Add gem 'database_cleaner' to your Gemfile. Then:

Cucumber & Rails 3+

# features/support/database_cleaner.rb

DatabaseCleaner.clean_with(:deletion) # clean once, now
DatabaseCleaner.strategy = :transaction
Cucumber::Rails::Database.javascript_strategy = :deletion

Cucumber & Rails 2

The latest available cucumber-rails for Rails 2 automatically uses database_cleaner when cucumber/rails/active_record is required -- but only if transactional fixtures are off. To have database_cleaner work correctly:

1. Add the at...

When navigating back to a page that was received from a POST request, undesired side effects may happen. Therefore, modern browsers try to keep users from doing so, i.e. Firefox 24 displays an error page explaining what's wrong. If the user presses "Try Again", it shows an additional alert asking whether the user is certain.

Solution

If you need to circumvent this protection, e.g. to test that your application behaves correctly despite being misused, do this:

page.execute_script 'history.back()'
page.execute_script 'retryThis(this)...

Just run git show branch:file. Examples:

git show HEAD~:bin/command
git show origin/master:../lib/version.rb

ImageMagick takes a string with several options when cropping an image. See the command line options for how to provide the expected image geometry for details.

Note that ImageMagick tends to preserve the original aspect ratio of the source image automatically.

Examples:

• crop 200x200 means Maximum values of height and width given, aspect ratio preserved.
• crop 200x200! means Width and height emphatically given, original aspect ratio ignored.

In the tradition of our PostgreSQL cheat sheet for MySQL lamers, here is a cheat sheet for Jasmine when you're used to RSpec.

Note that Jasmine syntax has changed with Jasmine 2, so if you're using Jasmine 1.x you might instead want to use an older cheat sheet.

Expectations

# RSpec
expect(foo).to.eq("value")
expect(foo).to_not eq("value")

# Jasmine
expect(foo).toBe("value")
expect(...

When testing code that uses pushState / replaceState, your browser will appear to navigate away from http://localhost:3000/specs (or wherever you run your Jasmine tests). This is inconvenient, since reloading the document will no longer re-run the test suite.

To remedy this, copy the attached file to a place like spec/javascripts/helpers and #= require it from your tests. It will store the current location before every test and reset if afterwards (using location.replaceState).

1. Run bundle update cucumber capybara cucumber-rails to update to the newest versions.

2. Backup your features/support/path.rb to be able to add your own paths again after the cucumber installation script in step 4.

3. Backup your features/support/env.rb file to be able to reintegrate parts like your blueprints setup:

   ENV["RAILS_ENV"] ||= "cucumber"
   require File.expand_path(File.dirname(__FILE__) + '/../../config/environment')
   require 'spec/support/blueprints'
   

4. Run `$ rails generate cucumber:install --capyba...

Angular 1.3+ has an alternative getter/setter pattern: You can bind ng-model to an accessor function. This is a function that is either a getter (when it gets no arguments) or a setter (when it gets the new value as an argument):

$scope.name = function(newName) {
  return angular.isDefined(newName) ? (_name = newName) : _name;
}

You need to bind this function with ng-model and `ng-model-options="{ getterSette...

JavaScript objects can have getter and setter functions that are called when a property is read from or written to.

For example, if you'd like an object that has a virtual person.fullName attribute that dynamically composes person.firstName and person.lastName:

var person = {

  firstName: 'Guybrush',

  lastName: 'Threepwood',

  get fullName() {
    return this.firstName + " " + this.lastName;
  },
  
  set fullName(name) {
    var parts = name.split(" ");
    this.firstName = parts[0];
    this.lastName = parts[1];
  }

};
`...

This is a problem when using Selenium with Firefox. We recommend using ChromeDriver for your Selenium tests.

This setup allows to test focus/blur events in Cucumber tests (using Selenium). For background information, see How to solve Selenium focus issues.

Cucumber step definition:

# This step is needed because in Selenium tests, blur events are not triggered
# when the browser has no focus.
When /^I unfocus the "(.*?)" field to trigger ja...

Capybara-screenshot can automatically save screenshots and the HTML for failed Capybara tests in Cucumber, RSpec or Minitest.

Requires Capybara-Webkit, Selenium or poltergeist for making screenshots. Screenshots are saved into $APPLICATION_ROOT/tmp/capybara.

