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...
In Rubocop you might notice the cop Style/CaseEquality for e.g. this example: def foo(expected, actual) expected === actual end In case expected is a Regex, it suggests to change it...
...foo(expected, actual) expected.match?(actual) end In case expected is a Regex or a String, you need to keep ===. Otherwise the actual expression is always converted to a regular expression...
You can scale background images in CSS to the container size using background-size (Demo). Commonly, we use contain or cover because we want to preserve the image's aspect...
If you do not want to do that, simply provide scaling values for X and Y: background-size: 100% 100% (a simple 100% would mean 100% auto and respect...
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...
gem install foobar --version="=2.3.0.alpha2" Also bundle update will never update a stable version to a pre-release version unless the user explicitly requests it in the Gemfile...
...gem 'foobar', '=2.3.0.alpha2' A note on Semantic Versioning Semantic Versioning has a naming convention for pre-releases that is incompatible with that from RubyGems. In Semantic Versioning, the version...
...you want to clean up this code with the modularity gem, you might try something like this: class Foo does 'bar' end module BarTrait as_trait do class Bar
...you would have to change all references accordingly, which is quite unpleasant. You can solve it like that: module BarTrait as_trait do class self::Bar end end end
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
Web forms can be made much more usable with a few HTML attributes. Short summary: type: Tells browsers about the input data type. Mobile browsers will select a virtual keyboard...
...based on this value. Some browsers will add simple validation, e.g. for type email. inputmode: Direct hint about the virtual keyboard to use. Inferred from type, but can be very...
...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...
Sometimes I ran across a GitHub merge request of a gem where it was not completely obvious in which version the change was released. This might be the case for...
Git can help you to find the next git tag that was set in the branch. This usually has the name of the version in it (as the...
It is possible to manipulate the forwarded ports of an established interactive SSH session. This is done by opening the command line with the escape character ~C. This will open...
...a ssh> prompt. If it doesn't, make sure it's the first character in a line, i.e. press enter first. You have following commands at your disposal
...flaky tests. You should always try to fix those instead of rerunning them regularly. Setup Configure RSpec to persist the result of your test runs to a file. This is...
...necessary to be able to rerun examples. Add this to your spec/spec_helper.rb : config.example_status_persistence_file_path = 'spec/examples.txt' Rerun all failed examples using --only-failures bundle exec rspec --only-failures...
...lot less than you think. "private" does not apply to class methods defined on self This does not make anything private: class Foo private def self.foo 'foo' end end
...need to use private_class_method instead: class Foo def self.foo 'foo' end private_class_method :foo end "private" does not apply to define_method This does not make anything...
You can say: $(element).is(':visible') and $(element).is(':hidden') jQuery considers an element to be visible if it consumes space in the document. For most purposes, this is...
Emulate jQuery's implementation : element.offsetWidth > 0 && element.offsetHeight > 0; jQuery > 3 Query 3 slightly modifies the meaning of :visible (and therefore of :hidden). Emulate jQuery's implementation: !(window.getComputedStyle(element...
Ruby's regular expressions can be represented differently. When serializing them, you probably want to use inspect instead of to_s. For the examples below, consider the following Regexp object...
>> regexp.to_s => "(?mi-x:^f(o+)!)" inspect As the Ruby docs say: Perhaps surprisingly, #inspect actually produces the more natural version of the string than #to_s...
...IDENTIFIED BY 'some_password'; GRANT REPLICATION SLAVE ON *.* TO 'replicator'@'%'; Adjust MySQL configuration Edit /etc/mysql/my.cnf: server-id = 1 log_bin = /var/log/mysql/mysql-bin.log replicate-do-db = some_project_production replicate-do-db...
...other_project_production replicate-ignore-db = mysql server-id needs to be unique among all connected master and slave servers. When replicate-do-db is provided only the chosen databases...
...file download links in an end-to-end test can be painful, especially with Selenium. The attached download_helpers.rb provides a download_link method for your Capybara tests. It returns a...
details[:disposition] # => 'attachment' or 'inline' details[:filename] # => 'report.txt' details[:text] # => file content as string details[:content_type] # => 'text/plain' Features Compared to other approaches this helper has many useful features...
# the value from the form field's ngModel (which means it's not sent to the # server, and old values would not be overwritten). # # This directive makes sure that...
...form fields with an invalid value return an # empty string instead of undefined. for elementType in ['input', 'textarea', 'select'] @app.directive elementType, -> priority: 1 restrict: 'E' require: '?ngModel' link: (scope, element...
...unwrap(). Here is how. Consider the following example element. $container = $(' Hello World ') Let's say we want to discard any tags, but keep their contents. Simply find them, then dive...
When using state_machine you sometimes need to know whether an object may execute a certain transition. Let's take an arbitrary object such as a blog article as an...
...example that has those states: A -> B -> C -> D Additionally, you have transitions between the states as shown above. Let's call the transition between 'A' and 'B' transition_ab...
...exactly(building, other_building) expect(unit.assignable_buildings).not_to include(unauthorized_building, nil) end ... See RSpec: Where to put custom matchers and other support code
...alias such as this to your ~/.bashrc: alias recent-branch="git for-each-ref --sort=-committerdate --format='%(refname:short)' refs/heads/ | fzf | sed 's/\* //g' | xargs -I '{}' git checkout {}"
Now whenever you want to switch back and forth between your most recent branches, type recent-branch, select one and press enter...