Getting root key from AR::Relation

Author: joaomdmoura

lib/active_model/serializer/array_serializer.rb

@@ -19,7 +19,11 @@ def initialize(objects, options = {})
       end
 
       def json_key
-        @objects.first.json_key.pluralize if @objects.first
+        if @objects.first
+          @objects.first.json_key.pluralize
+        else
+          @objects.name.downcase.pluralize
+        end
       end
 
       def root=(root)