Manually saving a page

Additionally you can trigger the same behavior manually from the test using Capybara::Session#save_and_open_page and [...

Rails includes a way to see what an e-mail will look like.

Integration to RSpec

All you need to do is implement a preview-class in spec/mailers/previews/notifier_preview.rb:

class NotifierPreview < ActionMailer::Preview
  def welcome
    Notifier.welcome(User.first)
  end
end

And adapt the preview load path in your application.rb:

config.action_mailer.preview_path = "#{Rails.root}/spec/mailers/previews" # For Rails < 7.1
config.action_mailer.preview_paths << "#{Rails.root}/spec/mailers/previews" # For Rails >=...

You can do so much more than console.log(...)! See the attached link for a great breakdown of what the developer console can give you.

Some of my favorites:

console.log takes many arguments

E.g. console.log("Current string:", string, "Current number:", 12)

Your output can have hyperlinks to Javascript objects

E.g. console.log("Check out the current %o, it's great", location)

[Di...

Rails guide that covers PostgreSQL-specific column types and usages for Active Record.

You should especially keep in mind the special datatypes that PostgreSQL offers. \
Types like json and array take away a lot of the pain that you had on MySQL projects.

Example use cases for array are tags or storing foreign keys (instead of a join model). You can even index them.

capybara_element['attribute_name'] allows accessing an element's attributes in Capybara.

A few examples:

find('#my_element')['class']
# => "first-class second-class"

find('#my_input')['placeholder']
# => "My placeholder value"

find('a#example-link')['href']
# => "http://example.com"

find('#my_element')['missing_attribute']
# => nil

Cucumber will clean up files you've uploaded in your Cucumber features automatically with the attached code. Put the file in features/support/.

RSpec::Matchers.define :be_naturally_sorted do
  match do |array|
    array == array.natural_sort
  end
end

See RSpec: Where to put custom matchers and other support code. To use natural_sort, see this card.

This matcher is now part of Spreewald.

This step will pass if the specified select is sorted.

Then /^the "(.*?)" select should be sorted$/ do |label, negate|
  select = find_field(label)
  options = select.all('option').reject { |o| o.value.nil? }

  options.collect(&:text).each_cons(2) do |a,b|
    (a.text.downcase <=> b.text.downcase).should <= 0
  end
end

In conjunction with this custom matcher, the each_cons block can be replaced with:

options.should be_naturally_sorted

Usage

Then the "Organizations" select should be sorted...

Chances are you're seeing the warning repeated a lot of times, maybe thousands of times. Here's how to reproduce the issue:

Example 1

# bad code
(Time.current .. Time.current + 1.hour).include?(Time.current)

# Use Range#cover? instead of Range#include? since the former does no typecasting into integers.
(Time.current .. Time.current + 1.hour).cover?(Time.current)

Example 2

# bad code
Post.where(:created_at => min_date.beginning_of_day .. max_date.end_of_day)

# Use 'BETWEEN x AND y'
Post.where(['posts.created_at BETWEEN...

Sometimes you want Angular to watch an object only until a certain state is reached (e.g. an object appears in the scope).

Angular's $watch returns a method that you can call to remove that watch. For example:

unwatch = $scope.$watch 'user', (user) ->
  if user?
    ... # do something
    unwatch()

That's it.

Copy data from LibreOffice Calc

When you copy data from multi-line cells in LibreOffice Calc, quotation marks are automatically added, which you may not want.

For example with license keys:

09:46:24 [✔] pascal:~> icdiff license license_copy 
license                           license_copy                           
===== LICENSE BEGIN =====         "===== LICENSE BEGIN =====             
00000yIeXfhGSbt"yULWQR9n          00000yIeXfhGSbt""yULWQR9n        
olysFAv105bHmKOiqbxRX"Yr  ...

The Rails asset pipeline improves delivery of application assets (javascripts, stylesheets, images, fonts). Here are some basic facts about its inner workings.

No magic

Manifests are the handle on your assets:

app/assets/stylesheets/application.css # use via: stylesheet_link_tag 'application'

The asset pipeline only considers files you explicitly require within your manifest files. The most common directives used in manifests are require some/file and require_tree some/directory. Paths may be **relative to the current director...