Enable local logging for Sentry when:

• Debugging Sentry event capture locally
• Testing error handling without polluting production metrics
• Developing background jobs and want to see what Sentry captures

How to enable

To capture and log Sentry events locally during development without sending to the server, add this to config/initializers/sentry.rb inside the Sentry.init block:

if Rails.env.development?
  # Use dummy transport to prevent actual transmission to Sentry
  config.transport.transport_class = Sentry::DummyTran...

Full-text search can reach its limits in terms of flexibility and performance. In such cases, trigram indexes (pg_trgm) offer a lightweight alternative.

You can base the index on a virtual column that combines multiple text attributes. A stored virtual column stores the result of an expression as if it were a real column. It is automatically updated when the source columns change and can be indexed like normal data. This keeps your query logic consistent and avoids repeating string concatenation in every search.

def searc...

Good reference how to build bootstrap forms with simple_form.

Summary

• Use return to return from a method. return accepts a value that will be the return value of the method call.
• Use break to quit from a block and from the method that yielded to the block. break accepts a value that supplies the result of the expression it is “breaking” out of.
• Use next to skip the rest of the current iteration. next accepts an argument that will be the result of that block iteration.

The following method will serve as an example in the details below:

def example
  puts yield
  puts ...

Database connections are not thread-safe. That's why ActiveRecord uses a separate database connection for each thread.

For instance, the following code uses 3 database connections:

3.times do
  Thread.new do
    User.first # first database access makes a new connection
  end
end

These three connections will remain connected to the database server after the threads terminate. This only affects threads that use ActiveRecord.

You can rely on Rails' various clean-up mechanisms to release connections, as outlined below. This may...

When starting a project we always make a good estimate of all known requirements, and plan budgets and available developers accordingly.

Requirements change. Budgets usually don't.

To make sure a project stays on track, we update our estimates periodically and compare them to the remaining budget. If this doesn't match any more, we have to act.

To update an estimate, do the following:

• Start with the most recent estimate for the project.
• Which stories have been completed? Set their estimate to zero.
• Have any requirements cha...

To allow HTTP 304 responses, Rails offers the fresh_when method for controllers.

The most common way is to pass an ActiveRecord instance or scope, and fresh_when will set fitting E-Tag and Last-Modified headers for you. For scopes, an extra query is sent to the database.

fresh_when @users

If you do not want that magic to happen, e.g. because your scope is expens...

If you try to listen to events on elements that are nested inside a <fieldset disabled>, Firefox will stop event propagation once the event reaches the fieldset. Chrome and IE/Edge will propagate events.

Since we often bind event listeners to document this can be annoying.

You could solve it by...

• ...adding event listeners on elements themselves. Note that this is terrible when you have many elements that you'd register events for.
• ...adding event listeners on a container inside the <fieldset>, around your eleme...

Performing COUNT(*) on large tables is slow. Sometimes you don’t need the exact number once results exceed a certain threshold.

For example, you may only need to display 100+ in the UI. Using a plain COUNT(*) would scan all matching rows.

The following query would be pretty slow when counting many rows because it has to scan all rows.

SELECT COUNT(*) FROM movies;

Limiting within a subquery

Use a subquery with LIMIT to cap the scan early. ...

When RSpec sets out to print any given object to the console, it will never print more than 200 characters from it. Only the first and last 100 chars from overly long strings are displayed, which sometimes means that the root cause for the failing test is buried in truncation.

For example, I could not easily make out the reason for this failure:

Failure/Error: expect { crawler.pull_new_commits }.not_to raise_error

expected no Exception...

On Ruby 1.9+, standard ruby character classes like \w, \d will only match 7-Bit ASCII characters:

"foo" =~ /\w+/   # matches "foo"
"füü" =~ /\w+/   # matches "f", ü is not 7-Bit ASCII

There is a collection of character classes that will match unicode characters. From the documentation:

• /[[:alnum:]]/ Alphabetic and numeric character
• /[[:alpha:]]/ Alphabetic character
• /[[:blank:]]/ Space or tab
• /[[:cntrl:]]/ Control character
• /[[:digit:]]/ Digit
• /[[:graph:]]/ Non-blank character (excludes spaces...

Is your application doing something expensive every few seconds? Maybe an animated slider that rotates images? Maybe you are updating data over the network every five minutes? It's a good idea to pause this if the your document tab is not even visible to the user. This saves your user's battery and data plan.

You can ask document.visibilityState or document.hidden whether this tab is visibl...

