1 files changed, 12 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
index 1a66afb23a..b969503178 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
@@ -33,7 +33,11 @@ module ActiveRecord
 
           def serialize(value)
             if value.is_a?(::Array)
-              @pg_encoder.encode(type_cast_array(value, :serialize))
+              result = @pg_encoder.encode(type_cast_array(value, :serialize))
+              if encoding = determine_encoding_of_strings(value)
+                result.encode!(encoding)
+              end
+              result
             else
               super
             end
@@ -63,6 +67,13 @@ module ActiveRecord
                 @subtype.public_send(method, value)
               end
             end
+
+            def determine_encoding_of_strings(value)
+              case value
+              when ::Array then determine_encoding_of_strings(value.first)
+              when ::String then value.encoding
+              end
+            end
         end
       end
     end