使用演示

Question

json = JSON.parse(response.body) 
    @games = json['machine-games'] 

    paging = json['paging'] 
    if paging 
     if paging['next'] 
     next_page_query = paging['next'].match(/\?.*/)[0] 
     @next_page = "/machine_games/search#{next_page_query}" 
    end 

    if paging['previous'] 
     previous_page_query = paging['previous'].match(/\?.*/)[0] 
     @previous_page = "/machine_games/search#{previous_page_query}" 
    end 
    end 

以上是從在controller.How顯示方法的一小塊邏輯的做我將其移動到演示者，使得其將保持machine_games JSON響應和提供方法來訪問遊戲和下一頁/上一頁的鏈接（以及它們是否存在）。 {不熟悉使用Presenter模式}

Answer 1

讓我們創建一個演示者，將JSON響應解析爲@games,@next_page和@previous_page。

# app/presenters/games_presenter.rb 

class GamesPresenter 

    attr_reader :games, :next_page, :previous_page 

    def initialize json 
    @games = json['machine-games'] 

    paging = json['paging'] 
    if paging && paging['next'] 
     next_page_query = paging['next'].match(/\?.*/)[0] 
     @next_page = "/machine_games/search#{next_page_query}" 
    end 

    if paging && paging['previous'] 
     previous_page_query = paging['previous'].match(/\?.*/)[0] 
     @previous_page = "/machine_games/search#{previous_page_query}" 
    end 
    end 

end 

現在你的控制器動作應該是這個樣子：

def show 
    # ... 
    @presenter = GamesPresenter.new(json) 
end 

而且你可以在你的看法使用它：

<% @presenter.games.each do |game| %> 
    ... 
<% end %> 

<%= link_to "Previous", @presenter.previous_page %> 
<%= link_to "Next", @presenter.next_page %> 

而且爲了告訴Rails加載應用程序/主持人/高配車型一起目錄/，控制器/，視圖/等內容添加到配置/ application.rb中：

config.after_initialize do |app| 
    app.config.paths.add 'app/presenters', :eager_load => true 
end