```ruby
require "pliable/version"
require "pliable/ply"

module Pliable
  def self.included(base)
    base.send(:include, Pliable::Ply)
    super
  end
end
```

Add ply relation to plaible
user
```ruby
require "pliable/version"
require "pliable/ply"
require "pliable/ply_relation"

module Pliable
  def self.included(base)
    base.send(:include, Pliable::Ply)
    base.send(:include, Pliable::PlyRelation)
    super
  end
end
```
assistant