Sod will_paginate library

(Apologies if I've duped this -- I'm having trouble creating a ticket in Lighthouse)

I'm using an association extension in one of my models, to help with a per-user hand-rolled tagging setup:

class Tag < ActiveRecord::Base
  has_many :taggings
  has_many :prints, :through=>:taggings, :source=>:print, :uniq=>true do
    def for_user(user)
      find :all, :conditions=>["taggings.user_id = ?", user.id]
    end
  end

When I try to call something like:

@tag = Tag.find_by_title("sometag")
@prints = @tag.prints.for_user(current_user).paginate(:page=>params[:page])

It fails with:

undefined method `to_i' for {=>nil}:Hash

and the trace:

vendor/plugins/will_paginate/lib/will_paginate/collection.rb:16:in `initialize'

So, poking about, I edited /vendor/plugins/will_paginate/lib/will_paginate/collection.rb:16 to say:

 def initialize(page, per_page, total)
      if page.is_a?(Hash)
        page = page[:page]
      end
      @current_page  = page.to_i
      #continues as normal...

Which partially fixed the problem -- for results sets larger than 15. If the results are larger than 15, the pagination does appear -- and works if you click directly on the "2" or "3" links, although the "1" link is not highlighted, and the "next" link points to the current page.

If the results set is under 15, you get this error:

Showing app/views/shared/_printlist.rhtml where line #18 raised:

undefined method `page_count' for []:Array

(line 18 is the will_paginate line)

The relevant trace line points at:

vendor/plugins/will_paginate/lib/will_paginate/view_helpers.rb:41:in `will_paginate'

So, I'm turning it over to you guys!