如何在 Rails 模型的构造函数中使用参数

发布于 2024-12-19 15:07:27 字数 308 浏览 0 评论 0原文

我尝试使用 RSpec 学习 tdd。我从网上找到的备忘单中获取了这个示例，但对于如何实现它有点困惑。添加 MovieList.new 是自动的，但是当 ActiveRecord 已处理该参数时，我将如何添加参数。然后添加“forward”方法。

describe "forward" do
  it "should jump to a next movie" do
    next_movie = MovieList.new(2).forward
    next_movie.track_number.should == 2
  end
end

原文

I trying to learn tdd using RSpec. I took this example from a cheat sheet I found online and am a bit confused as to how I would implement it. To add MovieList.new is automatic but how would I go about adding a parameter when it is already handled with ActiveRecord. And then to add the 'forward' method as well.

describe "forward" do
  it "should jump to a next movie" do
    next_movie = MovieList.new(2).forward
    next_movie.track_number.should == 2
  end
end

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嗼ふ静 2024-12-26 15:07:27

如果这是对 MovieList 类的测试，请创建一个名为 MovieList 的类。

然后在该类的构造函数中，确保它接受一个名为 track_number 的参数，在测试中它是 2。

然后创建一个名为forward 的方法来执行您需要它执行的任何操作？

这是我要这样做的一个很好的例子：
http://rspec.info/

这听起来可能模棱两可，但问题也是如此。

编辑：
这是如何创建新的 MovieList 类并使用名为 track_number 的参数对其进行初始化的粗略想法。

def MovieList
  attr_accessor :track_number

  def initialize(track_number)
    @track_number = track_number
  end

  # You can define all your class methods below, you 
  # can start with forward.

  def forward
    # do something...
  end 

end

If this is a test for a MovieList class, create a class called MovieList.

Then in your constructor for that class, make sure it takes in a parameter called track_number, in your test that's the 2.

Then create a method called forward to do whatever you need it to do?

Here's a good example of where I'm going with this:
http://rspec.info/

This may sound ambiguous, but so was the question.

EDIT:
This is a rough idea of how to create a new MovieList class and initialize it with a parameter called track_number.

def MovieList
  attr_accessor :track_number

  def initialize(track_number)
    @track_number = track_number
  end

  # You can define all your class methods below, you 
  # can start with forward.

  def forward
    # do something...
  end 

end

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雪落纷纷 2024-12-26 15:07:27

movie = Movie.new(:track_number => 2)
movie.forward

我不确定forward在你的例子中做了什么，因为你似乎将track_number初始化为2然后调用forward。我本来期望 track_number 增加，但你的测试正在检查它是否仍然是 2。

请注意，我不认为您需要更改构造函数来获取参数，只要您将其作为哈希传递（我的示例中隐含了单个成员哈希）...有人可以验证或反驳最后一个断言吗？

movie = Movie.new(:track_number => 2)
movie.forward

I am not sure what forward does in your example because you seem to be initializing track_number to 2 then calling forward. I would have expected track_number to increment but your test is checking to see if it's 2 still.

Note, I don't believe you need to change your constructor to take the parameter as long as you pass it in as a hash (the single member hash is implied in my example)...can someone verify or refute this last assertion?

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~没有更多了~