ActiveSupport::Notifications provides an instrumentation API for Ruby. It is used throughout rails to publish instrumentation events that include information...
You know those helper methods that just render some HTML but look weird because of content_tags all over the...
We have a new gem Minidusen which extracts Dusen's query parsing and LIKE query functionality. Minidusen can no longer...
If you were using Dusen for its query parsing and LIKE queries, we recommend to migrate to Minidusen, which extracts...
You want Spring for super-fast binstubs like bin/rails or bin/rspec which avoid Rails boot time. You want parallel_tests...
Promises are the new way™ to express "Do this, and once you're done, do that". In contrast to callbacks...
Sometimes you want to test migrations with production or staging data. Dumping single tables makes sense if a complete dump...
To check the currently running PG version from your Rails application (e.g. Rails console on your production server), simply do...
PostgreSQL, unlike MySQL, treats strings as case sensitive in all circumstances. This includes comparison with = and LIKE collision detection in...
When building a web application, one is tempted to claim it "done" too early. Make sure you check this list...
You can define methods using def or define_method. In the real world, there is no performance difference.
Apparently you can pash a second scope to a hash-condition and the whole thing will be evaluated as a...
This is quite an edge case, and appears like a bug in Rails (4.2.6) to me. Update: This is now...
You can download .gem files using gem fetch: gem fetch activesupport consul This will produce files like active-support-5.0.0.gem and consul-0.12.1.gem...
Processes in Linux might be put into Swap ("virtual memory") occasionally. Even parts of a single process might be removed...
The way that Javascript schedules timeouts and promise callbacks is more complicated than you think. This can be the reason...
Have you ever mistaken one Rails environment for another? The attached helper will help you to never do it again...
to create a Gallery that has a name and has_many :images, which in turn have a...
ActiveRecord offers an explain method similar to using EXPLAIN SQL statements on the database. However, this approach will explain all...
Helix allows you to implement performance-critical code of your Ruby app in Rust, without requiring glue code to bridge...
This gem gives you a rake task db:seed:dump do create a db/seeds.rb from your current database state.
OAuth requires a set of params to be carried along requests, among which a nonce. Some libraries pass these along...
When creating an index using CREATE INDEX, Postgres will create a B-Tree type index by default. The B-Tree...
jQuery's deferred objects behave somewhat like standard promises, but not really. One of many subtle differences is that there...