edit_workflow':
+          return False
+    return not (check_relation and self.getRelationCountForDeletion())
+
   security.declareProtected(Permissions.AccessContentsInformation,
                             'isDeleted')
   def isDeleted(self):