...has its weak points, but I want to point out that it has clear strengths, too. Pro Simple and beautiful interface. Outstandingly organized source code. Have never seen a JS...
...toolbar buttons, pass various callbacks, etc. Features a collection of great plugins. Easily extendable by self-made plugins. It is really simple to write one – see example below.
If you have ... an object that defines to_hash (may well be a simple Hash instance) and pass it to a method with optional arguments and keyword arguments
...it is not set as the first optional argument. Instead, Ruby calls to_hash on the object and tries to match the result to keyword arguments. If the hash contains...
...need to use XPath, you can have Nokogiri help you out on creating it. Simply use Nokogiri's xpath_for: Nokogiri::CSS.xpath_for('#foo') # => ["//*[@id = 'foo']"] Nokogiri::CSS.xpath_for('#foo...
...bar:nth-of-type(2)') # => ["//*[@id = 'foo']//*[contains(concat(' ', @class, ' '), ' bar ') and position() = 2]"] Since XPath is more powerful you may still need to do some hardcore XPath hacking eventually...
...to mix different database dumps. It also requires that the mixed tables do not share relations to other database objects. Scenario You've got two database dumps: dump_a.pgdump dump_b.pgdump
...that the selected table(s) might depend upon. Therefore, there is no guarantee that a specific-table restore into a clean database will succeed. Valid restore To archive a complete...
When you are using the #selector_for helper in Cucumber steps, as e.g. Spreewald does, the following snippet will save you typing. It recognizes a prose BEM-style selector and...
...maps it to the corresponding BEM class. For a variation on this idea, see An auto-mapper for ARIA labels and BEM classes in Cucumber selectors. Examples "the main menu...
Just found out about a great feature in Rails that seems to be around since Rails 2. Start a console with the --sandbox (or -s) parameter: rails console --sandbox
...database will be rolled back on exit. Warning Changes beyond the database (deleting files, sending emails, etc) cannot be rolled back...
...take the content-box for the element's shape, i.e. without margin, padding and border. shape-outside: content-box Set the margin where you want it, e.g. 10px left and...
Set the shape-margin to the same size as the margin. Note that the shape-margin can never exceed the (rectangular) margin-box of an element! --margin: 10px;
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...
If you want to see how long your database queries actually take, you need to disable MySQL's query cache. This can be done globally by logging into a database...
SET GLOBAL query_cache_type=OFF; and restart your rails server. You can also disable the cache on a per query basis by saying SELECT SQL_NO_CACHE...
...test you can also use a handful of rake tasks to prepare the database structure directly. They can produce different results, though. In a nutshell, to ensure your test database...
...gains the correct structure: Don't use rake db:test:prepare carelessly or use rake db:test:clone_structure ← preferred :) or use rake db:migrate RAILS_ENV=test and don...
Sometimes you may want to print files from the command line, especially when you have lots of them. You can use lp for that. To print a single example.pdf file...
...on your default printer, simply say: lp example.pdf lp accepts multiple filenames, so to print all PDF files in the current directory: lp *.pdf You can specify a printer via...
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...
...AWS elasticache is memcached) telnet foohost23.cs2631.0001.euw1.cache.amazonaws.com 11211 Once you're connected, find out which 'slabs' exist within the cache: stats items STAT items:1:number 3550 STAT items:1:age...
...STAT items:1:evicted 0 STAT items:1:evicted_nonzero 0 STAT items:1:evicted_time 0 STAT items:1:outofmemory 0 STAT items:1:tailrepairs 0
The sprintf method has a reference by name format option: sprintf("% d : % f", { :foo => 1, :bar => 2 }) # => 1 : 2.000000 sprintf("%{foo}f", { :foo => 1 }) # => "1f" The format identifier % stands for...
...this example we are using %s identifier to replace strings. class Fetcher FIND_URI = 'https://someapi.com/3/search/record?query=% s&include_many=% s&language=en-US&page=1' # some public methods
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...
Situation: You want to write a spec for a function inside an Angular service. This function at some point makes an API request and acts upon response. Notably, your Angular...
...uiRouter, although it is not used nor actually required for this test. Working test setup # Capitalized expressions are intended to be replaced with YOUR values describe 'SERVICE', -> beforeEach -> module 'MODULE...
Chromedriver (or selenium-webdriver?) will not reliably scroll elements into view before clicking them, and actually not click the element because of that. We've seen this happen for elements...
...a 40px button). Our assumption is that the element is considered visible (i.e. Capybara::Selenium::ChromeNode#visible? returns true for such elements) but the Selenium driver wants to actually click...
This card shows you how to format a card's content using Markdown. We use the Commonmarker interpreter, so here are examples for its dialect. Formatting **Bold** Bold _Italics_
Add a new line for a paragraph. Headlines Underline headlines with an equals sign or dash -- or start a line with a hash symbol: Hello World ----------- Lorem ipsum...
See the attached link for a useful overview of modern (and classic) DOM API methods, like matches, contains, append, cssText, etc. You will still need to look up some documentation...
...e.g. on how to modify a ClassList, but it's still better than browsing interfaces and superclasses of Element on MDN without knowing what to look for. When coming from...
When a nginx reverse proxy complains about upstreams sending too big headers, tweaking the buffers responsibly can help to prevent this issue. Example log message: upstream sent too big header...
...while reading response header from upstream, client: 192.0.2.100, server: localhost, request: "GET /index.html HTTP/1.1", upstream: "http://198.51.100.123:80/index.html", host: "192.0.2.10:80" The cause This behaviour was caused by an application...
tl;dr: Do not use merge! for session hashes. Use update instead. Outline Let's assume you're modifying the Rails session. For simplicity, let's also assume your session...
...is empty when you start (same effect when there is data): # In our example, we're in a Rack middleware request = Rack::Request.new(env) request.session.merge! :hello => 'Universe' request.session => {} Wat?
Capistrano 3 is a major rework of the framework and requires several adjustments to your deploy configuration files. The biggest change is that they moved away from their custom DSL...
...release_roles|...) :some_role do Resources Very helpful, leads you 90% of the upgrade: https://semaphoreci.com/blog/2013/11/26/capistrano-3-upgrade-guide.html Official documentation Many examples of SSHKit...
You have an async function that rejects: async function failingFunction() { throw new Error("Something went wrong") } When you call that function in a test, your test will fail:
}) The failure message will look like this: Unhandled promise rejection: Error: Something went wrong You can fix this by expecting the state of the returned promise:
...lambdas in Ruby work, check out the code at the attached link. Here the summary: ^ ---------------------------- Section 6: Summary ---------------------------- So, what's the final verdict on those 7 closure-like entities...
...method Y closure yes The things within each of these groups are all semantically identical -- that is, they're different syntaxes for the same thing: 1. block (called with yield...