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POError message in online Rails course on URL Shortener
 

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  1. POError message in online Rails course on URL Shortener
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    <p><a href="http://www.trybloc.com" rel="nofollow">TryBloc</a> has an online course that teaches Rails among other programming languages. There's a <a href="http://www.trybloc.com/courses/url_shortener" rel="nofollow">course on URL Shortening</a>, and I'm a bit puzzled by the rspec test that is failing on the fourth lesson (Storing the short codes).</p> <p>This is supposed to be something simple, and each lesson builds upon the previous ones. I feel as though I'm overlooking something small, but can't spot it. The error from rspec isn't helping either. How can I fix this and pass this fourth lesson? Am I reading the instruction correctly?</p> <p>The instruction:</p> <blockquote> <p>In your first challenge, we asked you to return only a random string of 5 digits.</p> <p>CHALLENGE Set the code you generate as a key in Redis so that we remember the same key for a domain.</p> </blockquote> <p>The example given:</p> <pre><code>REDIS.set("12345", "google.com") REDIS.get("12345") # google.com REDIS.exists("12345") # true, the key exists </code></pre> <p>The Code that can be modified:</p> <pre><code>require 'sinatra' configure do require 'redis' require 'uri' REDISTOGO_URL = ENV["REDISTOGO_URL"] uri = URI.parse(REDISTOGO_URL) REDIS = Redis.new(:host =&gt; uri.host, :port =&gt; uri.port, :password =&gt; uri.password) end get "/" do "Try going to /shorten?url=http://www.google.com" end # yourapp.com/?url=http://google.com get "/shorten" do # Write your code below to create a random number. random_number = (1..9).to_a.shuffle.sample(5).join("") REDIS.set(random_number, params[:url]) end # Please leave this extra space at the bottom </code></pre> <p>The error:</p> <blockquote> <p>F..</p> <p>Failures:</p> <p>1) URL Shortener returns a short code</p> <pre><code>Failure/Error: last_response.body.should =~ /(\d){5}/ expected: /(\d){5}/ got: "http://google.com" (using =~) Diff: @@ -1,2 +1,2 @@ -/(\d){5}/ +http://google.com # ./spec:42:in `block (2 levels) in &lt;top (required)&gt;' </code></pre> <p>Finished in 0.4169 seconds</p> <p>3 examples, 1 failure</p> <p>Failed examples:</p> <p>rspec ./spec:40 # URL Shortener returns a short code</p> </blockquote>
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    1. COIt's difficult for me to say which, if any, of your methods is failing the spec. However, this much is clear: the spec is testing a piece of your code, and expecting it to return a 5-digit code. Your code, however, is returning `"http://google.com"`. As an experiment, you might try putting `"12345"` as the last line in your `get "/shorten"` block.
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    2. CODoing that, I get: response_1.body.should_not == response_2.body expected not: == "12345" got: "12345".
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    3. COThat is because the RSpec is trying to ensure that the `"/shorten"` route does not return the same value between requests. I guess REDIS' job is to ensure that codes are not re-used? I'm going to post a suggested solution below.
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