Dmitry Daw articles - 14 total
A way to cache responses in Grape API
Caching is a great way to speed up slow pages and to make your API faster in general. Let's say we...
How to fix a segfault in Ruby
Let's say you got a "Segmentation fault" error in Ruby [BUG] Segmentation fault at...
How to use rbtrace from outside of docker container
Rbtrace is a great tool to see which functions your app is calling at the time. In most cases you...
Base test profiling inside docker with test-prof
Install test-prof and stackprof gems. group :test do gem "test-prof", "~> 1.0" gem...
Is ActiveRecord right in omitting parentheses in queries? (and how ChatGPT lies again)
I need to get a selection of users with an SQL query like this: sql =<<~SQL token IS...
Deploy Anycable with Kamal(formely MRSK)
Here we'll deploy Anycable wih Kamal(MRSK before). We need our Rails code for anycable-rpc, so...
How to port VS Code plugins to your favorite editor(e.g. Emacs), with the example of Github Copilot Labs.
TLDR: Proof of concept code is here https://github.com/haukot/copilot_labs_plugin_base VS...
Trick to cleaner use Sidekiq::Testing.inline! in tests
By default, Sidekiq jobs don't run in tests. But sometimes, e.g. in e2e tests, you'd want them to...
How to cache Kamal(MRSK) deployments in CI
Caching is a key strategy in optimizing Docker deployments. But because CI don't saves previous...
What to do if Sidekiq job is stuck
If your Sidekiq job is stuck, your first intention may be to try to stop this job. But Sidekiq...
Troubleshooting weird DB connection errors in Rails with PostgreSQL
There are a number of errors that occur when attempting to use a database connection that has...
How to query Ancestry fast
Ancestry is a great library to organize models in a tree structure. For example, if you have Locatio...
Test Rails API with json type
By default Rails converts all params that come from Rspec to strings(related issue https://github.com...
Swagger/OpenAPI and Rails array param
Ruby On Rails automatically parses query params as array if they are given in format expand[]. Like...