1 files changed, 9 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/cast.rb b/activerecord/lib/active_record/connection_adapters/postgresql/cast.rb
index a73f0ac57f..56dc9ea813 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/cast.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/cast.rb
@@ -115,7 +115,7 @@ module ActiveRecord
         end
 
         def string_to_array(string, oid)
-          parse_pg_array(string).map{|val| oid.type_cast val}
+          parse_pg_array(string).map {|val| type_cast_array(oid, val)}
         end
 
         private
@@ -146,6 +146,14 @@ module ActiveRecord
               "\"#{value.gsub(/"/,"\\\"")}\""
             end
           end
+
+          def type_cast_array(oid, value)
+            if ::Array === value
+              value.map {|item| type_cast_array(oid, item)}
+            else
+              oid.type_cast value
+            end
+          end
       end
     end
   end