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plurals

PO
primarykey
Id
7477132
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-09-19T20:51:39.600
FavoriteCount
0
LastActivityDate
2011-09-19T21:07:54.343
LastEditDate
2011-09-19T21:07:54.343
LastEditorUserId
0
OwnerUserId
0
ParentId
7477036
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
user166390
text
Body
The issue is that a <code>product</code> is <code>nil</code>: <blockquote> <blockquote> undefined method 'page_url' for nil:NilClass". Solution: </blockquote> </blockquote> (It has nothing to do with <code>page_url</code> maybe returning <code>nil</code>.) Make sure <code>product</code> can't be <code>nil</code>: but be wary that this may be a deeper issue. In any case, "fixing" this issue is easy to deal with. Consider either using a collection restriction (such as <a href="http://www.ruby-doc.org/core/classes/Enumerable.html#M001489" rel="nofollow">Enumerable#reject</a>): <pre><code>@all_products.reject(&:nil?).each do { ... } </code></pre> The above uses the <a href="http://www.sitepoint.com/insta-block-with-symbolto_proc/" rel="nofollow">Symbol#to_proc "Rails magic"</a>, but could just as easily have been <code>{|x| x.nil?}</code> as the restriction. The downside is it's not practical to use this for a "no URL" condition per-product although <a href="http://www.ruby-doc.org/core/classes/Enumerable.html#M001496" rel="nofollow">Enumerable#partition</a> could help with that: use the right tool for the job. Another solution is to expand the conditional check itself: <pre><code>if product && product.page_url("en_US") # yay else # uhm end </code></pre> The short-circuit nature of <code>&&</code> will ensure <code>page_url</code> is only invoked upon a truthy value (which excludes <code>nil</code>). I also took the liberty of assuming <code>page_url</code> can't return <code>false</code> as I find this makes the intent more clear. Happy coding.
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1. POProtecting against an undefined chained method
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1. POProtecting against an undefined chained method
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