定制收集路径的polymorphic_path

resources :documents do
  collection do
    post :filter
  end
end

class Document < ActiveRecord::Base
  belongs_to :documentable, :polymorphic => true
end

class User < ActiveRecord::Base
  has_many :documents, :as => :documentable
end

class DocumentsController < ApplicationController
  def index
    # not important
  end

  def filter
    # not important
  end
end

polymorphic_path([@user, Document])

filter_polymorphic_path([@user, Document])

resources :users do
  resources :documents do
    collection do
      post :filter
    end
  end
end

polymorphic_path([@user, Document], :action => \'filter\')

/users/:user_id/documents/filter

polymorphic_path([@user, Document], :action => \'filter\', :sort_order => \'this-order\')

/users/:user_id/documents/filter?sort_order=this-order

polymorphic_path([:filter, @user, Document])

polymorphic_path([:filter, @user, :documents])
polymorphic_path([:filter, @user, Document.new])

polymorphic_path([:filter, @user, Document], :q => \'keyword\')

= link_to \"Documents\", [[:filter, @user, :documents], :q => \'keyword\']