add upgrade step

Author: jnptk

src/plone/volto/profiles/default/metadata.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <metadata>
-  <version>1019</version>
+  <version>1020</version>
   <dependencies>
     <dependency>profile-plone.restapi:blocks</dependency>
   </dependencies>

src/plone/volto/upgrades.py

@@ -190,3 +190,16 @@ def update_robots_txt(context):
         logger.info(
             "Ignoring plone.robots_txt registry as it was modified in this portal."
         )
+
+
+def reindex_block_types(context):
+    catalog = getToolByName(context, "portal_catalog")
+    brains = catalog(object_provides="plone.restapi.behaviors.IBlocks")
+    total = len(brains)
+    for index, brain in enumerate(brains):
+        obj = brain.getObject()
+        obj.reindexObject(idxs=["block_types"], update_metadata=0)
+        logger.info("Reindexing object %s.", brain.getPath())
+        if index % 250 == 0:
+            logger.info(f"Reindexed {index}/{total} objects")
+            transaction.commit()

src/plone/volto/upgrades.zcml

@@ -96,4 +96,14 @@
         handler=".upgrades.update_robots_txt"
         />
   </genericsetup:upgradeSteps>
+  <genericsetup:upgradeSteps
+      profile="plone.volto:default"
+      source="1019"
+      destination="1020"
+      >
+    <genericsetup:upgradeStep
+        title="Update robots_txt setting for Volto"
+        handler=".upgrades.reindex_block_types"
+        />
+  </genericsetup:upgradeSteps>
 </configure>