Comments on: map_by_method now increasingly more niftier-er. http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/ Ruby makes Rails, Javascript makes Ajax, Dr Nic makes Magic Tue, 16 Mar 2010 14:19:45 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Avram http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/comment-page-1/#comment-194816 Avram Sat, 13 Feb 2010 21:32:38 +0000 http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/#comment-194816 Hello, I'm having a problem with the map_by_method gem. I don't understand why, but when I require it from ~/.irbrc, it does not actually get required - *and* any require statements I have after it also seem to have no effect. However, when I require it manually from a rails console, it works fine. All I am saying in .irbrc is: require 'map_by_method' which is exactly the same thing I say in the console when I do it manually, and it works. Any help would be appreciated. Hello,

I’m having a problem with the map_by_method gem. I don’t understand why, but when I require it from ~/.irbrc, it does not actually get required – *and* any require statements I have after it also seem to have no effect.

However, when I require it manually from a rails console, it works fine.

All I am saying in .irbrc is:
require ‘map_by_method’

which is exactly the same thing I say in the console when I do it manually, and it works. Any help would be appreciated.

]]> By: Dr Nic http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/comment-page-1/#comment-16889 Dr Nic Sun, 15 Apr 2007 20:31:03 +0000 http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/#comment-16889 @ben: yep that'll get you the same thing, and I think the Symbol.to_proc solution you've got there is going into/has gone into Ruby core itself. For me, its too many funny characters (2 brackets, an ampersand, and a colon), and it doesn't extend to mapping 2+ methods on the objects in the array. The upside of the <code>map(&:amount)</code> syntax is you don't need to invoke <code>to_a</code> on the associations. I should get around to fixing that so the association proxy supports the map_by_method idea too. @ben: yep that’ll get you the same thing, and I think the Symbol.to_proc solution you’ve got there is going into/has gone into Ruby core itself.

For me, its too many funny characters (2 brackets, an ampersand, and a colon), and it doesn’t extend to mapping 2+ methods on the objects in the array.

The upside of the map(&:amount) syntax is you don’t need to invoke to_a on the associations.

I should get around to fixing that so the association proxy supports the map_by_method idea too.

]]> By: Ben http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/comment-page-1/#comment-16884 Ben Sun, 15 Apr 2007 20:07:11 +0000 http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/#comment-16884 Perhaps I'm being dull, but can't you just do the first one like: p.account.transfers.map(&:amount) ? Perhaps I’m being dull, but can’t you just do the first one like:

p.account.transfers.map(&:amount)

?

]]> By: Dr Nic http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/comment-page-1/#comment-16869 Dr Nic Sun, 15 Apr 2007 18:19:09 +0000 http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/#comment-16869 @john - dude, we could play "Code Jinx" - for two people who right the same chunk of code :) @john – dude, we could play “Code Jinx” – for two people who right the same chunk of code :)

]]> By: johnpg http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/comment-page-1/#comment-16868 johnpg Sun, 15 Apr 2007 18:14:25 +0000 http://drnicwilliams.com/2006/10/26/map_by_method-now-increasingly-more-niftier-er/#comment-16868 Oh crap, I come up with one good idea and you had to beat me to it. :-( http://dashing.com/blog/2006/12/09/super_easy_collect_for_activerecord_arrays Keep up the great work! Cheers, John Oh crap, I come up with one good idea and you had to beat me to it. :-(

http://dashing.com/blog/2006/12/09/super_easy_collect_for_activerecord_arrays

Keep up the great work!

Cheers,
John

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