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class AddFeaturedToAlbums < ActiveRecord::Migration
  def change
    add_column :albums, :featured, :boolean, default: false
  end
end

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App.albums.where({ featured: true });
// []

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App.Collections.Albums = Backbone.Collection.extend
  model: App.Models.Album
  url: "/users/2/albums"
  featured: ->
    @where(featured: true)

App.AlbumsListView = Backbone.View.extend
  el: '#featured'
  initialize: ->
    @listenTo @collection, 'sync', @render

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%script
  App.userId = "#{params[:user_id]}"

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.featured-albums.panel
  %ul#featured{ data: { user-id: params[:user_id] } }

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App.Collections.Albums = Backbone.Collection.extend
  model: App.Models.Album
  url: ->
    userId = $('#featured').data('user-id')
    "/users/#{userId}/albums"
  featured: ->
    @where(featured: true)

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App.AlbumItemView = Backbone.View.extend
  tagName: 'li'
  template: _.template "<a href='/users/<%= user_id %>/albums/<%= id %>'><%= title %></a>"
  render: ->
    @$el.html @template @model.attributes
    this

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# app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  …
  before_filter :vary_headers
  …
  private
  
  def vary_headers
    response.headers["Vary"]= "Accept"

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// application.css.sass

.unfeature
  margin-left: 8px

.featured-albums
  padding: 10px
  width: 50%

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events:
  'click .unfeature': 'unfeature'