Railscasts - in_groups

1. eTrueke May 07, 2007 at 04:56

Hi!

First of all, congratulations.

And second, I've a suggestion; Why not to use a ul,li list? We can write CSS to display it as a columns and the MVC will be respected.

Report as Spam

2. Jengibre May 07, 2007 at 05:58

Extremely useful!

Report as Spam

3. InMan May 07, 2007 at 07:35

Hey Ryan.
Just for info: Your add comment labels have mistype.
<label for"comment_name" class="required">Name:</label>
Should be for="comment_name"

Thanks for railscast :).

Report as Spam

4. Rebort May 07, 2007 at 07:57

I am addicted to your site. Great tips once again!

I remember creating this sort of fucntionality in PHP about eight years ago -- pre CSS days and all -- and it was a bit of a nightmare.

What's the advantage, though, of using Rails for this instead of formatting with CSS?

Report as Spam

5. Slaptijack May 07, 2007 at 08:01

Although it might be easier to accomplish this particular task via CSS, I think it's also a simple way to show the functionality of the in_groups_of() method.

Report as Spam

6. Ryan Bates May 07, 2007 at 08:10

@InMan, thanks. I'll fix that.

@eTrueke & Rebort, if CSS will work for you, then that is definitely preferred. But sometimes you need the exact behavior only a table can provide, where you need everything to line up and you don't want the columns to be fixed width. I'm no CSS guru so I may just be missing something.

@Slaptijack, right, this was more of a way to show off in_groups_of then to push tables. You might, for example, need to use it while generating a PDF document where the rows and columns need to be strictly defined.

Report as Spam

7. Tobias May 07, 2007 at 08:31

I enjoy watching your shows. Thanks from Germany!

Report as Spam

8. jeroen May 07, 2007 at 10:23

your screencasts are short, extremely useful, understandable and kinda cool even.

Report as Spam

9. Croaker May 07, 2007 at 13:43

Thanks for your good work! Your screencasts are a real time saver.

Report as Spam

10. chineseGuy May 08, 2007 at 22:07

perfect!
完美!

Report as Spam

11. Wincent Colaiuta May 09, 2007 at 07:48

In the last example where you use in_groups_of(4, false) does that yield valid X/HTML? ie. the last table row will not have as many TD elements as the previous rows. Don't know if that's allowed or not (it may be).

Report as Spam

12. Benjie May 14, 2007 at 12:08

i've got the same question Wincent. I'm wondering if there isn't a way to conditionally act upon the nil objects.
I'm really interested in learning more about this technique.
Here's what I want to do:

http://www.scubadorag.com/coco/links/USAlinks.asp

We will be moving to a rails host. I've thought about doing it with modulo, but I haven't been able to wrap my head around it yet.

Report as Spam

13. Ryan Bates May 14, 2007 at 15:01

Hmm, I'm not sure if it's valid XHTML or not. If not, you could do a nil check inside the td element like this:

<% for task in tasks_row %>
  <td>
    <% unless task.nil? %>
      ...
    <% end %>
  </td>
<% end %>

Thanks for bringing that up, good question.

Report as Spam

14. Phillip Dec 04, 2007 at 18:08

I'm a little late getting in this game, but I've got a question I haven't been able to find the answer to. Your example displays the groups horizontally. Is there a way to display them vertically? I'd like to use this method in displaying a directory and I'd like to go down the columns first, then left to right. And since I'm not a CSS guru either, I thought I'd do it with tables.

Thanks.

Report as Spam

15. cover Dec 24, 2007 at 15:55

@Phillip:
Probably the easier way to do that with a table is to use something like this:

(I don't know if it's possible to have each element in a cell, probably yes, but will be more complicated)

Report as Spam

16. Phillip Jan 01, 2008 at 11:13

Well, I decided that I needed an actual in_vertical_groups_of. I made a post over at ruby-forum about it.

http://www.ruby-forum.com/topic/137230

Peace,
Phillip

Report as Spam

17. Lou Jan 14, 2008 at 12:03

@Phillip

I think that Array::transpose is what you want. That should just invert the matrix and you should be good to go.

