Puma allows you to specify the max and min threads. In development this could be useful if you use a debugger, but do not want to overflow the console with other request like from ActionCable. Then just set the max threads to 1 and the other requests have to wait.

WORKER_TIMEOUT=1000 puma -t 0:1 -w 1 -p 3000

Cucumber has an output format that prints step definitions only. You can use this to find unused ones:

1. Temporarily add require_relative 'env' to the top of the first file in features/support. --dry-run makes Cucumber skip loading env.rb.
2. Open a really wide terminal window.
3. bundle exec cucumber --dry-run --format stepdefs | grep -B1 'NOT MATCHED' --no-group-separator | grep features/step_definitions

This will print all unused step definitions from your project – however, the result will include false positives. Step...

TL;DR In blueprints, always wrap associations in blocks.

# Broken
Task.blueprint(:vacation) do
  project Project.make(:vacation)
  hours 8
  accounting_method 'none'
end

# Correct
Task.blueprint(:vacation) do
  project { Project.make(:vacation) }
  hours 8
  accounting_method 'none'
end

Without the block, Project.make will only run once when the blueprint is parsed (usually when RSpec is loaded), which is not what you want.

When upgrading Rails versions -- especially major versions -- you will run into a lot of unique issues, depending on the exact version, and depending on your app.

However, it is still possible to give some generic advice on how you want to tackle the update in principle.

If you are not really confident about upgrading Rails, have a look at Rails LTS.

How many update steps?

Besides the Rails upgrade itself, you might also want to upgrade your other gems and upgrade your Ruby version.
First decide in how many st...

The Ace editor is a great enhancement when you want users to supply some kind of code (HTML, JavaScript, Ruby, etc).
It offers syntax highlighting and some neat features like auto-indenting.

For Webpack 3+

Integrate as described in the documentation. For example load ace Editor like this:

  function loadAceEditor() {
    return import(/* webpackChunkName: "ace" */ 'ace-builds/src-noconflict/ace').then(() => {
      return import(/* webpackChunkName: "ace" */ 'ace-builds/webpack-r...

So you are debugging like a boss and lost track of where you actually are in your code? No problem:

• Calling "l=" will show you the current file and line. That's a lower-case L and an equals sign.
• "where" (or "backtrace") will give you the debugger call stack, including current file and line as well. It can be quite long.

There are many ways to optimize SVGs. Ideally, your build pipeline does that automatically for you (e.g. via postcss-svgo).

If you want to manually tweak an SVG, you can use SVGOMG which is an application running SVGO in your browser.
You should deactivate the option "Remove viewBox" because you want SVGs to be scalable by the browser.

You see a live preview of any changes you make, and can copy the SVGO source with a single click (or download the optimized SVG).

We figured out, that ActiveJob Inline might lead to autoloading problems in development. The result was an exception when running an import script, which delivers async mails.

A copy of XXX has been removed from the module tree but is still active! (ArgumentError)

Our fix was to use .deliver_now and not .deliver_later (this is not a general fix, but it was okey for us). Below there are some debug hints which helped us to locate the problem:

• We placed a pry debugger in [ActiveSupport#clear](https://github.com/rails/rails/blob...

If your Rubymine does not recognize a file type correctly although you have entered the unmistakeable file extension like material_orders_controller.rb, this may help you:

Causing the Problem

Sometimes you create a new file and forget to enter the ending like material_orders_controller
Rubymine handles such files per default as simple txt files.
You delete this file and create a new one with correct ending: material_orders_controller.rb. But still Rubymine treats this file as text file, no highlighting is available.

What happene...

The exception_notification gem supports to provide custom data to e.g. the fail mail within foreground or background jobs.

ExceptionNotifier.notify_exception(_ex_, :data => {:message => "was doing something wrong"})

Still this can be blocked if you have an initializer where you override the default sections and background_sections option. So remember to add the data option to the desired section if required. In case you raise an exception without a data object, the fail...

Occasionally, your designer will hand you designs where elements break the layout's horizontal container width, like navigation buttons of a slider that should be at the left/right of the browser window, or simply by applying a background color that reaches until the left and right of the browser window.

In the past, we've done some horrible things to achieve that. Like margin: 0 -10000px plus overflow-x: hidden.
There is a much saner approach.

Consider the following markup:

<body>
  <div class="container">
    <div class="sec...

New Features

• Deployment ready for Opscomplete
• Copying view and controller templates over to target application during
  basics configuration or via new command katapult templates.
• "Usage" section in README rewritten: Now describes two usage scenarios.

Improvements

• Generating a fixed Gemfile.lock. Run bundle update after code generation to
  update all gems to recent versions.
• Better deployment with Webpack
• Navigation only rendered if requested
• Some minor fixes

When you created a project on the Google API Console which is not being used, you may receive an e-mail like the following one.

