help with activerecord, has_many and :order, please

rubyonrails-talk
1

Hi, very much a newbie, so please excuse the basic question.

Here is what I have:

class Author < ActiveRecord::Base   has_many :books end

class Books < ActiveRecord::Base   belongs_to :author end

What I am trying to do is find all Authors and list them in the order of how many books they have. It seems that this should be pretty straight-forward, but it's hard to google for...

Any help greatly apprciated!

thank you, Olia

2

You can try sort method with a block:

Author.find(:all).sort {|x,y| x.books.size <=> y.books.size}

3

Thanks for the reply!

Unfortunately, I need a way to do it in a query, because I need it to be part of pagination.

4

Try this:

Book.find(:all, :select => "author_id, count(id) as book_count", :group => "author_id", :order => "book_count")

Regards, Jorge.