...a?(String) && value.blank? - nil - else - value - end activerecord/lib/active_record/connection_adapters/column.rb + def type_cast_for_write(value) + return value unless number? + + if value == false + 0 + elsif value == true + 1 + elsif value.is_a?(String...

...die grundsätzlichen "Bestandteile" von iptables Tables Chains Rules Targets Du verstehst was drop, reject, return und accept machen. Du kennst die 4 default tables Wie kannst du dir iptables Regeln...

...call Nokogiri::HTML to be more liberal about accepting invalid XML. xml / 'list item' returns all matching nodes; list item is used like a CSS selector xml / './/list/item' also returns...

...an XPath selector XPath seems to be triggered by a leading . or / xml % 'item' returns the first matching node node.attribute('foo') returns the attribute named foo node.attribute('foo').value returns...

git name-rev --tags Note The more commonly used git describe command will return the last tag before a commit, git name-rev the next tag after the commit...

...jQuery (but before jquery-ujs): whitelisted = (url) -> for domain in ["http://trusted.host/", "https://another.trusted.host/"] return true if url.indexOf(domain) == 0 false $.ajaxPrefilter (options) -> if whitelisted(options.url) options.crossDomain = false

The attached download_helpers.rb provides a download_link method for your Capybara tests. It returns a hash describing the download's response: details = download_link('Download report') details[:disposition] # => 'attachment...

foo bar baz Hello Universe without :scope A simple document.body.querySelectorAll('div') will return a NodeList with 5 items, i.e. all 5 divs from above. with :scope Using document.body.querySelectorAll...

...secret folder with its contents. def migrate! correct_store_path = Pathname.new(new_store_dir) return if correct_store_path.directory? # already moved if the directory exists, nothing to do parent_path = correct_store_path.parent # this...

...path like "./foo.coffee". // The call to "substring" removes the "./" prefix. let preparePath = function(filePath) { return filePath.substring(2); }; modelFiles = require.context('js/models', true, /\.(js|coffee)$/); for(let filePath of modelFiles.keys()) { import(`js/models...

...callback this list might help you to fix your code afterwards: attribute_changed? will return true in the after_save callback and false in the after_commit callback. Use something...

...write something similar using jQuery.grep. let classes = Array.from($element.prop('classList')) let existingModifiers = classes.filter(className => { return className.match(/^is-/) }) $layout.removeClass(existingModifiers.join(' ')) Note that classList is native DOM API and returns a DOMTokenList...

...read: forever) you may pass a function that disects an element's class, and returns a string that will then be removed through the "classic" string approach. It's a...

...Summary ---------------------------- So, what's the final verdict on those 7 closure-like entities? "return" returns from closure True closure? or declaring context...? Arity check? --------------- ----------------------------- ------------------- 1. block (called with yield) N...

...block (&b => f(&b) => yield) N declaring no 3. block (&b => b.call) Y except return declaring warn on too few 4. Proc.new Y except return declaring warn on too few...

...into your ~/.config/awesome/rc.lua. It supplies two methods: execute_command will run a command and return its output. Multiple lines will be joined into one line. The code is from the...

...method that takes a command to run and a timeout in seconds. It'll return an object which contains a widget that you can put into your panel. ^

If you do not provide a block to find_each, it will return an Enumerator for chaining with other methods: Person.find_each.with_index do |person, index| person.award_trophy(index...

...in mind that their syntax is a bit different. UnderscoreJS In UnderscoreJS, methods always return a value: x = [1, 2, 2] _.uniq(x) // => [1, 2] _(x).uniq() // => [1, 2]

...chain, and call value() to terminate the chain. _.chain(x).uniq().map(function(i) { return i + 10 }).reverse().value() // => [12, 11] LoDash In LoDash, methods called from _ (like _.uniq) will...

var languageString = navigator.language || navigator.userLanguage || ''; var language = languageString.split(/[_-]/)[0]).toLowerCase(); switch (language) { case 'de': return "/de/"; case 'en': return "/en/"; default: return "/en/"; } })(); Note that old IEs support only navigator.userLanguage...

...which returns the regional setting of the operating system. Fallback For users without JavaScript, you may want to redirect them to your default locale. Do that by adding a meta...

...called an “inversion of control”. A function that accepts a callback instead of a return value is saying, “Don’t call me, I’ll call you.”. Promises un-invert the...

...Edge, there are polyfills for Internet Explorer. Usage: Usage Assume this piece of code returns a promise: api.get('pages') // => Promise You may now chain function calls to the promise using...

With this, the scope chain Meal.for_date(Date.today).suitable_for(current_user) would return all meals, not only those of today. Do this instead: def self.suitable_for(user)

...for Rails 2 use `scoped({})` instead of `all` end end Note how we're returning #all instead of self. This ensures that we're preserving the upstream scope chain...

...message to be set, like this: savon.expects(:action_name).with(message: { user_id: 123 }).returns(' ') If you want to stub only the returned XML and do not care about request...

...you can not omit with as Savon's helper will complain: savon.expects(:action_name).returns(' ') ^ Savon::ExpectationError: Expected a request to the :action_name operation with no message.

...doesn't, and that's what causes pain. The method is defined as follows: # Returns whether or not +file+ is a binary file. Note that this is # not guaranteed to...

...raised for characters that are undefined in UTF-8. def is_file_binary?(path) return false unless File.binary?(path) content = File.read(path) content&.encode('UTF-8', 'binary') true rescue Encoding...

>> user.errors.of_kind?(:email, :taken) => true Using added? without specifying options will return false: >> user.errors.added?(:email, :taken) => false >> user.errors.added?(:email, :taken, value: "user@example.com") => true Most often, you probably...

...run some_expensive_calculation every time you call var_value if some_expensive_calculation returns nil. This illustrates the problem: def some_expensive_calculation puts "i am off shopping bits...

...shorthand vor "nil or undefined", so if you want to cache something that can return nil, you can not use it. You will have to check for 'defined?' only, ignoring...

Returning an empty scope can come in handy, e.g. as a default object. In Rails 4 you can achieve this by calling none on your ActiveRecord model. MyModel.none # returns an...

The Angular 1.2 way: # By default, angular returns undefined for invalid attributes which removes # the value from the form field's ngModel (which means it's not sent to the...

...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, ->