ActiveRecord should raise an error on invalid migration types.

activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

@@ -319,16 +319,19 @@ module ActiveRecord
       def method_missing(symbol, *args)
         if symbol.to_s == 'xml'
           xml_column_fallback(args)
+        else
+          super
         end
       end
 
       def xml_column_fallback(*args)
         case @base.adapter_name.downcase
-          when 'sqlite', 'mysql'
-            options = args.extract_options!
-            column(args[0], :text, options)
-          end
+        when 'sqlite', 'mysql'
+          options = args.extract_options!
+          column(args[0], :text, options)
         end
+      end
+
       # Appends a primary key definition to the table definition.
       # Can be called multiple times, but this is probably not a good idea.
       def primary_key(name)

activerecord/test/cases/ar_schema_test.rb

@@ -27,6 +27,16 @@ if ActiveRecord::Base.connection.supports_migrations?
       assert_nothing_raised { @connection.select_all "SELECT * FROM schema_migrations" }
       assert_equal 7, ActiveRecord::Migrator::current_version
     end
+
+    def test_schema_raises_an_error_for_invalid_column_ntype
+      assert_raise NoMethodError do
+        ActiveRecord::Schema.define(:version => 8) do
+          create_table :vegetables do |t|
+            t.unknown :color
+          end
+        end
+      end
+    end
   end
 
 end