Hi all,
Here''s another contribution for anyone interested.
In Railscast episode 28, Ryan Bates showed us in_groups_of which
allows you to group array members such as
>> list = [1, 2, 3, 4, 5, 6, 7]
=> [1, 2, 3, 4, 5, 6, 7]
>> list.in_groups_of(3)
=> [[1, 2, 3], [4, 5, 6], [7, nil, nil]]
This allows you to iterate over the groups and, for example, display
a list of things in a tabular format.
1 2 3
4 5 6
7
I thought this was pretty cool, but wanted to go vertically down the
column first, instead of horizontally
1 4 7
2 5
3 6
Well, last night I decided I really needed this vertical grouping,
so ...
module ActiveSupport
module CoreExtensions
module Array
module Grouping
def in_vertical_groups_of(number, fill_with = nil, &block)
collection = dup
per_column = (collection.size.to_f / number).ceil
new_collection = []
(0...per_column).each do |i|
(0...number).each do |multiplier|
offset = i + (per_column * multiplier)
new_collection << (offset < collection.size ? collection
[offset] : (fill_with != false ? fill_with : nil))
end
end
return new_collection.in_groups_of(number, fill_with, &block)
end
end
end
end
end
All this really does is reorders the array then calls in_groups_of.
The only caveat (that I''m aware of right now), is you have to fill
"empty" spots in the array or the column spanning won''t work
right.
So in a case where could do this
>> list.in_groups_of(3, false)
=> [[1, 2, 3], [4, 5, 6], [7]]
in_vertical_groups_of will return
>> list.in_vertical_groups_of(3, false)
=> [[1, 4, 7], [2, 5, nil], [3, 6, nil]]
The ultimate end of this is
@members = Member.find(:all)
...
<table class="wgg_table">
<% @members.in_vertical_groups_of(3) do |group| %>
<tr style="font-size: 80%">
<% group.each do |member| %>
<%= render :partial => ''member'', :locals =>
{:member => member} %>
<% end %>
</tr>
<% end %>
</table>
and then in the _member partial
<td style="width: 125px">
<%= h "#{member.full_name(false)}" if member %>
</td>
or whatever your requirements are. This will display a list of
members in three columns, top to bottom, left to right, like a phone
book.
If anyone discovers something I did poorly or just plain missed,
please let me know. Oh, and I have not done any testing/experimenting
with passing a block. But since that is just getting passed along, I
don''t see why it wouldn''t work.
Peace,
Phillip
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On Jan 2, 2008 2:10 AM, Phillip Koebbe <phillipkoebbe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> > If anyone discovers something I did poorly or just plain missed, > please let me know. Oh, and I have not done any testing/experimenting > with passing a block. But since that is just getting passed along, I > don''t see why it wouldn''t work.Simpler: @members.in_groups_of(3).transpose.each do |group| ... end :-) Regards, George. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On Jan 2, 2008, at 5:59 AM, George wrote:> > On Jan 2, 2008 2:10 AM, Phillip Koebbe <phillipkoebbe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> > wrote: >> >> If anyone discovers something I did poorly or just plain missed, >> please let me know. Oh, and I have not done any testing/experimenting >> with passing a block. But since that is just getting passed along, I >> don''t see why it wouldn''t work. > > Simpler: > > @members.in_groups_of(3).transpose.each do |group| > ... > end > > :-) ><span id="disgust" style="voice: charlie_brown"> Good grief! </span> Thanks, George. That is much simpler. I wish I had known about that two days ago. I could have saved myself an hour or two of digging and testing. :) Peace, Phillip --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
George wrote:> On Jan 2, 2008 2:10 AM, Phillip Koebbe <phillipkoebbe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: >> >> If anyone discovers something I did poorly or just plain missed, >> please let me know. Oh, and I have not done any testing/experimenting >> with passing a block. But since that is just getting passed along, I >> don''t see why it wouldn''t work. > > Simpler: > > @members.in_groups_of(3).transpose.each do |group| > ... > end > > :-) > > Regards, > George.Hi again, George. As it turns out, transpose is not equivalent to in_vertical_groups_of. To illustrate, open script/console and do this:>> list = (1..10).to_a=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]>> list.in_groups_of(2)=> [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]]>> list.in_groups_of(2).transpose=> [[1, 3, 5, 7, 9], [2, 4, 6, 8, 10]] Notice that transpose changed the output from five groups of two to two groups of five. That''s not at all what I wanted. It was just coincidence that it happened to work on my particular example. Now, here''s the output of in_vertical_groups of:>> list.in_vertical_groups_of(2)=> [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]] They are still in five groups of two, but the sorting is different. Peace, Phillip -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On Fri, Jan 04, 2008 at 06:12:15PM +0100, Phillip Koebbe wrote:> George wrote: > > On Jan 2, 2008 2:10 AM, Phillip Koebbe <phillipkoebbe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > >> If anyone discovers something I did poorly or just plain missed, > >> please let me know. Oh, and I have not done any testing/experimenting > >> with passing a block. But since that is just getting passed along, I > >> don''t see why it wouldn''t work. > > > > Simpler: > > > > @members.in_groups_of(3).transpose.each do |group| > > ... > > end > > > > :-) > > > > Regards, > > George. > > Hi again, George. > > As it turns