...dependencies and database types. Here's what Gemika can give your test's development setup (all features are opt-in): Test one codebase against multiple sets of gem dependency sets...
...currently MySQL or PostgreSQL). Compute a matrix of all possible dependency permutations (Ruby, gem set, database type). Manually exclude incompatible dependency permutations (e.g. Rails 5.0 does not work with Ruby...
The robots.txt file and HTML tag can be used to control the behavior of search engine crawlers. Both have different effects. robots.txt Marking a URL path as "disallowed" in robots.txt...
...crawlers to not access that path. robots.txt is not a guarantee for exclusion from search engine results. A "disallowed" URL might be known from an external link, and can still...
In Capistrano 2, directories in shared_children used to be symlinked to the shared directory during the finalize_update task. # /lib/capistrano/recipes/deploy.rb _cset :shared_children, %w(public/system log tmp/pids) # ... task :finalize...
...update, :except => { :no_release => true } do # ... shared_children.map do |d| run "ln -s #{shared_path}/#{d.split('/').last} #{latest_release}/#{d}" # <-- symlinks only the last segment here end # ... end This would symlink...
...could also use Haml instead. Example Consider the following helper. def greeting message = ''.html_safe message << 'Welcome to ' message << content_tag(:span, Rails.env, class: 'greeting--location') content_tag :div, message...
...That looks clumsy and is hard to read. Wouldn't it be nicer to say something like this? def greeting render_haml <<-HAML .greeting Welcome to %span.greeting--location = Rails.env
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...
When using Sidekiq in your application, you must write thread-safe code. This wiki page also lists gems that are known to be unsafe on threaded applications.
...gem that will also be used by a Sidekiq worker, make sure to confirm it's thread-safe...
...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...
...links. Popular pagination libraries like will_paginate or Kaminari do this for us by simply issuing an extra query, like this: SELECT post.* FROM posts LIMIT 20 OFFSET 100;
...of the time. But rarely, you might have very complicated WHERE conditions or a subquery that takes time to run. In these cases, doing two queries is slower than it...
...that whenever you are using those values for database interaction, you'll end up scoping on the wrong records since the database representation of these dates is not converted to...
Use form models to handle this problem Or soften the validation to validates_presence_of :parent Usually you would validate presence of parent object id, like in this...
validates_presence_of :parent_id # <- end With the parent already persisted creating nesteds still works fine. But one will encounter a 'parent id missing' error on creating a parent...
...You can add other AWS account depending files like .fog or .guignol.yml too. Create symlinks for some config files like .aws_credentials and .fog: ln -s ~/.aws/.aws_credentials ~/.aws_credentials
...export EC2_CERT=~/.aws/cert-ec2.pem export AWS_CREDENTIAL_FILE=~/.aws/aws-credentials Perhaps you also want to set a default region and the JAVA_HOME: export EC2_REGION=eu-west-1
Say you have an RGBA color that you need as a non-transparent color because of reasons. Basically, this is possible. Just understand that you will convert your RGBA color...
...your background is white, so you'll use #fff as that for examples below. Simple approach When your know the RGBA color's base RGB color (e.g. your brand color...
In specs, the session never persists but is always a new object for each request. Data put into the session in a previous request is lost. Here is how to...
...circumvent that. What's going on? You are making ActionController::TestRequests in your specs, and their #initialize method does this: self.session = TestSession.new This means that each time you say something...
Barby is a great Ruby gem to generate barcodes of all different sorts. It includes support for QR codes via rQRCode; if you need to render only QR codes, you...
>> Barby::Code128.new('Hello Universe').to_image.to_data_url => "data:image/png;base64,iVBORw0KGgoAA..." For super-crisp barcodes, render them as SVG. Printing images usually causes some level of blur...
...should), the host's IP address is: 10.0.2.2 You'll need it to access shared folders or your host's web server when testing pages in IE.
When you need to check a value for presence, don't rely on JavaScript since it considers 0 or "0" false. Also don't rely on LoDash's _.isEmpty:
While the name implies that it's meant only for collections, you probably still want something like isBlank or isPresent that return true/false for objects humans would normally consider...
...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...
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...
...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') The returned color will be a string...
...up little more than one extra line in the output of ps. On a server I want to get informed if there are zombie processes and track them with a...
...two choices, fix it or kill it. In this case it's no critical service and I can just restart it...
jQuery doesn't store information about event listeners and data values with the element itself. This information is instead stored in a global, internal jQuery cache object. Every time you...
...gets deleted is when you call remove() on the element that put it there! Since cache entries also have a pointer back to the element that spawned them, it is...
When using Savon to connect a SOAP API, you may want to use Savon::SpecHelper to mock requests in your tests as described in their documentation. When sending a message...
...body, the savon mock object requires a message to be set, like this: savon.expects(:action_name).with(message: { user_id: 123 }).returns(' ') If you want to stub only the returned...
Rails 5.2+ supports "verbose query logs" where it shows the source of a query in the application log. Normally, it looks like this: User Load (0.5ms) SELECT "users".* FROM...
...app/controllers/users_controller.rb:42:in `load_users' However, you may encounter ActiveRecord's LogSubscriber as the source for all/most queries which is not helpful at all: User Load (0.5ms) SELECT "users...
...require 'mathn' 2 / 3 => Rational(2,3) 2 / 3 * 3 => 2 While this might sometimes be quite neat, it's a nightmare if this gets required by some gem that...
...suddenly redefines integer division across your whole project. Known culprits are the otherwise excellent distribution and GetText gems (the later only when working with mo-files). To fix this, you...
...the kind of query). It may help to understand youtube's domain model before starting. It's best to just try out your requests in the browser to see what...
...key in order to make this request work): https://www.googleapis.com/youtube/v3/playlistItems?playlistId= &key= A&part=snippet&fields=nextPageToken,items(snippet(publishedAt,resourceId(videoId))) There are more examples and explanations in the...