From: Kendall Gifford <zettabyte@...>
Date: 2013-05-17T22:13:31+09:00
Subject: Re: Error in Migration

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On Fri, May 17, 2013 at 12:37 AM, Amarnath Krishnan <lists@ruby-forum.com>wrote:

> I am a RoR newbie. I am getting this error when trying to migrate my 2.x
> project to 3.x project.
> actionpack-3.2.13/lib/action_dispatch/routing/mapper.rb:109:in
> `normalize_path': undefined method `to_sym' for nil:NilClass
> (NoMethodError)
>
> In that line i can see the following code
> options[$1.to_sym]||=/.+/?
>
> why $1.to_sym ends with NilClass error
>

You're getting NoMethodError because $1 in $1.to_sym is nil and nil doesn't
have a #to_sym method.

$1 gets set whenever you #match a string against a regular expression that
has at least one capture group. By the time your line of code gets
executed, you clearly haven't done so.

Also, the question mark at the end of the line as you've show it:

options[$1.to_sym]||=/.+/?

Is invalid (type it into an IRB session after initializing a local variable
"options" to an empty hash and you'll see that the parser things you're
starting a ternary: "condition ? when-true : when-false" expression and
doesn't consider the statement complete. Did you mean to have the "?" after
the "+" _inside_ the regular expression?

So, without more info on what you're trying to get this line of code to do
(what you expect $1 to be at this point, etc.) that's all the help I can
give.

-- 
Kendall Gifford
zettabyte@gmail.com

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<div dir=3D"ltr">On Fri, May 17, 2013 at 12:37 AM, Amarnath Krishnan <span =
dir=3D"ltr">&lt;<a href=3D"mailto:lists@ruby-forum.com" target=3D"_blank">l=
ists@ruby-forum.com</a>&gt;</span> wrote:<br><div class=3D"gmail_extra"><di=
v class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">I am a RoR newbie. I am g=
etting this error when trying to migrate my 2.x<br>
project to 3.x project.<br>
actionpack-3.2.13/lib/action_dispatch/routing/mapper.rb:109:in<br>
`normalize_path&#39;: undefined method `to_sym&#39; for nil:NilClass<br>
(NoMethodError)<br>
<br>
In that line i can see the following code<br>
options[$1.to_sym]||=3D/.+/?<br>
<br>
why $1.to_sym ends with NilClass error<br>
<span class=3D""></span></blockquote><div><br></div><div>You&#39;re getting=
 NoMethodError because $1 in $1.to_sym is nil and nil doesn&#39;t have a #t=
o_sym method.<br><br></div><div>$1 gets set whenever you #match a string ag=
ainst a regular expression that has at least one capture group. By the time=
 your line of code gets executed, you clearly haven&#39;t done so.<br>
<br></div><div>Also, the question mark at the end of the line as you&#39;ve=
 show it:<br><br>options[$1.to_sym]||=3D/.+/?<br><br></div><div>Is invalid =
(type it into an IRB session after initializing a local variable &quot;opti=
ons&quot; to an empty hash and you&#39;ll see that the parser things you&#3=
9;re starting a ternary: &quot;condition ? when-true : when-false&quot; exp=
ression and doesn&#39;t consider the statement complete. Did you mean to ha=
ve the &quot;?&quot; after the &quot;+&quot; _inside_ the regular expressio=
n?<br>
<br></div><div>So, without more info on what you&#39;re trying to get this =
line of code to do (what you expect $1 to be at this point, etc.) that&#39;=
s all the help I can give.<br></div></div><br>-- <br>Kendall Gifford<br>
<a href=3D"mailto:zettabyte@gmail.com">zettabyte@gmail.com</a>
</div></div>

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