Rails:从模型方法访问字段值

@语法用于实例变量,这些变量(例如)在控制器中填充,然后在视图中使用。不是你在做什么。

你只需要

def formal_name
  title + " " + forename + " " + surname
end

self.<field> 因为模棱两可。

class MyModel << ActiveRecord

  def formal_name
    title = self.title # return title attribute of instance
    forename = self.forename
    surename = self.surname

    # or something like this
    self.title + self.surename
  end

end