Install libreadline:

sudo apt-get install libreadline-dev

Reinstall the ruby and tell rvm where to find readline

rvm reinstall 1.8.7 --with-readline-dir=/usr/include/readline

Make sure you get a huge cup of tea before running the command above! It will take some time.

References

• github issue
• stackoverflow
• [rvm documentation](https://rvm.beginrescueend.com/pack...

Bundler 1.1 has been released. With this version you no longer need to wait for this:

Fetching source index…

The new Bundler is smarter and can fetch required metadata in a few seconds.

You can install the new version by saying:

sudo gem install bundler

If you get this:

Installing typhoeus (0.3.3) with native extensions
/usr/local/lib/site_ruby/1.8/rubygems/installer.rb:483:in `build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

/usr/bin/ruby1.8 extconf.rb 
checking for curl/curl.h in /opt/local/include,/opt/local/include/curl,/usr/include/curl,/usr/include,/usr/include/curl,/usr/local/include/curl... no
need libcurl

You can fix it by installing the libcurl3-dev package:

sudo apt-get install libcurl3-dev

Now you should...

Online tool to test how a site behaves in popular desktop, tablet and phone resolutions.

This article shows how to create a Sass mixin for a colored button. The button's foreground color is dynamically chosen between either black or white, depending on the given background color.

It's a nice intro into @if and @else conditionals in Sass.

If you want to know your public key's fingerprint, do this:

ssh-keygen -lf ~/.ssh/my.key.pub

This may be necessary to authenticate your key on GitHub because of recent events -- you need to do that if you get an error like this when talking to them (to pull etc):

ERROR: Hi foobear, it's GitHub. We're doing an SSH key audit.
Please visit https://github.com/settings/ssh/audit/...
to approve this key so we know it's safe.
Fingerprint: ab:cd:ef:...
fatal:...

1. Your current ruby must be Ruby Enterprise.
2. gem install passenger
3. passenger-install-apache2-module
4. Edit your httpd.conf according to the instructions provided at the end of the setup script.
5. Restart Apache: sudo service apache2 restart

This also works when you previously ran your Passenger using MRI. Just run the setup as described.

This only applies to RSpec below version 1.3.2. The issue has been fixed in RSpec 1.3.2, and most likely RSpec 2 and later versions.

When you have a helper that calls content_for and want to check its behavior you should probably write a feature instead. If you still want to do it, mind the following.

Consider this helper:

module LayoutHelper
  def title(string)
    content_for :title, string
    string
  end
end

Somewhere in the layout we'd then say something like this: `<%= yield :title %...</p>

Under Settings / Appearance you can uncheck a box Animate windows. This will change your life.

This setting seems to not exist anymore.

When trying to install the gherkin gem, you might encounter an error with the following lines:

ERROR:  Error installing gherkin:
	ERROR: Failed to build gem native extension.
...
checking for main() in -lc... yes
creating Makefile
...
cc1: all warnings being treated as errors
Makefile:150: recipe for target 'gherkin_lexer_ar.o' failed
make: *** [gherkin_lexer_ar.o] Error 1
...

If upgrading is not an option, configure build options for gherkin:

bundle config --local build.gherkin --with-cflags=-w

Your .bundle/config fi...

If you need to debug Analytics tracking, consider using this chrome extension. It will replace the tracking code with a debug version that prints debugging info to the JavaScript console.

Let's say you have two XML strings that are ordered differently but you don't care about the order of attributes inside containers:

a = '<?xml version="1.0" encoding="UTF-8"?><Authenticate><User>batman</User><Password>secret</Password></Authenticate>'
b = '<?xml version="1.0" encoding="UTF-8"?><Authenticate><Password>secret</Password><User>batman</User></Authenticate>'

Working with plain string comparison is not helpful, of course:

a == b
=> false

Instead, you can use the Nori gem ...

When branches get deleted on origin, your local repository won't take notice of that.

You'll still have your locally cached versions of those branches (which is actually good) but git branch -a will still list them as remote branches.

You can clean up that information locally like this:

git remote prune origin

Your local copies of deleted branches are not removed by this.