--
Lou

Report as Spam

18. ben Sep 03, 2008 at 11:24

Using transpose for top-down layout:

<% n = 3 %>
<% a.in_groups_of((a.length/n).ceil).transpose.each do |row| %>

taken from

http://ruby-on-the-interrails.blogspot.com/2008/09/method-of-day-arrayingroupsof.html

Report as Spam

19. dafs Aug 05, 2009 at 23:18

Following the initial [URL=http://www.realpoor.co.uk]wow gold[/URL] White House [URL=http://www.realpoor.co.uk]buy wow gold[/URL] Forum on [URL=http://www.realpoor.co.uk]wow leveling[/URL] Health Reform [URL=http://www.realpoor.co.uk]wow gold cheap[/URL], and then [URL=http://www.wowgoldbag.co.uk]wow gold[/URL] the regional [URL=http://www.wowgoldbag.co.uk]buy wow gold[/URL] forums across [URL=http://www.wowgoldbag.co.uk]wow power leveling[/URL] the country, [URL=http://www.wowgoldbag.co.uk]cheapest wow gold[/URL] we began [URL=http://www.mmotao.co.uk]wow gold[/URL] holding what [URL=http://www.mmotao.co.uk]world of warcraft gold[/URL] we called[URL=http://www.mmotao.co.uk]buy wow gold[/URL] Health Care[URL=http://www.mmotao.co.uk]cheap wow gold[/URL] Stakeholder [URL=http://www.mmotao.co.uk]wow leveling[/URL] Discussions [URL=http://www.srogold.co.uk]wow gold[/URL] here at the [URL=http://www.srogold.co.uk]world of warcraft gold[/URL] White House [URL=http://www.srogold.co.uk]buy wow gold[/URL]. Keeping with [URL=http://www.srogold.co.uk]cheap wow gold[/URL] the President’s [URL=http://www.srogold.co.uk]wow power leveling[/URL] dedication to [URL=http://www.srogold.co.uk]wow powerleveling[/URL] transparency in [URL=http://www.srogold.co.uk/the-lord-of-the-ring-eu-gold-1140.html]Lord of the Rings Online Gold[/URL] the health [URL=http://www.srogold.co.uk/the-lord-of-the-ring-eu-gold-1140.html]LOTRO Gold[/URL] reform process [URL=http://www.srogold.co.uk/the-lord-of-the-ring-eu-gold-1140.html]LOTR Gold[/URL], we streamed [URL=http://www.srogold.co.uk/fly-for-fun-gold-1517.html]fly for fun penya[/URL] these meetings [URL=http://www.srogold.co.uk/fly-for-fun-gold-1517.html]flyff penya[/URL] live here [URL=http://www.srogold.co.uk/fly-for-fun-gold-1517.html]buy flyff gold[/URL] at WhiteHouse [URL=http://www.srogold.co.uk/final-fantasy-xi-gold-11.html]Final Fantasy XI gil[/URL].gov.It took [URL=http://www.srogold.co.uk/final-fantasy-xi-gold-11.html]ffxi gil[/URL] quite a bit of [URL=http://www.srogold.co.uk/warhammer-online-eu-gold-2554.html]buy Warhammer gold[/URL] processing, [URL=http://www.srogold.co.uk/warhammer-online-eu-gold-2554.html]Warhammer gold[/URL] but we’[URL=http://www.srogold.co.uk/ever-quest-2-gold-1257.html]EverQuest 2 gold[/URL] re pleased to [URL=http://www.srogold.co.uk/ever-quest-2-gold-1257.html]eq2 plat[/URL] post the [URL=http://www.srogold.co.uk/dofus-gold-1482.html]dofus kamas[/URL] video of eight [URL=http://www.srogold.co.uk/dofus-gold-1482.html]kamas dofus[/URL] of these meetings [URL=http://www.srogold.co.uk/runescape-gold-1518.html]runescape money[/URL] below on a [URL=http://www.srogold.co.uk/runescape-gold-1518.html]runescape gold[/URL] wide variety [URL=http://www.tbcgold.co.uk]wow gold[/URL] of subjects. All [URL=http://www.tbcgold.co.uk]world of warcraft gold[/URL] of them were [URL=http://www.tbcgold.co.uk]buy wow gold[/URL] very interesting [URL=http://www.tbcgold.co.uk]cheap wow gold[/URL] conversations [URL=http://www.tbcgold.co.uk]wow power leveling[/URL], and once [URL=http://www.tbcgold.co.uk]wow powerleveling[/URL] we got the technology [URL=http://www.tbcgold.co.uk/the-lord-of-the-ring-eu-gold-1140.html]Lord of the Rings Online Gold[/URL] up and [URL=http://www.tbcgold.co.uk/the-lord-of-the-ring-eu-gold-1140.html]LOTRO Gold[/URL] running we even [URL=http://www.tbcgold.co.uk/the-lord-of-the-ring-eu-gold-1140.html]LOTR Gold[/URL] found ways to include [URL=http://www.tbcgold.co.uk/fly-for-fun-gold-1516.html]fly for fun penya[/URL] feedback [URL=http://www.tbcgold.co.uk/fly-for-fun-gold-1516.html]flyff penya[/URL] from our online [URL=http://www.tbcgold.co.uk/fly-for-fun-gold-1516.html]buy flyff gold[/URL] chats in [URL=http://www.tbcgold.co.uk/final-fantasy-xi-gold-11.html]Final Fantasy XI gil[/URL] the meetings [URL=http://www.tbcgold.co.uk/final-fantasy-xi-gold-11.html]>ffxi gil[/URL]. You can read more [URL=http://www.tbcgold.co.uk/warhammer-online-eu-gold-2554.html]buy Warhammer gold[/URL] about the President’s [URL=http://www.tbcgold.co.uk/warhammer-online-eu-gold-2554.html]Warhammer gold[/URL] eight health [URL=http://www.tbcgold.co.uk/ever-quest-2-gold-1257.html]EverQuest 2 gold[/URL] insurance consumer [URL=http://www.tbcgold.co.uk/ever-quest-2-gold-1257.html]eq2 plat[/URL] protections here [URL=http://www.tbcgold.co.uk/dofus-gold-1481.html]dofus kamas[/URL], and figure [URL=http://www.tbcgold.co.uk/dofus-gold-1481.html]kamas dofus[/URL] out how reform will [URL=http://www.tbcgold.co.uk/runescape-gold-1517.html]Runescape Money[/URL] directly affect you and [URL=http://www.tbcgold.co.uk/runescape-gold-1517.html]Runescape gold[/URL] your family.

