Question

现在，我在我的rb文件中有这个代码。它运作得很好：

project = PivotalTracker::Project.find(123456)  

get '/' do 
  @accepted = project.stories.all(:current_state => 'accepted').length
  @delivered = project.stories.all(:current_state => 'delivered').length
  @finished = project.stories.all(:current_state => 'finished').length    

  erb :home
end

我想创建一个totalStories函数来代替使用冗余代码的3条长行。

所以，我尝试了以下内容：

get '/' do 
  @accepted = totalStories('accepted')
  @delivered = totalStories('delivered')
  @finished = totalStories('finished')

  def totalStories(storyState)
    var estimate = project.stories.all(:current_state => storyState).length
    return var
  end

  erb :home
end

使用此代码，我收到错误：

NoMethodError at /
undefined method `totalStories' for #<Sinatra::Application:0x007f89bae6c800>

有关如何解决此错误的任何提示？谢谢！

更新我已将方法移到get块之外，但现在我收到一个新错误：undefined local variable or method project'`

project变量在方法之外和之上定义。

值得注意的是，我在其他get块中使用project变量。

Answer 1

改为使用帮助：

get '/' do
  @accepted = total_stories('accepted') 
  @delivered = total_stories('delivered')
  @finished = total_stories('finished')

  erb :home
end

helpers do
  def total_stories(option)
    # project = PivotalTracker::Project.find(123456)
    project.stories.all(:current_state => option).length
  end
end

添加@ sergey的答案，而不是上面的代码，您可以通过为该一个对象提供帮助来避免undefined method project错误。类似的东西：

get '/' do
  # same code
end

def total_stories(option)
  project(12345).stories.all(:current_state => option).length
  # The project object here causes an error since it looks for a 
  # project method (yes, instead of object) under Sinatra's Base or Application
  # hence, we define the method inside the helpers block
end

helpers do
  def project(id)
    # Here goes the PivotalTracker find method for that particular ID.
  end

end

希望有所帮助。

Answer 2

为什么不在'get'函数之外创建这个函数？

def totalStories(storyState)
    project.stories.all(:current_state => storyState).length
end

get '/' do 
  @accepted = totalStories('accepted')
  @delivered = totalStories('delivered')
  @finished = totalStories('finished')

  erb :home
end

您还可以缩短您的totalStories功能，并且只保留一个语句，因为将返回上一个计算结果。

无法访问.rb文件中的变量（sinatra）

2 个答案: