预加载数据以加快视图加载时间 - 导轨

我正在研究导轨加速加载时间的技巧。我现在正在处理一个页面，在渲染时渲染大量数据。我试图逐步通过每个负载，看看我是否可以优化时间。预加载数据以加快视图加载时间 - 导轨

我现在的问题是这样的;

(5.4ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23022]] 
    (4.4ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23023]] 
    (4.2ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23024]] 
    (6.0ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23029]] 
    (7.1ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23121]] 
    (6.0ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23180]] 
    (4.2ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23229]] 
    (4.2ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23250]] 
    (6.6ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23254]] 
    (4.4ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23255]] 
    (4.0ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23259]] 
    (6.5ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23154]] 
    (6.6ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23177]] 
    (5.1ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23201]] 
    (4.2ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23221]] 
    (4.1ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23232]] 
    (7.9ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23235]] 
    (4.3ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23237]] 
    (4.1ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23238]] 
    (5.9ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23248]] 
    (7.8ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23295]] 
    (6.8ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23119]] 
    (4.2ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23123]] 
    (4.1ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23178]] 
    (7.9ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23231]] 
    (4.4ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23239]] 
    (4.3ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23240]] 
    (6.4ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23241]] 
    (5.1ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23243]] 
    (6.7ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23245]] 
    (4.3ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23247]] 
    (4.2ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23249]] 
    (6.9ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23251]] 
    (4.4ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23256]] 
    (4.2ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23257]] 
    (6.5ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23275]] 
    (6.4ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23350]] 
    (5.0ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23272]] 
    (4.2ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23296]] 
    (4.0ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23401]] 
    (8.8ms) SELECT COUNT(*) FROM "attendees" WHERE "attendees"."rsvp_id" = $1 [["rsvp_id", 23347]]

我越来越从这个代码：

def number_attending 
    rsvp.attendees.count 
end

所以回函有很多人参加。我在这里调用这个方法。

<% rsvps.each do |rsvp| %> 
<span class="event-response__indicator event-response__indicator--guests" title="<%= rsvp.number_attending %> Guests"> 
<% end %>

所以问题是。我想不必在页面加载时遍历每个rsvp和参加者。有没有预加载数据的方法？像Eagerloading？如果是这样，我怎么能用给出的信息来实现它？

来源

2017-04-19 Bitwise

检出this link, 这是专门用于避免计数的n + 1查询。

此解释执行加入查询或创建相同的视图

来源

2017-04-19 03:44:38

-1

那么，你没有显示你如何查询rsvps，所以我会认为它是rsvps = Rsvp.all。您可以添加includes方法，所以它会像这样rsvps = Rsvp.includes(:attendees).all。

此外，我不确定是否可以避免查询时运行此行rsvp.attendees.count。我遇到了一些情况，其中count方法触发了一个查询，但size方法没有，所以你可能不得不将这条线替换为rsvp.attendees.size。

来源

2017-04-19 02:24:03

我可以知道为什么downvote？ –

预加载数据以加快视图加载时间 - 导轨

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