Capybara uses www.example.com as the default hostname when making requests.
If your application does something specific on certain hostnames and you want to test this in a feature, you need to tell Capybara to assume a different host.

Given /^our host is "([^\"]+)"$/ do |host|
  page.config.stub app_host: "http://#{host}"
  
  # In older Capybaras (< 2.15) you needed to do this instead:
  Capybara.stub app_host: "http://#{host}"
end

You can now say:

When I go to the start page
Then I should not see "Home ...

If you're trying to searching or installing packages via pkg the your repository data might be broken. If pkg update shows that your repositories are up to date try:

pkg update -f

Afterwards you should be able to search and install packages again.

Helix allows you to implement performance-critical code of your Ruby app in Rust, without requiring glue code to bridge between both languages.

See attached article for a longer write-up about the why and how.

• Util
• CLI

When building a form with a file select field, you may want to offer your users a live preview before they upload the file to the server.

HTML5 via jQuery

Luckily, HTML5 has simple support for this. Just create an object URL and set it on an <img> tag's src attribute:

$('img').attr('src', URL.createObjectURL(this.files[0]))

Unpoly Compiler

As an Unpoly compiler, it looks like this:

up.compiler '[image_p...

This gem gives you a rake task db:seed:dump do create a db/seeds.rb from your current database state.

The generated db/seeds.rb will look this:

Product.create!([
  { category_id: 1, description: "Long Sleeve Shirt", name: "Long Sleeve Shirt" },
  { category_id: 3, description: "Plain White Tee Shirt", name: "Plain T-Shirt" }
])
User.create!([
  { password: "123456", username: "test_1" },
  { password: "234567", username: "test_2" }
])

When your application crawls twitter profiles for tweets, it might throw HTTP 401 (Unauthorized) errors.

Those can happen for a number of reasons, one of them obviously being incorrect credentials.
However, 401 is also returned when crawling profiles that no longer exist.

True story.

Cucumber's docstrings let you add long strings to a step like this:

# foo.feature
Given this text:
"""
First line
Second line

Second Paragraph
"""

# foo_steps.rb
Given /^this text:$/ |docstring|
  puts docstring.split
end

You see these neat triple double quotes ("""). Now what to do when you need your docstring to contain triple double quotes, too?

# Does not work:
Given this text:
"""
Docstrings work like this:
  """
  Docstring example
  """
You see?
"""

Update: Official solution

You can escape the inner quotes ...

Instead of using this hack you might want to use MariaDB 10.x which can work with both old and new apps.

An alternative could be to use the MySQL Docker image which is still updated for 5.6.

Ubuntu 16.04 only provides packages for MySQL 5.7 which has a range of backwards compatibility issues with code written against older MySQL versions.

Oracle maintains a list of official APT repositories for MySQL 5.6, but those repositories do...

Tool to show you which gems are slow to load:

➜  git:(master) ✗ bundle exec bumbler
[#################################################                             ]
(49/65) travis-lint...
Slow requires:
    110.21  render_anywhere
    147.33  nokogiri
    173.83  haml
    179.62  sass-rails
    205.04  delayed_job_active_record
    286.76  rails
    289.36  mail
    291.98  capistrano
    326.05  delayed_job
    414.27  pry
    852.13  salesforce_bulk_api

Showing various caching patterns. Includes WhatsApp screenshots.

OAuth requires a set of params to be carried along requests, among which a nonce. Some libraries pass these along as headers, some as query parameters. All fine.

When you're using VCR, the latter case is an issue. By default, requests are matched on method and URI. However, no request URI will equal another when they include a nonce. You won't be able to match these requests with VCR.

Solution

Obviously you need to...

Awesome is a very good tiling window manager that provides neat features like automatic layouting of windows, good multi-display support with per display workspaces and more. Since it is only a window manager, you will probably miss some of MATE's conveniences like the network manager, application menus, automatic updates etc.

Fortunately, you can run Awesome within MATE, by following these steps (tested on Ubuntu MATE 16.04):

Awesome + MATE

• Create the followi...

If you want to access top-level constants inside a BasicObject class, you need to prefix them with ::.

This will not work

class Foo < BasicObject
  def bar
    Hash.new
  end
end

Foo.new.bar # => NameError: uninitialized constant Foo::Hash

You need to explicitly write ::Hash.

The reason is that top-level constants are internally attached to Object, so Hash is not in the lookup chain inside a BasicObject.

When creating an index using CREATE INDEX, Postgres will create a B-Tree type index by default. The B-Tree type is great for general purpose indexes but there are special cases when other types provide better results.

Spreewald has steps that let you test that e-mails have been sent, using arbitrary conditions in any combination.

The attached file is for legacy purposes only.

You can use JavaScript to get or set cookie values on the client.

Using the vanilla JavaScript API

In JavaScript, document.cookie is an accessor to all cookies on the current site. It looks like a String, but its setter is actually more powerful.

When setting cookies this way, remember to set the path=/ option.

Reading cookies

A result may look like this:

hello=universe; foo=bar

This means that there are 2 cookies: "hello" with value "universe", and "foo" with value "bar...

Git commands tend to come in groups. Avoid typing git over and over and over by running them in a dedicated git shell.

You might want to run git config --global help.autocorrect true before using gitsh. This will silently swallow a muscle-memory "git" prefix to your commands inside the git shell.

The NestedHash class allows you to read and write hashes of any depth. Examples:

hash = {}
NestedHash.write hash, 'a', 'b', 'c', 'value' # => { a: { b: { c: 'value' } } }
NestedHash.read hash, 'a', 'b', 'c' # => 'value'
NestedHash.read hash, 'a' # => { b: { c: 'value' } }
NestedHash.read hash, 'foo', 'bar' # => undefined

Inspired by victusfate.

Code

class @NestedHash

  @read: (objekt, keys...) ->
    if objekt and keys.length
      @read objekt[keys[0]], keys[1...]...
    ...

You can find out about disk space usage of all tables within your database by running this:

SELECT table_name AS `Table`, round(((data_length + index_length) / 1024 / 1024), 2) `Size (MB)` FROM information_schema.TABLES WHERE table_schema = "$your_database";

Replace $your_database here.

To find out the disk usage of a single column:

SELECT sum(char_length($your_column))/1024/1024 FROM $your_table

Result is in megabytes again.

Enter any command into explainshell and it will explain it to you: split into separate commands (if present), with each option explained.

About

Hello,
This site contains 29761 parsed manpages from sections 1 and 8 found in Ubuntu's manpage repository. A lot of heuristics were used to extract the arguments of each program, and there are errors here and there, especially in manpages that have a non-standard layout.
It is written in Python and uses bashlex, a bit of NLTK (to find the interesting parts of the manpage), a little d3....

To delete a local branch

git branch -d the_local_branch

To remove a remote branch (if you know what you are doing!)

git push origin :the_remote_branch

or simply use the new syntax (v1.7.0)

git push origin --delete the_remote_branch

Note

If you get the error

error: unable to push to unqualified destination: the_remote_branch
The destination refspec neither matches an existing ref on the remote nor
begins with refs/, and we are unable to guess a prefix based on the source ref.
error: failed to push some ref...

Sometimes you might want to check a short link for it's destination before clicking on it. Additional you get information about the redirects.

Use the magic + at the end of the short url!

Google:
https://goo.gl/TXe0Kx => https://goo.gl/TXe0Kx+
Since the original publication of this post, Google's URL shortening service goo.gl has been discontinued.

Bitly:
http://bit.ly/1VRwNVt => [http://bit.ly/1VRwNVt+](http:/...