Acts-as-readable Rails plugin Issue

I'm using Intridea's Acts as Readable Rails plugin for a messaging system I'm currently building. I've defined my message class accordingly:

class Post < ActiveRecord::Base
  acts-as-readable
end

And everything seems to be working according to plan, but when trying to make the app show unread messages in my message view, I run into problems.

Their example: (I've changed underscores to hyphens due to formatting issues)

bob = User.find_by_name("bob")

bob.readings                      # => []

Post.find_unread_by(bob)          # => [<Post 1>,<Post 2>,<Post 3>...]
Post.find_read_by(bob)            # => []

Post.find(1).read_by?(bob)        # => false
Post.find(1).read_by!(bob)        # => <Reading 1>
Post.find(1).read_by?(bob)        # => true
Post.find(1).users_who_read       # => [<User bob>]

Post.find_unread_by(bob)          # => [<Post 2>,<Post 3>...]
Post.find_read_by(bob)            # => [<Post 1>]

bob.readings                      # => [<Reading 1>]

So it seems that if I wanted to list the number of unread messages sitting in a mailbox (for example Inbox (39) ), I should be able to do something like:

<%= Post.find_unread_by(current-user).count %>

But to no avail. I always seem to get stuck on the simple view issues after everything's set. Any ideas?