From 7c663e0b01c4148fc74b230f62058cd5df801b51 Mon Sep 17 00:00:00 2001
From: Antonio Ospite <ao2@ao2.it>
Date: Sat, 9 Dec 2017 20:09:40 +0100
Subject: [PATCH] Issue #2927227: d6_url_alias migration fails when the src
 path in D6 contains no slashes
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The extract plugin in the d6_url_alias migration tries to get what might
be a node id from the source path (e.g. 'node/1'), the extracted value
will then be passed to a migrate_lookup plugin to fetch a node if the
value is actually a nid.

However this "lazy" extraction approach fails hard when the source path
has no slashes (e.g. 'contact') because in these case the index 1 is
invalid, resulting in this message:

  Array index missing, extraction failed.

Fix migrating these paths by providing a dummy default value when the
extraction fails.
---
 modules/path/migrations/d6_url_alias.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core/modules/path/migrations/d6_url_alias.yml b/core/modules/path/migrations/d6_url_alias.yml
index fcf2036405..c5d793411e 100644
--- a/core/modules/path/migrations/d6_url_alias.yml
+++ b/core/modules/path/migrations/d6_url_alias.yml
@@ -27,6 +27,7 @@ process:
       delimiter: /
     -
       plugin: extract
+      default: 'INVALID_NID'
       index:
         - 1
     -
-- 
2.15.1