Ruby on Rails

  1. Extending build-in ruby classes in Rails

    It's a useful skill to extend build-in ruby classes in Rails. And it turns out to be fairly straightforward. We're going to use an example to explain how to do that. Use case: we have an array of scheduled jobs, work orders and events. We'…
    on Ruby Ruby on Rails - Comments

  2. Sidekiq Server Side Middleware

    Our team recently has converted all our background jobs from delayed job to Sidekiq. There are many things that we have learned along the way. One of the useful tools is to utilize sidekiq middleware to manipulate the job when pushing the job to a redis server or right before…
    on Ruby Ruby on Rails Sidekiq - Comments

  3. Sidekiq WebUI Access Control

    Sidekiq built-in webui is simple and useful. We would like to take the advantage of that instead of reinventing the wheel. Sidekiq recommends for a bare Rack app, a session middleware before Sidekiq::Web in config/routes.rb should be used (reference [https://github.com/mperham/sidekiq/blob/main/Changes.…
    on Ruby on Rails Sidekiq - Comments

  4. Use Concerns in Rails

    When it comes that you need to reuse some functions across different models in Rails, Concern [http://api.rubyonrails.org/classes/ActiveSupport/Concern.html] comes to rescue. In our example, we have a few stats models which all have result_on field, which needs to be calculated from passed params…
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  5. A Quick Tip for Delayed Job in Rails

    I've been pondering on this delayed job in the Rails app. User specify a time that they'd like the job to run. Passing that into the delayed job is straight forward. CustomerEmail.delayed_job(queue: 'mail', run_at: params[:date]) But when I checked…
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  6. Arel and Nested Queries

    Arel is good at facilitating conditional clauses. This post mainly focuses on how to write nested queries with Arel. Let's look at a simple nested select example: SELECT * FROM ( SELECT * FROM users WHERE users.id < 100 ) as old_users One way to implement this is mixing ActiveRecord…
    on Ruby on Rails Arel SQL - Comments