The same effect is achieved by using (kudos to Julien):

git fetch --prune

You could also set that as a default.

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_

Italics

`Monospaced`

Monospaced

> Quoted text

Quoted text

Here is [a link](http://makandra.com/).

Here is a link.

![An image; this is the alt text](http:/...

Undeterministically I got a nil error on saving the object caused by the random order of hash elements of the params hash.

class Feedback
  belongs_to :user

  def role=(value)
    @role = value
    self.email = find_email_by_name(user.name)
  end
end

This piece of code works well until the object params hash contains a second element when it is updated like this:

@feedback.update_attributes!(params[:feedback])

Now it is no longer ensured that user was set before name was set. If the name...

Developers these days are spoiled with choice when it comes to selecting an MV* framework for structuring and organizing JavaScript web apps. Backbone, Spine, Ember (SproutCore 2.0), JavaScriptMVC... the list of new and stable solutions goes on and on, but just how do you decide on which to use in a sea of so many options?

To help solve this problem, we created TodoMVC - a project which offers the same Todo application implemented using MV* concepts in most of the popular JavaScript MV* frameworks of today.

Solutions look and feel the same...

Let's say you need to revert a migration that happened a while back. You'd create a new migration that removes what was added back then in the up path, while its down path restores the old functionality.

While you could just copy&paste the down and up parts of it to the inverse part of the new migration, you may not want to do that. Especially when the up/down paths already contained some logic (that executed update statements on the created column, for example), copying does not feel right.

Someone already added the logic how to...

You are looking for a functionality in RubyMine but don't know or remember its keyboard shortcut or which menu it is located in?\
Hit Ctrl+Shift+A.

This will bring up the "Find Action" box where you can enter an action's name or category. Pick the result from the list to run it.

The list of results will also show you any assigned keyboard shortcuts.

RubyMine offers you to exclude directories from search, meaning faster search results and less "noise" in the list of result.

Right-click a folder in your project tree and click "Mark Directory As" → "Excluded".

Do it for your your log, data, and other directories that you don't need to access during development and whose search results are irrelevant.
They won't be deleted but simply ignored when searching across a project's files.

![](https://makandracards.com/makandra/6635-rubymine-exclude-data-and-log-directories-from-a-project/atta...

Instead of showing you two lines for each change, Git allows you to highlight changes in a line explicitly:

git diff --word-diff some_file

Hello [-world-]{+universe+}!

(The result is usually colored nicely, the removed part being red and the added text green.)

When doing a diff on a long line, this can be very helpful but you'll still get a less-like scrolling output that can be unhandy to use.\
You maybe just want the diff put into your terminal:

PAGER='' git diff --word-diff some_file

When updating WebMock, be prepared that your specs may send real requests into the depths of the internet unless you update Curb as well.\
WebMock will not complain about those requests not being stubbed.

One of the commits that made it into 1.8.0 actually breaks Curb versions below 0.7.16 while fixing it for that version (and above, hopefully).\
WebMock's hooks for Curl::Easy are sti...

TeamViewer 6 and lower had an issue where they would see a multi-monitor Linux setup as a single wall of pixels. This is fixed in version 7. The guest can now select the currently active screen from the TeamViewer menu.

will_paginate triggers a database query to determine the total number of entries (i.e. to let you display the number of search results). When you paginate complex scope (e.g. that has many includes), this query may take several seconds to complete.

If you encounter this behavior, a solution is to calculate the total count yourself and pass it to the pagination call:

scope = User.complex_scope_full_of_includes
total_number_of_users = scope.count
@users = scope.paginate(:total_entr...

We experienced problems with Sunspot and Solr on Tomcat: Umlauts (ä, ö, ü) were not correctly handled on Tomcat while everything was okay on the local development machines (your local Sunspot service you start with the sunspot:solr:run task is based on Jetty).

We use a stemmer that reduces "Sänger" to "sang" and "Sanger" to "sang" as well.
Though, results for "Sänger" where empty on Tomcat.

This is due to a UTF-8 bug in RSolr (see Github for some discussion on that).
The bug is fixed in a ...