1 files changed, 4 insertions, 11 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
index 37e5c3859c..0eb4fb468c 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
@@ -2,18 +2,11 @@ module ActiveRecord
   module ConnectionAdapters
     # PostgreSQL-specific extensions to column definitions in a table.
     class PostgreSQLColumn < Column #:nodoc:
-      attr_accessor :array
+      delegate :array, :oid, :fmod, to: :sql_type_metadata
+      alias :array? :array
 
-      def initialize(name, default, cast_type, sql_type = nil, null = true, default_function = nil)
-        if sql_type =~ /\[\]$/
-          @array = true
-          super(name, default, cast_type, sql_type[0..sql_type.length - 3], null)
-        else
-          @array = false
-          super(name, default, cast_type, sql_type, null)
-        end
-
-        @default_function = default_function
+      def serial?
+        default_function && default_function =~ /\Anextval\(.*\)\z/
       end
     end
   end