From cd9c309b78de443d2e37760998418616ba34276d Mon Sep 17 00:00:00 2001
From: Pierre Chapuis <catwell@archlinux.us>
Date: Sat, 6 Feb 2021 11:03:44 +0100
Subject: [PATCH] deal with `nil` document types in Multimodel

---
 elasticsearch-model/lib/elasticsearch/model/multimodel.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/elasticsearch-model/lib/elasticsearch/model/multimodel.rb b/elasticsearch-model/lib/elasticsearch/model/multimodel.rb
index 2c2306274..f9ef2eaea 100644
--- a/elasticsearch-model/lib/elasticsearch/model/multimodel.rb
+++ b/elasticsearch-model/lib/elasticsearch/model/multimodel.rb
@@ -85,7 +85,7 @@ def index_name
       # @return [Array] the list of document types used for retrieving documents
       #
       def document_type
-        models.map { |m| m.document_type }
+        models.map { |m| m.document_type }.compact.presence
       end
 
       # Get the client common for all models