Report as Spam

20. wkrhui Oct 22, 2009 at 19:13

the Nobel <a href="http://www.7daysprinting.com">plastic card manufacturers</a> Peace Committee and the world as peace-loving people, plastic card manufacturers has tired of a belligerent United States. Obama at this point than the plastic card manufacturers previous president, to ease a lot of attitude, at least do not see plastic card manufacturers his warlike situation. Therefore, in the eyes of the Nobel Peace Committee, plastic card manufacturers

Obama of course, <a href="http://www.7daysprinting.co.uk">Eco-friendly printing</a> brought peace to the world. The "Peace Prize" is Eco-friendly printing not so much Obama's praise, but rather that of the former American presidents, especially Bush's denial. In other words, an American president, as long as he bad war, Eco-friendly printing it means that brought peace to the world, it would give him "peace prize" bar. The majority of Eco-friendly printing people in the world, the eyes, of course, is not convincing, and it is Eco-friendly printing caused by vibration of the reasons for this news.

Connaught %3

Report as Spam

21. wkrhui Oct 22, 2009 at 19:13

the Nobel <a href="http://www.7daysprinting.com">plastic card manufacturers</a> Peace Committee and the world as peace-loving people, plastic card manufacturers has tired of a belligerent United States. Obama at this point than the plastic card manufacturers previous president, to ease a lot of attitude, at least do not see plastic card manufacturers his warlike situation. Therefore, in the eyes of the Nobel Peace Committee, plastic card manufacturers

Obama of course, <a href="http://www.7daysprinting.co.uk">Eco-friendly printing</a> brought peace to the world. The "Peace Prize" is Eco-friendly printing not so much Obama's praise, but rather that of the former American presidents, especially Bush's denial. In other words, an American president, as long as he bad war, Eco-friendly printing it means that brought peace to the world, it would give him "peace prize" bar. The majority of Eco-friendly printing people in the world, the eyes, of course, is not convincing, and it is Eco-friendly printing caused by vibration of the reasons for this news.

Connaught %3

Report as Spam

22. Victor Yoalli Nov 21, 2009 at 13:18

Great railcast as always.
Just reported spam as promise.

Thanks

Report as Spam

23. LouisVuittonbags Jan 22, 2010 at 19:23

Thanks Ryan for the quick reply. And yes, you were right. I needed to add in values for my datetimes into my fixtures.

Report as Spam

24. LouisVuitton bags Jan 22, 2010 at 19:28

f ef erfew fwefwefew order skelaxin from canadian pharmacy

Report as Spam