When upgrading a legacy Rails app that has buttons/links that trigger raw ajax instead of remote: true for making javascript format requests, adding remote: true can make things simpler.
After the upgrade to Rails 5+ is done, look for:
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# Gemfile
gem 'jquery-rails'
If it’s not present, then add this gem and run
bundle install on your terminal.
Look for require jquery and jquery-ujs files in app/assets/javascripts/application.js. If they are not present, add these lines:
If you want to use jQuery 1, you can require jquery:
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// app/assets/javascripts/application.js
//= require jquery
//= require jquery_ujs
If you want to use jQuery 2, you can require jquery2 instead:
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// app/assets/javascripts/application.js
//= require jquery2
//= require jquery_ujs
And if you want to use jQuery 3, you can require jquery3:
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// app/assets/javascripts/application.js
//= require jquery3
//= require jquery_ujs
If you are running Rails 5.1 and up, and if you have included
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// app/assets/javascripts/application.js
//= require rails-ujs
then jquery_ujs is not needed anymore. Instead add:
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// app/assets/javascripts/application.js
//= require jquery
Finally, make sure that application.html.erb contains the following line as well:
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<%= javascript_include_tag "application" %>
Now remote: true is enabled in the application!