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    <p>Looks like there are a couple of potential issues here.</p> <p>For one, is your <code>if</code> statement actually on a separate line than your <code>errors.add_to_base...</code> statement? If so, your syntax is wrong; the <code>if</code> statement needs to be in the same line as the statement it's modifying. Even if it is actually on the correct line, I would recommend against using a trailing <code>if</code> statement on such a long line; it will make it hard to find the conditional.</p> <pre><code>if m.match(post.responses.last.to_s.strip) != 1.0 errors.add_to_base("Sorry, you must change the last submitted word by one letter") end </code></pre> <p>Second, doing exact equality comparison on floating point numbers is almost never a good idea. Because floating point numbers involve approximations, you will sometimes get results that are very close, but not quite exactly equal, to a given number that you are comparing against. It looks like the Amatch library has several different classes for comparing strings; the Sellers class allows you to set different weights for different kinds of edits, but given your problem description, I don't think you need that. I would try using the <a href="http://flori.github.com/amatch/doc/Amatch/Levenshtein.html" rel="nofollow noreferrer">Levenshtein</a> or <a href="http://flori.github.com/amatch/doc/Amatch/Hamming.html" rel="nofollow noreferrer">Hamming</a> distance instead, depending on your exact needs.</p> <p>Finally, if neither of those suggestions work, try writing out to a log or in the response the exact values of <code>title.strip</code> and <code>post.responses.last.to_s.strip</code>, to make sure you are actually comparing the values that you think you're comparing. I don't know the rest of your code, so I can't tell you whether those are correct or not, but if you print them out somewhere, you should be easily able to check them yourself.</p>
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    1. POTrouble with custom validation of Rails app
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    1. USBrian Campbell
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    1. COThanks Brian, that helped. I believe I put the if statement on the same line, but I suppose it got clobbered when I hit submit. The Hamming distance does seem to be a better match. Thanks for those recommendations. In the console: post = Post.find_by_id(1) post.responses.last.to_s =>"#<Response:0x103275db8>" So that's where the problem lay. It wasn't comparing the actual last response text, but the object ID. So I removed the to_s and replaced it with the title attribute of Response: post.responses.last.title I think that did the trick. Thanks for leading me in the right direction!
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