1 files changed, 23 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
new file mode 100644
index 0000000000..acb1278499
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
@@ -0,0 +1,23 @@
+module ActiveRecord
+  module ConnectionAdapters
+    # PostgreSQL-specific extensions to column definitions in a table.
+    class PostgreSQLColumn < Column #:nodoc:
+      attr_reader :array
+      alias :array? :array
+
+      def initialize(name, default, cast_type, sql_type = nil, null = true, default_function = nil)
+        if sql_type =~ /\[\]$/
+          @array = true
+          sql_type = sql_type[0..sql_type.length - 3]
+        else
+          @array = false
+        end
+        super
+      end
+
+      def serial?
+        default_function && default_function =~ /\Anextval\(.*\)\z/
+      end
+    end
+  end
+end