Ruby on Rails: how to sort data in an array of active record objects right before iterating?

Question

What is the best way to sort an array of Active Record objects by by a field?

This array is a field of an object, link_pages, and I want it sorted by the field "sequence"

<% @menu_bar.link_pages.each do |lp| %>
                <li id="page_<%= lp.id%>" class="ui-state-default">
                  <span class="ui-icon ui-icon-arrowthick-2-n-s"></span>

                  <font size=5><%= lp.name %></font> | 
                  <%= link_to "remove",
                         :controller => "admin/menu_bars",
                         :action => :remove_page_from_menu,
                         :page => lp.id,
                         :id => @menu_bar.id %>
                </li>
          <% end %>

Maybe there is a way to do @menu_bar.link_pages.sort_by_sequence.each do, which would be slick, but I just don't know.

version 2.3.8 I think. Def not 3

NullVoxPopuli
– NullVoxPopuli

2010-12-27 00:21:55 +00:00
Commented Dec 27, 2010 at 0:21 — NullVoxPopuli
– NullVoxPopuli, Commented Dec 27, 2010 at 0:21

DigitalRoss · Accepted Answer · 2010-12-27 00:24:57Z

5

@menu_bar.link_pages.sort_by { |e| e.sequence }.each do |lp|
  . . .

answered Dec 27, 2010 at 0:24

DigitalRoss

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1 Comment

Epigene Over a year ago

@menu_bar.link_pages.sort_by &:sequence.each do |lp| is the shorthand to_proc way. See also this SO discussion

kikito · Accepted Answer · 2010-12-27 00:40:19Z

2

Is link_pages really an array of activerecord objects?

What happens if you add this in the view?

<%= debug @menu_bar.link_pages.class %>

Two things can happen. It can print "Array" or it can print "ActiverecordThing" (something similar to that, definitively not Array).

If you really have an Array, use DigitalRoss' solution. If you have an "ActiverecordSomething", then, create a named_scope, so you can reuse easily:

# Assuming that your model name is "Page"
class Page < ActiveRecord::Base
  ...
  named_scope :sorted_by_sequence, :order => 'pages.sequence ASC'
  ...
end

Then you can do:

<% @menu_bar.link_pages.sorted_by_sequence each do |lp| %>

answered Dec 27, 2010 at 0:40

kikito

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