Базовый запрос ActiveRecord кажется очень медленным

Question

У меня есть основное действие шоу и набор данных с менее чем 500 объектами.

def show 
    @report = Report.find(params[:id]) 
    @keywords = @report.keywords.order("total_value DESC") 
end 

Я не сделал никакого тестирования или оптимизации производительности, но я не могу понять, почему мое шоу действие настолько медленно с таким небольшим набором данных.

BTW, я использую приложение локально.

Edit: development.log

Started GET "/reports/2" for 127.0.0.1 at 2013-05-16 11:26:33 -0400 
Processing by ReportsController#show as HTML 
    Parameters: {"id"=>"2"} 
    [1m[36mReport Load (0.2ms)[0m [1mSELECT "reports".* FROM "reports" WHERE "reports"."id" = ? LIMIT 1[0m [["id", "2"]] 
    [1m[35mKeyword Load (1.3ms)[0m SELECT "keywords".* FROM "keywords" WHERE "keywords"."report_id" = 2 ORDER BY total_value DESC 
    Rendered reports/show.html.erb within layouts/application (19552.2ms) 
    Rendered layouts/_header.html.erb (0.8ms) 
Completed 200 OK in 19777ms (Views: 19773.0ms | ActiveRecord: 1.5ms) 


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Served asset /bootstrap.js - 304 Not Modified (0ms) 


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Served asset /keywords.js - 304 Not Modified (0ms) 


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Served asset /pages.js - 304 Not Modified (0ms) 


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Served asset /reports.js - 304 Not Modified (0ms) 


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Посмотреть

<table class ="table table-striped"> 
    <tr> 
    <th>Keyword</th> 
    <th>Avg position</th> 
    <th>Total revenue</th> 
    </tr> 

    <% @keywords.each do |keyword| %> 
     <tr> 
     <td><%= keyword.description %></td> 
     <td><%= keyword.avg_position %></td> 
     <td><%= keyword.total_value %></td> 
     </tr> 
    <% end %> 
</table> 

Answer 1

Report.find(params[:id]) 

выше запрос использует primvary ключ вашей базы данных/модели. Это, как правило, самый быстрый запрос, и если его медленная, первая проверка - это посмотреть на вашу модель, чтобы увидеть, есть ли у вас поле «ID»/первичное ключевое слово. второй, я бы проверить «хвост -n 100 журнала/production.log или development.log

Кроме того, закомментируйте следующее заявление и посмотреть, если его cuasing его, а затем изучить, как построить запрос.

@keywords = @report.keywords.all(:order => "total_value DESC", :limit => 5)