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Brian Roisentul
Brian Roisentul

Reputation: 4740

Dynamically divide array in several columns

I'm working in Ruby on Rails 2.3.8 and I've got a collection of categories. So, I would like to list them in three columns per row, in groups of 10, and to have as many rows as needed. The ammount of categories can change, so the functionality should be dynamic.

Is there a "rails way" to accomplish this? or which is the best way to do it?

Upvotes: 1

Views: 285

Answers (2)

dmcnally
dmcnally

Reputation: 771

Take a look at the following railscasts episode:

http://railscasts.com/episodes/28-in-groups-of

The "in_groups_of" method should be exactly what you require:

>> [1,2,3,4,5,6,7].in_groups_of(2, false)
=> [[1, 2], [3, 4], [5, 6], [7]]

The documentation for in_groups_of can be found at:

http://railsbrain.com/api/rails-2.3.2/doc/index.html?a=M001423&name=in_groups_of

Upvotes: 3

klew
klew

Reputation: 14967

Don't know if it is "rails way", but for sure it is "my way" ;)

# in controller
@categories = Category.all

# in view
<table>
  <% @categories.each_with_index do |cat, index| %>
    <%= "<tr>" if index % 30 == 0 %>
    <%= "<td>" if index % 10 == 0 %>
    <%= cat.name %>
    <%= "</td>" if (index + 1) % 10 == 0 || index + 1 == @categories.size %>
    <%= "</tr>" if (index + 1) % 30 == 0 || index + 1 == @categories.size %>
  <% end %>
</table>

If you will switch to Rails 3, you have to add raw before putting any HTML tag inside <%= %>.

Upvotes: 1

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