out, transpose is not equivalent to in_vertical_groups_of. > To illustrate, open script/console and do this: > > >> list = (1..10).to_a > => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] > >> list.in_groups_of(2) > => [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]] > >> list.in_groups_of(2).transpose > => [[1, 3, 5, 7, 9], [2, 4, 6, 8, 10]] > > Notice that transpose changed the output from five groups of two to two > groups of five. That''s not at all what I wanted. It was just > coincidence that it happened to work on my particular example. Now, > here''s the output of in_vertical_groups of: > > >> list.in_vertical_groups_of(2) > => [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]] > > They are still in five groups of two, but the sorting is different.class Array def in_vertical_groups_of(n) in_groups_of(size/n).transpose end end> Peace, > Phillip--Greg --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Gregory Seidman wrote:> On Fri, Jan 04, 2008 at 06:12:15PM +0100, Phillip Koebbe wrote: >> > ... >> To illustrate, open script/console and do this: >> coincidence that it happened to work on my particular example. Now, >> here''s the output of in_vertical_groups of: >> >> >> list.in_vertical_groups_of(2) >> => [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]] >> >> They are still in five groups of two, but the sorting is different. > > class Array > def in_vertical_groups_of(n) > in_groups_of(size/n).transpose > end > end > >> Peace, >> Phillip > --GregHi Greg, Wow, that would be nice and concise, if it worked all the time :)>> list = (1..10).to_a=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] Works here...>> n = 2=> 2>> list.in_groups_of(n)=> [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]]>> list.in_vertical_groups_of(n)=> [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]]>> list.in_groups_of(list.size/n).transpose=> [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]] Doesn''t work here...>> n = 3=> 3>> list.in_groups_of(n)=> [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, nil, nil]]>> list.in_vertical_groups_of(n)=> [[1, 5, 9], [2, 6, 10], [3, 7, nil], [4, 8, nil]]>> list.in_groups_of(list.size/n).transpose=> [[1, 4, 7, 10], [2, 5, 8, nil], [3, 6, 9, nil]] nor when n = 4. As much as I''d like a shorter, cleaner way of doing it, it looks like my method will have to suffice for now. Thanks for trying to slim down my code. Peace, Phillip -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On Fri, Jan 04, 2008 at 08:26:35PM +0100, Phillip Koebbe wrote:> > Gregory Seidman wrote: > > On Fri, Jan 04, 2008 at 06:12:15PM +0100, Phillip Koebbe wrote: > >> > ... > >> To illustrate, open script/console and do this: > >> coincidence that it happened to work on my particular example. Now, > >> here''s the output of in_vertical_groups of: > >> > >> >> list.in_vertical_groups_of(2) > >> => [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]] > >> > >> They are still in five groups of two, but the sorting is different. > > > > class Array > > def in_vertical_groups_of(n) > > in_groups_of(size/n).transpose > > end > > end > > > >> Peace, > >> Phillip > > --Greg > > Hi Greg, > > Wow, that would be nice and concise, if it worked all the time :) > > >> list = (1..10).to_a > => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] > > Works here... > > >> n = 2 > => 2 > >> list.in_groups_of(n) > => [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]] > >> list.in_vertical_groups_of(n) > => [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]] > >> list.in_groups_of(list.size/n).transpose > => [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]] > > Doesn''t work here... > > >> n = 3 > => 3 > >> list.in_groups_of(n) > => [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, nil, nil]] > >> list.in_vertical_groups_of(n) > => [[1, 5, 9], [2, 6, 10], [3, 7, nil], [4, 8, nil]] > >> list.in_groups_of(list.size/n).transpose > => [[1, 4, 7, 10], [2, 5, 8, nil], [3, 6, 9, nil]] > > nor when n = 4. > > As much as I''d like a shorter, cleaner way of doing it, it looks like my > method will have to suffice for now. Thanks for trying to slim down my > code.Ah, you just didn''t give full requirements, i.e. what the output should be if the size did not divide evenly. Try this: class Array def in_vertical_groups_of(n) in_groups_of((size.to_f/n).ceil).transpose end end> Peace, > Phillip--Greg --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On Jan 4, 2008, at 1:36 PM, Gregory Seidman wrote:> Ah, you just didn''t give full requirements, i.e. what the output > should be > if the size did not divide evenly. Try this: >In my first message, I said:> This allows you to iterate over the groups and, for example, display > a list of things in a tabular format. > > 1 2 3 > 4 5 6 > 7 > > I thought this was pretty cool, but wanted to go vertically down the > column first, instead of horizontally > > 1 4 7 > 2 5 > 3 6Those were pretty much the requirements.> class Array > def in_vertical_groups_of(n) > in_groups_of((size.to_f/n).ceil).transpose > end > end >This does, in fact, work. Thanks. I''ll replace my looping code with someone else''s looping code :) For anyone following along, you might want to now replace my in_vertical_groups_of with this new one: def in_vertical_groups_of(number, fill_with = nil, &block) return in_groups_of((size.to_f / number).ceil, fill_with, &block).transpose end And then send Greg a +1 email!>> Peace, >> Phillip > --Greg >Until my next poorly contrived contribution to the community... Phillip --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---