PostgreSQL, Fix change detection caused by wrong data for bytea unescaping.

This showed up when running BinaryTest#test_load_save with the more
restrictive input string handling of pg-0.18.0.pre20141117110243.gem .

Bytea values sent to the server are in binary format, but are
returned back as escaped text. To fulfill the assumption that
type_cast_from_database(type_cast_for_database(binary)) == binary
we unescape only, if the value was really received from the server.

1 files changed, 1 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/bytea.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/bytea.rb
index 997613d7be..6bd1b8ecae 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/bytea.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/bytea.rb
@@ -5,6 +5,7 @@ module ActiveRecord
         class Bytea < Type::Binary # :nodoc:
           def type_cast_from_database(value)
             return if value.nil?
+            return value.to_s if value.is_a?(Type::Binary::Data)
             PGconn.unescape_bytea(super)
           end
         end