Hi Simon,<div><br></div><div>It is a quite interesting problem. What I suspected were ...</div><div><br></div><div>1) Multithread issue</div><div>Daniel pointed out already and you seemed confident that it is not the issue.</div>
<div><br></div><div>2) Error happened different place.</div><div>e.g.</div><div>class Question</div><div> def background</div><div> return @something.background # <= NoMethod error @something is nil here</div><div>
end</div><div>end</div><div><br></div><div>I know that unless you are bit careless, you wouldn't miss the backtrace. However there might be a situation stack trace is not clear when the background method is implemented with some kinds of meta programming trick.</div>
<div><br></div><div>I could not get any other idea apart from abobe for now. I would output log to get more information.</div><div><br></div><div>e.g.</div><div><br></div><div><div><font class="Apple-style-span" face="'courier new', monospace">def page_description</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace"> dump = @question.inspect</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> begin</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> case</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace"> when @question then @question.background # exception raised here</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> <snip other cases></font></div>
<div><font class="Apple-style-span" face="'courier new', monospace"> end</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> rescue NoMethodError=>e</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> <a href="http://logger.info">logger.info</a> "Gotcha!!!!"</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace"> <a href="http://logger.info">logger.info</a> "BEFORE: #{dump}</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> <a href="http://logger.info">logger.info</a> "AFTER: #{@question.inspect}"</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace"> <a href="http://logger.info">logger.info</a> "backtrace: #{e.backtrace}"</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> <a href="http://logger.info">logger.info</a> "exception: #{e.message}"</font></div>
<div><font class="Apple-style-span" face="'courier new', monospace"> raise e</font></div><div><font class="Apple-style-span" face="'courier new', monospace"> end</font></div><div><font class="Apple-style-span" face="'courier new', monospace">end</font></div>
</div><div><br>Maybe we have to wait another one week, though, I am interested in what it tells.</div><div><br></div><div><br></div><div>Tatsuya</div><div><a href="http://twitter.com/ono">twitter.com/ono</a></div><div><br>
<div class="gmail_quote">On 3 August 2011 12:28, Jordi Noguera Leon <span dir="ltr"><<a href="mailto:jordinoguera83@gmail.com">jordinoguera83@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
I'd rather use:<div><br></div><div>def some_other_method</div><div> return foo.whatever if foo</div><div> return bar.whatever if bar</div><div> "some message"</div><div>end</div><div><div></div><div class="h5">
<div><br><br><div class="gmail_quote">
On 3 August 2011 12:23, Viktor Tron <span dir="ltr"><<a href="mailto:viktor.tron@gmail.com" target="_blank">viktor.tron@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
yes with no value, case becomes a concise way of writing if .. elsif .. elsif conditionals<br>
since simon's code is of this type, the bug he gets is a bug you expect with the<br>
case nil variant unless somewhere case is redefined to fall back to nil with no args<br>
Simon, is this not the 'case'? :)<br>
<br>
a little simplified irb for you:<br>
<br>
ruby-1.9.2-p180 :001 > case nil when nil then true else false end<br>
=> true<br>
ruby-1.9.2-p180 :002 > case when nil then true else false end<br>
=> false<div><div></div><div><br>
<br>
<br>
On Wed, 03 Aug 2011 12:15:38 +0100, Tom Stuart <<a href="mailto:tom@therye.org" target="_blank">tom@therye.org</a>> wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
On 3 Aug 2011, at 12:12, Matthew Rudy Jacobs wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
On 3 August 2011 12:09, Tom Stuart <<a href="mailto:tom@therye.org" target="_blank">tom@therye.org</a>> wrote:<br>
<br>
See page 141 of the pickaxe for this use of case.<br>
<br>
Cheers,<br>
<br>
Tom<br>
<br>
Please enlighten me, then.<br>
What's the usecase?<br>
<br>
Have never seen this done.<br>
</blockquote>
<br>
According to the Pickaxe '[this] form is fairly close to a series of if statements; it lets you list a series of conditions and execute a statement corresponding to the first one that's true."<br>
<br>
The code example there is:<br>
<br>
case<br>
when <a href="http://song.name" target="_blank">song.name</a> == "Misty"<br>
puts "Not again!"<br>
when song.duration > 120<br>
puts "Too long!"<br>
when Time.now.hour > 21<br>
puts "It's too late"<br>
else<br>
song.play<br>
end<br>
<br>
It's pretty ugly, but it's valid Ruby and has nothing to do with the more usual use of case for comparison with === against multiple values.<br>
<br>
Cheers,<br>
<br>
Tom<br>
<br>
</blockquote>
<br>
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