This is to inform you that we noticed your project(s) has not accessed or used the YouTube Data API Service in the past 60 days.

For reference, your inactive project number is ...

While projects do have names, the e-mail will only tell you its (generated) number. But if you use the API Console's search, you won't get any results for project numbers. Also, project numbers are not visible when you click and ...

Accessing pseudo elements via JavaScript or jQuery is often painful/impossible. However, accessing their styles is fairly simple.

Using getComputedStyle

First, find the element in question.

let element = document.querySelector('.my-element') // or $('.my-element').get(0) when using jQuery

Next, use JavaScript's getComputedStyle. It takes an optional 2nd argument to filter for pseudo elements.

let style = window.getComputedStyle(element, '::before')
let color = style.getPropertyValue('background-color...

jQuery's removeClass removes the given class string from an element collection. If you want to remove multiple/unknown classes matching a given pattern, you can do that.

For example, consider a DOM node for the following HTML. We'll reference it by $element below.

<div class="example is-amazing is-wonderful"></div>

Option A: Selecting classes, then removing them

You can iterate over existing classes, and select matching ones. The example below is ES6, on ES5 could write something similar using jQuery.grep.

let classes ...

Ubuntu has decided to disable PDF processing because ImageMagick and the underlying Ghostscript had several security issues.

When your Ghostscript is up to date (and receiving updates regularly), you can safely reactivate PDF processing on your computer like this:

1. Open /etc/ImageMagick-6/policy.xml (requires sudo)
   • For older versions of Ubuntu (or possibly ImageMagick), the path is /etc/ImageMagick/policy.xml
2. Remove/Comment lines after <!-- disable ghostscript format types -->

If you need ...

Note: This applies specifically to MySQL. In PostgreSQL for example, this is not an issue.

If you care about performance, never use a query like

UPDATE users SET has_message = 1 WHERE users.id IN (SELECT user_id FROM messages)

MySQL does not optimize this and seems to scan the temporary table, which isn't indexed, for every row in the update statement. This applies to other statements than UPDATE as well.

Instead, either use a JOIN like

UPDATE users INNER JOIN messages ON messages.user_id = users.id SET has_message =...

A nice bookmarklet to analyze how many watchers have been registered on the current page. Good for keeping an eye on watchers count while developing.

• Use as a bookmarklet.
• Works with Angular 1.x
• Logs to the browser's console.

Grazie Lite

Rubymine 2024.3 bundles Grazie Lite by default. You need to enabled "German" under Settings/Preferences | Editor | Natural Languages.

Hunspell (legacy)

1. Install the Hunspell plugin and restart Ruby Mine
2. Run sudo apt install hunspell-de-de
3. Select /usr/share/hunspell/de_DE.dic in File > Settings > Editor > Spelling > Custom Directory +

![Screenshot_from_2018-10-17_16-47-03.png](https://makandracards.com/makandra/57341-rubymine...

Geordi uses parallel_tests if available for running the test suite. To debug an application it is very unhandy to have multiple processes as your terminal I/O will not work as expected once a breakpoint is hit.

Even parallel_tests support an option to enable a single process run, it is not possible to pass this option through geordi. But you can set the number of processes via ENV variable manually:

PARALLEL_TEST_PROCESSORS=1 bundle exec geordi cucu...

It is possible to access Rails config (for example secrets) from within your webpack bundles, thanks to rails-erb-loader. When using webpacker, the setup is like this:

1. Install rails-erb-loader:

   yarn add rails-erb-loader
   

2. Add this to your config/webpacker/environment.js:

   environment.loaders.prepend('erb', {
     test: /\.erb$/,
     enforce: 'pre',
     use: [{
       loader: 'rails-erb-loader',
     }]
   })
   

3. Start using erb. For examp...

In addition to the {{ myValue }} two-way binding syntax, since Angular 1.3 there's a one-time binding syntax, prefixing the value or expression with ::, e.g. {{ ::myValue }}, {{ ::myValue >= 42 }} and {{ ::myExpression(value) | someFilter }}.

One-time bound expressions get dropped from the list of watchers as soon as they can be resolved. Performance-wise the impact for this small change is huge, since Angular apparently slowes down with too many watchers registered [(Source)](http://www.binpress.com/tutorial/speeding-up-angular-js-wi...

You can tell git to ignore different kinds and amounts of whitespace when merging or cherry-picking. This often occurs when you changed indentation, or converted tabs to spaces.

Simply use

git merge <REV> -Xignore-space-change

or

git cherry-pick <REV> -Xignore-space-change