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...
When you're facing a somewhat complex Google Analytics setup and want to find out what's happening, you can use this Chrome extension. It's much simpler than other...
...like "Google Tag Assistant") and does just one job and does it well. To see what's happening, you need to open your developer console...
The team is responsible for building great software—that’s it. It’s the only thing the team is responsible for and it’s the only thing that they actually...
...control. In other words, the development team is committed to quality software...
...unknown, technique in Ruby. For certain types of problems (e.g. when you have a set of rules) this gives you such an elegant way of describing the solution. There’s...
...no meta programming or monkey patching involved, it’s short and sweet and best of all: it’s very intuitive...
Trample is a more flexible load simulator. Instead of a static list of urls, trample's configuration language is ruby. Using ruby's blocks (lambda functions), it's possible to...
The goal of modelling is to produce something substantially simpler than the world. This is achieved not through endlessly inventing new types and relationships -- in fact, it's just the...
...s by eliminating entities and restricting types that we get a model that's simpler than the world and thus useful...
...as expected with your Unpoly app. This is because your app only has a single page load when the user begins her session. After that only fragments are updated and...
...up.compiler('[track-for-analytics]', function($element) { var url = $element.attr('track-for-analytics') || location.pathname; ga('set', 'page', url); ga('send', 'pageview'); }); Finally look for containers that represent trackable content, and give...
...an attacker might be able to use this to inject javascript code into the source code of your page. The linked github page is a collection of common markdown XSS...
...which is handy for writing tests. Producing arbitrary links: [Basic](javascript:alert('Basic')) [Local Storage](javascript:alert(JSON.stringify(localStorage))) [CaseInsensitive](JaVaScRiPt:alert('CaseInsensitive')) [URL](javascript://www.google.com%0Aalert('URL'))
...call model.save! after recreating versions. uploader.recreate_versions! does not update the model with the stored filename...
...was typical approach for object oriented languages, designed in the 90s. A thread is sequence of instructions that can be scheduled and executed in the context of a process. Several...
...at the same time. Ruby’s VM process allocates a memory heap, which is shared and writable by threads. If incorrectly coordinated, those threads can lead to unexpected behaviors...
require 'logger' log = Logger.new('log/mylog.log') log.info 'Some information' log.debug 'Debugging hints' log.error StandardError.new('Something went wrong') Logger does a number of things well: Message type (info / debug / error...
Log entries are timestamped Writing log output is synchronized between threads Logged errors are printed with full backtraces If you don't like the output format, you can...
PostgreSQL and ActiveRecord have a good support for storing dynamic attributes (hashes) in columns of type JSONB. But sometimes you are missing some kind of validation or lookup possibility (with...
...plain attributes you can use Active Record's built-in validations and have your schema.rb). One approach about being more strict with dynamic attributes is to use JSON Schema validations...
2.ordinalize # => "2nd" 1002.ordinalize # => "1002nd" 1003.ordinalize # => "1003rd" -11.ordinalize # => "-11th" -1001.ordinalize # => "-1001st...
An unresponsive service can be worse than a down one. It can tie up your entire system if not handled properly. All network requests should have a timeout.
...You should avoid Ruby’s Timeout module. The default is no timeout, unless otherwise specified. Enjoy...
I use the TypeScript compiler for this, since its output is more minimal than Babel's. The following will transpile all src/*.js files into a file build.js:
npx tsc src/*.js --target ES5 --allowJs --outFile build.js The output will only transpile ES6 syntax. It will not include any polyfills for missing APIs...
When CoffeeScript was added to Rails 3.1 they forgot one very important part, the ability to use it when responding...
...dependeny of capybara gem 'nokogiri', '< 1.6' # dependency of capybara gem 'rubyzip', '< 1' # dependency of selenium-webdriver, rubyzip 1+ requires Ruby 1.9 gem 'cucumber_factory' gem 'database_cleaner', '< 1'
...spinner', '~> 0.2.5' gem 'launchy', '~> 2.1.2' With these versions set, selenium-webdriver will be at version 2.35.1. This is because all later versions depend on rubyzip 1+. More info. After upgrading...
...image formats like JPG or PNG, each pixel is basically drawn on a fixed size canvas. To display such an image in a different size (say: 1.5 times larger than...
...Monitor) needs to interpolate the color values of missing pixels. The image will appear slightly blurred. This is different for vector graphics like the SVG (Scalable Vector Graphics) format. You...
Sometimes you accidentally generate entries in the bash history that you do not want to have there (e.g. commands with credentials). Here's how to remove single entries.
...look at the bash history with the history command. To see e.g. the last 5 entries, use history | tail -n 5: >history | tail -n 5 1994 my-secret-command...
Select2 comes with AJAX support built in, using jQuery's AJAX methods. ... For remote data sources only, Select2 does not create a new element until the item has been selected...
query: params.term, page: params.page || 1 } } processResults: function (data, params) { return data }, } }); Further reading: https://select2.org/data-sources/ajax
...file, that don't use Ruby's logger utility, it is often useful to sync them. So other process can read the output just in time. Example with enabled sync...
File.read(log_path) #=> "Some log message\nSome other message\n" Example with disabled sync (default) log_path = '/tmp/some_log.log' log_file = File.open(log_path, 'a+') log_file.puts('Some log message')
...aws-credential-file ./aws-credential.txt The output should look something like this: arn:aws:iam::322191361670:server-certificate/www.example.com arn:aws:iam::322191361670:server-certificate/testCert Now you have to upload...
...and includes the server certificate Amazon Resource Name (ARN) and GUID: arn:aws:iam::322191361670:server-certificate/www.example.com-2011 ASCACexampleKEZUQ4K If you got the error message similar to A client error...
Here is some JavaScript code that allows you to click the screen and get the clicked element's text contents (or value, in case of inputs). The approach is simple...
...element. When you click the overlay, we look up the element underneath it and show its text in a browser dialog. You can then copy it from there.
...To reconfigure later, call s3cmd --configure. Once you're done setting up, s3cmd gives you shell-like commands like s3cmd ls or s3cmd del somefile.png. Here is a full list...
s3cmd accesslog s3://BUCKET Sign arbitrary string using the secret key s3cmd sign STRING-TO-SIGN Sign an S3 URL to provide limited public access with expiry