ruby-on-rails - 返回 NoMethodError 的类方法：未定义的方法 Rails

Question

我正在编写一个类方法来在我的数据库中查找某些数据，但是我收到了 NoMethodError: undefined method 错误。我正在使用 Datamapper 而不是 ActiveRecord。这是我的错误输出：

NoMethodError: undefined method `get_courses_starting_in' for Course:Class
    from /Users/hugo/.rvm/gems/ruby-1.9.2-p318/gems/dm-ar-finders-1.2.0/lib/dm-ar-finders.rb:155:in `method_missing_with_find_by'
    from /Users/hugo/Web Development/Rails/connectedtrips/lib/ct_gems/dm-core-1.2.0/lib/dm-core/model/relationship.rb:372:in `method_missing'
    from /Users/hugo/Web Development/Rails/connectedtrips/lib/ct_gems/dm-core-1.2.0/lib/dm-core/model/property.rb:249:in `method_missing'
    from (irb):24
    from /Users/hugo/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/commands/console.rb:47:in `start'
    from /Users/hugo/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/commands/console.rb:8:in `start'
    from /Users/hugo/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

这是我的课堂方法：

def self.get_courses_starting_in
    courses = []
    Course.all.each{ |course| courses << course if course.days_till_course_starts == 7}
    return courses
  end

我希望有人能帮帮忙。谢谢。

Answer 1

启动控制台后有没有写代码？重新启动控制台并再次检查。