On Monday, 15 December 2014 14:59:02 UTC-5, Ruby-Forum.com User wrote:
>
> Hi,
>
>
> I have around 2000 objects to render. Unfortunately the view rendering
> with jbuilder takes very long time, although the objects are small like
> this:
>
>
> center: {lat: 48.8130685274225, lon: 10.0405494495457}
> lat: 48.8130685274225
> lon: 10.0405494495457
> n: "Aalen/Hirtenteich"
> st: null
> sy: null
>
>
> The result query I pass to the view looks like this
> @resorts = Resort.where(:id => resort_ids).includes(:snow_reports)
>
> A resort has many snow_reports. st and sy are fields from snow reports.
>
> the view looks like this:
>
> json.array!(@resorts) do |resort|
> json.cache!("resort_light_#{resort.id}") do
>
> #json.partial! 'json_partials/snow_in_resort', resort: resort
> json.n resort.name
> json.sy resort.try(:snow_reports).last.try(:snow_valley) if
> resort.snow_reports
>
How many snow reports does a typical resort have? I ask because you're
loading *all* of them with the `includes` above, but only using the last
one. If you've got 2000 resorts and each one has 100 reports or so, that
means instantiating 200000 SnowReport objects, and that is not going to be
fast.
--Matt Jones
> json.st resort.try(:snow_reports).last.try(:snow_summit) if
> resort.snow_reports
> json.center do
> json.lat resort.centroid.lat
> json.lon resort.centroid.lon
> end
> end
> end
>
>
> Rendered resorts/find.json.jbuilder (1649.0ms)
> Completed 200 OK in 1889ms (Views: 1593.1ms | ActiveRecord: 77.8ms |
> Solr: 0.0ms)
> In development mode the request takes 5s in chrome to run.
>
> The first thing I ve done to speed up is changing the json gem to
>
> gem 'oj'
> gem 'oj_mimic_json'
>
> It speeds up slightly but not enough. I also tried active model
> serialization wich was about the same time, so I prefer to stick to
> jbuilder since it is convenient to assemble json objects.
> So how can I speed up rendering?
>
> Help is highly appreciated since I am stuck for a week now.
>
> --
> Posted via http://www.ruby-forum.com/.
>
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