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POCan't use variable for basic operations in Nanoc
 

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  1. POCan't use variable for basic operations in Nanoc
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    <p>I got a quite annoying problem tonight, and maybe someone here will be able to help me.</p> <p>I'm building a static blog with nanoc, and currently making some helpers for next/previous articles (I included some tests I made and the return):</p> <pre class="lang-ruby prettyprint-override"><code># lib/helpers.rb include Nanoc3::Helpers::Blogging include Nanoc3::Helpers::LinkTo # Returns a link to the next article # If the article in param is the most recent, returns nothing def next_article article articles = sorted_articles # returns an array of article ordered by date pos = articles.index(article) # returns the expected integer pos.class # returns Fixnum pos.nil? # returns false pos + 1 # NoMethodError: undefined method `+' for nil:NilClass return if pos.zero? # NoMethodError: undefined method `zero?' for nil:NilClass link_to(articles[pos+1][:title], articles[pos+1]) # Fails too, obviously end </code></pre> <p>I have absolutely no idea of why I can't use the "pos" variable, but can still perform some read on it. If anyone has an insight, I'll take it. Thanks in advance !</p> <p>(I use ruby-1.9.3p194, with rvm, on OSX Lion, if it may have any relation)</p> <p>Update : I should have precised that the returned value for pos is the expected value when just read. Strangely enough, setting </p> <pre><code>pos = articles.index(article).to_s.to_i </code></pre> <p>seems to work though. I just don't understand how &amp; why it happens.</p> <pre><code>#layout/post_navigation.haml .post_navigation .next =next_article @item </code></pre>
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    1. USFabPelletier
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    1. COI don't think there's enough info to help, it looks like it should work. There are only two explanations I can think of. either you made a mistake and think that `pos.class` returns `Fixnum` (maybe it returns Fixnum for one article, but nil for another -- perhaps the last one), or there's some devious trickery going on here (e.g. overriding the #class method). Without being able to see articles and pos, I can't really provide any more relevant info. An example that reproduces the problem would be helpful.
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      1. USJoshua Cheek
    2. COI've edited the question to provide a bit more info. As the code really is vanilla, I don't really know how to provide more of an example however.
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    3. COI’m following Joshua Cheek here… I also think that perhaps pos has a different value on different runs. The `.to_s.to_i` “works” because `nil.to_s.to_i == 0`, but that is probably not what you intended to happen.
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      1. USddfreyne
 

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