Given those modules: module A def foo; end def bar; end end module B end When you want to call...
...MySQL and you know the "error" is okay (e.g. you've executed the same statement at the same time on 2 masters which sync each other), you can skip this...
...error and continue with the replication without having to set up the slave from the ground up. stop slave; set global sql_slave_skip_counter = 1; start slave;
You can use JavaScript to get or set cookie values on the client. Using the vanilla JavaScript API In JavaScript, document.cookie is an accessor to all cookies on the current...
...site. It looks like a String, but its setter is actually more powerful. When setting cookies this way, remember to set the path=/ option. Reading cookies A result may look...
...written in pure Ruby and integrates with Rails applications. It provides features as automatic sizing of dots and lines (the more values, the thinner the graph's elements), custom or...
...predefined themes, different styles (bar, line, dot and many more) and multiple graphs in one chart. Installation In your Gemfile: gem 'rmagick', :require => false gem 'gruff' Then run bundle install...
...entering only http://example.com/). If you want to make a request to that site's web server without actually talking to www.example.com (e.g. because this is a load balancer...
...s address but you want to access one specific machine), you cannot just request machine1.example.com or localhost as the above vhost will redirect your request. When talking HTTP 1.1, your...
...Ever wanted to give an element "the container's width minus 20px on each side"? Here you go: .foo { width: calc(100% - (20px * 2)); } When using Sass, you need to...
...interpolate Sass expressions: $margin: 20px * 2 .foo width: calc(100% - #{$margin}) Supported by all modern browsers and IE9...
...message like this, rubygems.org might have issues with their ipv6 connectivity: $ bundle install Fetching source index from https://rubygems.org/ Retrying fetcher due to error (2/4): Bundler::HTTPError Could not fetch...
...specs from https://rubygems.org/ due to underlying error <timed out (https://rubygems.org/specs.4.8.gz)> The (a little bit dirty) possible solution If that's actually the case, then you can try...
How to ignore new files Globally Add the path(s) to your file(s) which you would like to ignore...
can’t find executable rails for rails-3.2.3 (Gem::Exception) ... one of several...
...things might be wrong. You're using RVM It's possible that you have a system-wide gem executable (like rails) that requires a gem that is not available in...
...to those fields that is case-insensitive. The model looked like this: create_table :shop_locations do |t| t.string :street t.string :house_number t.string :zip_code t.string :city t.belongs_to...
end But how to solve the uniqueness problem? Another day, another undocumented Rails feature! This time, it’s that ActiveRecord::Base.connection.add_index supports an undocumented option to pass a...
...Use Before and After to avoid that. Details Consider this Cucumber feature file: Feature: Something that needs to be tested Background: Given a user And I sign in Scenario: Sign...
When I sign out Then I should see "Signed out" Scenario: Something else # ... Now, assume you have these step definitions: Around do puts "** Around: before yield" yield puts "** Around...
On your local system that only hosts non-critical development data and only you have access to, you can store MySQL's root password in your home directory so you...
...out of the question if there's any confidential data in your databases. Assuming diligent screen-locking, an encrypted hard disk and correct permissions set on your credential file, it...
jQuery offers many different methods to move a selection through the DOM tree. These are the most important: $element.find(selector) Get the descendants of each element in the current set...
...of matched elements, filtered by a selector. Does not find the current element, even it matches. If you wanted to do that, you need to write $element.find(selector).addBack(selector...
A comprehensive introduction to sending HTML emails. Intro: HTML email: Two words that, when combined, brings tears to a developer’s eyes. If you’re a web developer, it’s...
...in your career, whether you like it or not. Coding HTML email is old school. Think back to 1999, when we called ourselves “webmasters” and used Frontpage, WYSIWYG editors and...
Spreewald's patiently repeats the given block again and again until it either passes or times out. Be careful to give patiently a block that can actually be repeated. E.g...
...the field variable that was defined outside of the block (it's the variable set from the Given block's arguments). Because of this, during the first repetition the value...
...run rake and your code is causing an exception which is not the one shown in your terminal. Rails tries to catch this exception and clean up constants but -- while...
...it's still booting up -- fails on this which causes another exception: rake aborted! cannot remove Object::ClassMethods Running rake with the --trace parameter will give you no love; the...
...Basic.encode_credentials for that, and put its result into the Authorization request header. Request specs For request specs, use the :header option. it 'requires authentication' do get '/' expect(response.status).to...
...username, password) get '/', header: { Authorization: encoded_credentials } expect(response.status).to eq(200) end Controller specs In controller specs, you can put then into request.env['Authorization']. it 'requires authentication' do
...an array, neither JavaScript/ES6+ nor libraries like LoDash offet that natively. Here is a simple function instead that modifies the input array in place. function moveArrayElement(array, element, offset) {
...It was what I needed, but you could easily adjust that. Check the linked StackOverflow post for more information and other implementations...
The Interactive Advertising Bureau (IAB) is a European marketing association which has introduced a standard how advertising can be served to users in line with the General Data Protection Regulation...
...GDPR). This standard is called the TCF 2.0 (Transparency and Consent Framework). If you want to integrate any kind of advertising into a website, chances are the advertising network will...
Capistrano automatically logs each (successful) deployment into a file on your application servers. It is located at the root of your server's project folder, i.e. the parent of releases...
...and current, like so: /var/www/your-project$ ls current log releases repo revisions.log <--- here shared Each line in that file contains the deployed branch, commit, release ID, and username (was read from...
Having a unique selector for an element is useful to later select it from JavaScript or to update a fragment with an Unpoly. Haml lets you use square brackets ([]) to...
...with ActiveRecord instances, which have a persisted #id and will hence generate the same selector over multiple renderings of the same view. Example - @users.each do |user| .row[user] = user.name
...the transcluded content before adding it to the DOM. # Directive template: """ """ transclude: true link: (scope, element, attributes, _controller, transclude) -> transclude (content) -> # Do custom stuff element.find('.wrapper').append(content)
...much more you can do with the transclusion function. For an in-depth introduction, see this Guide to Angular Transclusion. Also read the Angular docs on this...
Suppose you want to implement a publish/subscribe pattern in your Frontend application to react to data changes and events. First, you might be looking for an event emitter library.
...why it’s important to find a way to order and maintain your routes. See: Clean your Rails routes: grouping Sometimes the routes.rb grows very fast and each line adds...
...confusion to it. Maybe it is time for a new approach. The quoted article suggests to split up your routes.rb into small partials to keep it clean. For example you...