I just finished migrating a project from the Asset Pipeline to Webpacker, this is what my diff to master looks like:

5.825 files changed, 44.805 insertions(+), 529.948 deletions(-)
warning: inexact rename detection was skipped due to too many files.
warning: you may want to set your diff.renameLimit variable to at least 5134 and retry the command.

There is no way me or my peer reviewer is able to parse 500k+ lines of code. Fortunately, git has ...

Version 3.0.3 of our gem Spreewald has been released.

Now you can write your step without an email header like this:

Then an email should have been sent with:
  """
  Hello

  Bye
  """

The line "Hello" was ignored before. This has been fixed now and the step will search for both lines in the body.

3.0.3

• The an email should have been sent with step now interprets all lines as body when not specifying headers (see issue #157)

We forked trusty memoizer to make two changes:

1. Memoized methods now preserve their arity. Previously all memoized methods had an arity of -1.
2. Memoized methods are now faster at runtime. This will only be noticable if you call a memoized methods many times in the same request.

We published our fork as a new gem named memoized.

memoized is API-compatible to memoizer, you just need to include Memoized instead of `M...

When you need to add a click event handler to 50+ elements, this might slow down the browser.

An alternative is to register an event at the root of the DOM tree (document). Then wait for events to bubble up and check whether the triggering element (event.target) matches the selector before you run your callback.

Examples

For the examples below let's assume we have many <a class="dialog-link" ...> elements on our page. Clicking them should open a modal dialog.

Native JavaScript

document.addEventListener('...

When building an application that sends e-mails to users, you want to avoid those e-mails from being classified as spam. Most obvious scoring issues will not be relevant to you because you are not a spammer.

However, your application must do one thing by itself: When sending HTML e-mails, you should include a plain-text body or tools like SpamAssassin will apply a significant score penalty. Here is how to do that automatically.

1. Add premailer-rails to your Gemfile and bundle.
2. Done! ...

In case Ruby does not detected the expected encoding of a file automatically you can specify the known encoding manually.

Example with File.open

file = File.open('some.bin', encoding: Encoding::ASCII_8BIT)
text = file.read
text.encoding => #<Encoding:ASCII-8BIT>

Example with File.read

text = File.read('some.bin', encoding: Encoding::ASCII_8BIT)
text.encoding => #<Encoding:ASCII-8BIT>

More details about the encoding of strings in Ruby can be found [here](https://makandracards.com/makandra/474671-guide-to-string-encodi...

In Ruby you can communicate between threads with sockets. This might be helpful in tests that validate parallel executions or custom finalization logic after the garbage collector. Here is an example how such an communication will look like:

require 'socket'
BUFFER_SIZE = 1024

# DGRAM has the advantage that it stops reading the pipe if the next messages starts. In case the message size is larger than the
# BUFFER_SIZE, you need to handle if you are reading another part of the current message or if you already reading the
# next messag...

The Truemail gem (not to be confused with truemail.io) allows validating email addresses, e.g. when users enter them into a sign-up form. It runs inside your application and does not depend on an external SaaS service.

Truemail supports different validation "layers":

1. Regex validation: if the given address is syntactically valid
2. DNS validation (called MX validation): if the given domain exists and can receive email
3. SMTP validation: connects to the host received from DNS and starts a test d...

The ExceptionNotification has plugins that talk to external APIs rather then just sends emails, like microsoft teams or slack. You might encounter that no exceptions are delivered, which can be dangerous.

To prevent getting into trouble, simply add require 'resolv-replace' on top of your to your initializers/exception_notification.rb file:

require 'resolv-replace'
require 'exception_notification/rails'

ExceptionNotification.configure do |config|
  ...
end

This calls the Ruby DNS resolver before configuring `ExceptionNot...

Ruby offers monkey patching methods in order to change the behavior of a library if there's no better way.

We can call the method we're overriding inside our monkey patch:

class Foo
  def bar(argument)
    'Hello' + argument
  end
end 

module FooExtensions
  def bar
    super(' in my') + ' World'
  end
end

class Foo
  prepend FooExtensions # the only change to above: prepend instead of include
end

Foo.new.bar # => 'Hello in my...

When debugging your application, you will come across objects created by some gem or framework. You don't have the source code at hand, still need to inspect this object. Here are some tools to do so:

Relevant methods

@object.methods - Object.instance_methods returns a list of methods excluding methods inherited from Object. This makes the methods list drastically more relevant. You can also try subtracting other base classes like ActiveRecord::Base.methods etc.

Filtering method list

@object.methods.grep /keyword/ comes...

URLs can transport key/value pairs ("parameters") using this syntax:

/path?foo=bar

If the value is blank, mind these subtle differences:

In long diffs, it can become impossible to spot small changes in larger blocks of moved code. This may be either a method that was moved from the top to the bottom of a file, or a long test file that was split in many.

Fortunately, Git offers a special highlighting mode that directs the reader's attention to relevant code parts:

git diff --color-moved=dimmed-zebra

It will dim lines that were moved around without changes, and highlight changed lines. See this SO answer for an illustra...

To restart all tasks monitored by God, don't use god restart. This command is only meant to soft-restart a given process or group.

Instead you should:

god stop
god terminate
god start -c yourgodconfig.god