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Rubymine FileType mismatch

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…

Exception notifier: How to provide custom data to fail mails

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…

Katapult 0.5.0 released

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

How to access before/after pseudo element styles with JavaScript

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.

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

Repeats

Devise: Don't forget to lock users with soft delete

There are two ways to lock a user in devise.

  1. Using the lockable module
  2. Customizing the user account status validation when logging in.

It depends on your requirements which methods works best.

Locking a user on soft delete

We recommend to use option 2 when you want to couple the lock to the m…

Repeats

Let the browser choose the protocol

Use protocol independent URLs whenever possible so that the browser will choose the protocol related to the protocol which the page is delivered with.

Example issues

  • When your page is delivered via https and you provide a youtube video only via http the most browsers (e.g. Firefox, Chrome) won't display the video.
  • When you deliver your youtube video via https://youtu.be/jyElDp98HdI your test which checks that the embeded video is rendered in the view will fail because your test server doesn't use https

Solution

Let your lin…

Auto-destruct in 55 days

Updated: Protected and Private Methods in Ruby

Elaborated on protected methods:

Protected methods can be called implicitly or explicitly, as long as the receiver "is_a? self.class". An object may call a protected method on another instance of the same class, as well as on an instance of a subclass. Invoking a protected method from a class method, even of the same class, is not possible. There are no protected class methods.

How to find a Google API project by project number

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 …

Repeats

Don't forget: Automatically remove join records on has_many :through associations

Bad

# Given the following models

class Image < ActiveRecord::Base
  has_many :album_image
  has_many :albums, through: :album_images
end

class Album < ActiveRecord::Base
  has_many :album_image
  has_many :images, through: :album_images
end

# Join model
class AlbumImage < ActiveRecord::Base
  belongs_to :album
  belongs_to :image
end

Destroying a record in this setup will only remove the record itself, and leave orphaned join records behind.

```
image = Image.last
image.destroy # removes only the image record,

jQuery: How to remove classes from elements using a regular expression

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 ...

Fixing "identify: not authorized"

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
  2. Remove/Comment lines after <!-- disable ghostscript format types -->

If you need it enabled for an app server, ask your operations team to do that for you.

Repeats

Building web applications: Beyond the happy path

When building a web application, one is tempted to claim it "done" too early. Make sure you check this list.

Different screen sizes and browsers

Desktops, tablets and mobile devices have all different screen resolutions. Does your design work on each of them?

  • Choose which browsers to support. Make sure the page looks OK, is usable and working in these browsers.
  • Use @media queries to build a responsive design
    • If you do not suppo…

How to: expand an element's cover area beyond its container

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:

```html

<div class="sec...
Auto-destruct in 51 days

Updated: Cucumber: Calling multiple steps from a step definition

  • Added warning that steps will ignore lines not starting with Given/Then/When/And/But.
  • Added contrast example using the step method
Repeats

Protected and Private Methods in Ruby

In Ruby, the meaning of protected and private is different from other languages like Java. (They don't hide methods from inheriting classes.)

private

Private methods can only be called with implicit receiver. As soon as you specify a receiver, let it only be self, your call will be rejected.

class A
 
  def implicit
    private_method
  end
  
  def explicit
    self.private_method
  end
  
  private
  
  def private_method
    "Private called"
  end
  
end ...
Repeats

RSpec 3 allows chaining multiple expectations

When you are using lambdas in RSpec to assert certain changes of a call, you know this syntax:

expect { playlist.destroy }.to change { Playlist.count }.by(-1)

While you can define multiple assertions through multiple specs, you may not want to do so, e.g. for performance or for the sake of mental overhead.

RSpec allows chaining expectations simply by using and.

expect { playlist.destroy }
  .to change { Playlist.count }.by(-1)
  .and change { Video.count }.by(0)

The above example will call playlist.destroy only…

Repeats

Understanding database cleaning strategies in tests

TLDR: In tests you need to clean out the database before each example. Use :transaction where possible. Use :deletion for Selenium features or when you have a lot of MyISAM tables.

Understanding database cleaning

You want to clean out your test database after each test, so the next test can start from a blank database. To do so you have three options:

  • Wrap each test in a transaction which is rolled back when you're done (through DatabaseCleaner.strategy = :transaction or `config.use_transactional_fi…
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