The linked tool can be used to scan your CI/CD workflows for potential security issues and suboptimal defaults if they are based on GitHub Actions.

For example, it warns you about

• string interpolations that may expand into attacker-controllable code
• suboptimal defaults like e.g. persist-credentials: true for the checkout action
• actions that are not pinned to a tag instead of a git SHA

Some of the warnings can be auto-fixed. The tool comes wi...

In Rails 8 the behavior of the rails db:migrate command has changed for fresh databases (see PR #52830).

• Before Rails 8: The command runs all migrations in the folder db/migrate/*
• After Rails 8: The command loads the schema file (db/schema.rb or db/structure.sql) if existing and runs all pending migrations in the folder db/migrate/* afterwards

This speeds up the command. But e.g. migrations with data manipulations are missing.

The only way to run all pending mig...

vertical-align is hard. Have you ever wanted to vertically center an icon with text? This usually means "vertically align with capital letters", as visually, a text line goes from baseline up to the capital top. (That's because descenders are far less frequent than ascenders.)

In this card we'll vertically center an icon (or any "blockish" inline element, really) with the capital letters of surrounding text. This works well with our [modern approach to SVG icons](/mak...

With the the Ruby Tempfile class you can create temporary files. Those files only stick around as long as you have a reference to those. If no more variable points to them, the GC may finalize the object at some point and the file will be removed from the file system. In other words: tempfiles are removed automatically. If you would then try to access the tempfile using its path (which you stored previously), you would get an error because the file no longer exists.

You can proactively unlink your tempfiles to delete them earlier...

When requests arrive at the application servers simultaneously, weird things can happen. Sometimes, this can also happen if a user double-clicks on a button, for example.

This often leads to problems, as two object instances are modified in parallel maybe by different code and one of the requests writes the results to the database.

In case you want to make sure that only one of the requests "wins", i.e. one of the requests is fully executed and completed while the other one at least has to wait for the first request to be completed, you ha...

This release adds asynchronous compilers and many other features requested by the community.
We also fixed a number of performance regressions introduced by Unpoly 3.11.

Breaking changes are marked with a ⚠️ emoji and polyfilled by unpoly-migrate.js.

Asynchronous compilers

Compiler functions can now be [async](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/...

Website that offers lots of different kinds of HTTPS configurations, bad or good or complicated.

They also offer a dashboard to check if your browser's HTTPS handling works as expected (which might be compromised e.g. due to security products or enterprise proxy servers).

With ActiveType 1.2 you can modify associations (has_many etc.) after they have been defined.

One common use case for this is to change an association inside a form model, like this:

class Credential < ActiveRecord::Base
end

class User < ActiveRecord::Base
  has_many :credentials
end

class SignUpCredential < ActiveType::Record[Credential]
end

class SignUp < ActiveType::Record[User]
  change_association :credentials, class_name: 'SignUpCredential'
end

Now, if you load `credentials...

Note

Compiling Sass is probably the slowest part of your build, so this is worth a try if you're using Sass.

If you're using the sass npm package to compile your SASS/SCSS, consider switching to sass-embedded. It should be a drop-in replacement in a large app and it's around 50% faster than using the deprecated sass package.

Changelog

• geordi dump: Allow to forward the compression option to the underlying dumple command, e.g. geordi dump --compress=zstd:3 (for PostgreSQL) or geordi dump --compress (for MySQL).
• dumple: Allow to specify a compression algorithm for PostgreSQL, e.g. dumple --compress=zstd:3. The already supported compression for MySQL dumple --compress is kept untouched.

In PostgreSQL you will notice a speedup of ~50%.

Example

Performance improvements during a deploy (e.g. lib/capistrano/tasks/db.rake)

namespace...

I had to modify the time for an application that I launch through Docker.
Here is an approach that worked for me without modifying or wrapping the container image.

Note

This is quite hacky and may not work for everyone. The "proper" way is probably to have a custom Dockerfile to wrap an existing image, or adjust a custom image's Dockerfile. I wanted to do neither.

So, I had an application that I ran through a pre-built image. Basically this:

docker run --rm -it example/image

The [faketime](https://manpages.ubuntu.c...

GoodJob and ActiveJob rescue exceptions internally, preventing exception_notification from triggering. This can cause silent job failures.To get notified, subscribe to ActiveJob events and configure GoodJob's on_thread_error hook. This lets you manually call your exception notifier for every retry, discard, or internal GoodJob error.

# config/initializers/good_job.rb

# Manually notify on job failures, as they are handled internally by ActiveJob/GoodJob.
ActiveSupport::Noti...