My sequel model language file

gistfile1.txt

{   scopeName = 'source.ruby.sequel.basic';
    fileTypes = ( 'rb' );
    patterns = (
       {   name = 'meta.function.method.with-arguments.ruby.sequel';
           begin = '^\s*(def_dataset_method)\s*';
           end = '$';
           beginCaptures = {
               1 = { name = 'keyword.control.def.ruby';};
           };
           patterns = ( { include = 'source.ruby'; } );
       },
       { include = 'source.ruby'; }
    );
}

gistfile2.rb

class MyModel < Sequel::Model
  def_dataset_method :last do
    order(:id.desc).first
  end
end