How To Perform Some Task After View Render Using Threads In Rails
Posted by Weston Ganger
I wanted an easy way to run some expensive tasks after my controller rendered the view so that the user can continue on while the work is done. While most of the time you can use ActiveJob or something to do this, this technique can come in handy.
Turns out we can easily do this by creating a new Thread. Here I show using with render or redirect_to
class PostsController < ApplicationController def show @post = Post.find(params[:id]) render Thread.new do my_expsenive_method(@post) Thread.exit end end def update @post = Post.find(params[:id]) @post.update_attributes(post_params) redirect_to action: :index Thread.new do my_expsenive_method(@post) Thread.exit end end end
This works like a charm however this technique should only be used in non-critical code because Threads have many quirks to them. For example you will not easily be able get any data back from this new thread and it also will not show any errors to your users if it fails.
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