ActiveRecord两个表desc命令记录？

Question

我在bboy.rb模型中声明了has_many：rate。现在我想输出bboys表匹配条件中的所有记录。这是：根据他们收到的维度明星数量，按降序排序bboy记录：基础。

到目前为止，我在我的ActiveRecord排序查询中使用desc顺序进行维度：基础： @bboys_foundation = Bboy.rates.where（维度：'基础'）。？

在bboys / index.html.erb中：

<ul class="dropdown-menu">
     <li><a href="?sort=foundation">Foundation</a></li>
     <li><a href="?sort=originality">Originality</a></li>
     <li><a href="?sort=dynamics">Dynamics</a></li>
     <li><a href="?sort=Execution">Execution</a></li>
     <li><a href="?sort=Battle">Battle</a></li>
     <li><a href="?sort=Votes">Votes</a></li>
        </ul>

在bboys_controller索引方法中：

if params[:sort].present?
    sort_input = ['foundation', 'originality', 'dynamics', 'execution', 'battle', 'votes']
    @foundation = if sort_input[0].include?

    end
    @originality = if sort_input[1].include?

    end
    @dynamics = if sort_input[2].include?

    end
    @execution = if sort_input[3].include?

    end
    @battle = if sort_input[4].include?

    end
    @votes = if sort_input[5].include?

    end

db schema：

ActiveRecord::Schema.define(version: 20140331112614) do

  create_table "bboys", force: true do |t|
    t.string   "name"
    t.string   "crew"
    t.string   "country"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.string   "avatar_file_name"
    t.string   "avatar_content_type"
    t.integer  "avatar_file_size"
    t.datetime "avatar_updated_at"
  end

  create_table "rates", force: true do |t|
    t.integer  "rater_id"
    t.integer  "rateable_id"
    t.string   "rateable_type"
    t.float    "stars",         null: false
    t.string   "dimension"
    t.datetime "created_at"
    t.datetime "updated_at"
  end