Installation of therubyracer fails with "undefined method `include_path'"
Today I ran into trouble installing therubyracer on Ruby 1.8. The installation failed with
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
...
What you need to know about Angular SEO
Search engines, such as Google and Bing are engineered to crawl static web pages, not javascript-heavy, client-side apps. This is typical of a search engine which does not render javascript when the search bot is crawling over web pages.
This is because our javascript-heavy apps need a javascript engine to run, like PhantomJS or v8, for instance. Web crawlers typically load a web page without using a javascript interpreter.
Are we out of luck for providing good SEO for our Angular apps? This article will show you exactly what you nee...
safe_cookies is now in public beta
We proudly release our safe_cookies middleware into public beta and just published it on Github.
Features are:
- make all application cookies
secure
andHttpOnly
(keeping them from being sent over HTTP and protecting them from Javascript) - rewrite all client cookies once, making them
secure
andHttpOnly
- notification if a request has unregistered cookies (no unsecure cookie will slip by)
- ability to ignore external cookies, like
__utma
and other tracking cookies - easy configurat...
Get Moving With Angular 1.2 Animation and Animate.css
Motion is quickly becoming one of the most important emerging techniques in building a quality user experience on the web. Angular 1.2, currently in release candidate form, provides an overhaul of Angular's animation system and makes it spectacularly easy to bring your interface to life.
International Address Fields in Web Forms :: UXmatters
Advice for address forms that work with address structures from multiple countries.
Stubbing out external services with an embedded Sinatra application
One of many useful techniques when your test suite needs to talk to a remote API.
Enable NewRelic monitoring [for Rails] on specific hosts only
If you need to enable NewRelic monitoring on certain machines within the same Rails environment, a simple solution is to utilize the respective hostnames of you machines.
For example, if you have 8 application servers (e.g. app1.example.com
, app2.example.com
, ...) and want to enable NewRelic on app1
and app2
only, utilize those steps to do so:
- Put the attached file into your config directory (
config/custom_new_relic_configuration.rb
). - Specify on which hosts NewRelic should be enabled (see
NEWRELIC_HOSTS
constant and list ...
Spreewald 0.6.7 "follow link in email"-step won't match backslashes any longer
When you build a link for an email body like this
body = "Please click the following link"
body << "http://posts/130\n\n"
body << "Members:"
...
then updating Spreewald to >=0.6.7 will be able to parse it correctly.
Spreewald 0.6.6 improves the Timezone switch
When you run into time zone issues e.g.
Given the time is "2011-11-11 11:11"
but
Time.now => ... 13:11
then updating Spreewald to >=0.6.6 might fix it.
Fix "An error occurred while installing debugger-linecache" with Ruby 1.9.3
You're better off using debugger-ruby_core_source
:
gem install debugger-ruby_core_source
If you can't do this, try the following.
Here is how to fix the following error when installing the debugger
gem fails:
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension
Note: The following example is for a project using Ruby 1.9.3-p448 -- adjust accordingly for your project.
-
Fetch the source for your Ruby version, if you do not yet have it:
rvm fetch ruby-1.9.3-p448
-
Install t...
Geordi: Choose your firefox version for cuc
Geordi 0.16+ supports running selenium tests with project-specific firefox versions.
Just update the gem. It will still default to using the old 5.0.1 firefox. If you want another one, add a file .firefox-version
to your project, containing your preferred version.
geordi cucumber
will prompt (and guide) you to install the given version. You can delete any old installation sitting in /opt/firefox-for-selenium
if you have one.
Speeding up ssh session creation
Establishing a new SSH connection usually takes only a few seconds, but if you’re connecting to a server multiple times in succession the overhead starts to add up. If you do a lot of Git pushing and pulling or frequently need to SSH to a dev server, you’ve probably felt the pain of waiting for SSH to connect so you can get back to doing work.
Implementing social media "like" buttons: Everything you never wanted to know
So you client has asked you to implement a row of buttons to like the URL on Facebook, Twitter and Google+. Here are some things you should know about this.
0. Security considerations
Each "like" button is implemented by including a Javascript on your site. This means you are running fucking remote code on your page. You are giving Facebook, Twitter and Google+ full permission to e. g. copy user cookies. Check with your client if she is cool with that. Also note that if you're site is suggesting security by operating under HTTPS ...
Enable CSRF protection in Javascript tests
You might not know that Rails disables CSRF protection in tests. This means that if you accidentally forget to send the CSRF token for non-GET requests, your tests will be green even though your application is completely broken (a failed CSRF check usually logs out the user). Rails probably does this because CSRF protection sort of requires Javascript.
You want to enable CSRF protection in Cucumber scenarios that can speak Javascript. To do so, copy the a...
Cucumber: Detect if the current Capybara driver supports Javascript
Copy the attached file to features/support
. This gets you a convenience method:
Capybara.javascript_test?
Is true
for Selenium, capybara-webkit, Poltergeist and a custom driver called :chrome
(which we sometimes like to use for Selenium+Chrome).
Similar sounding but completely different card: Detect if a Javascript is running under Selenium WebDriver (with Rails)
RailsPanel chrome extension
Chrome extension that shows all info from your rails log (like parameters, response times, view rendering times, DB requests) inside a chrome panel.
Rails 3/4: How to add routes for specs only
If you want to have routes that are only available in tests (e.g. for testing obscure redirects), you can use the with_routing
helper -- but that one destroys existing routes which may break a specs that require them to work.
To keep both "regular" and test routes, do this:
class MyApplicationController < ActionController::Base
def show
render text: 'Welcome to my application'
end
end
test_routes = Proc.new do
get '/my_application' => 'my_application#show'
end
Rails.application.routes.ev...
PostgreSQL vs. Rails migration: How to change columns from string to integer
When writing Rails migrations to convert a string
column to an integer
you'd usually say:
change_column :table_name, :column_name, :integer
However, PostgreSQL will complain:
PG::DatatypeMismatch: ERROR: column "column_name" cannot be cast automatically to type integer
HINT: Specify a USING expression to perform the conversion.
The "hint" basically tells you that you need to confirm you want this to happen, and how data shall be converted. Just say this in your migration:
change_column :table_name, :column_name, 'i...
ActiveRecord::StatementInvalid: Mysql2::Error: closed MySQL connection
I recently experienced the error ActiveRecord::StatementInvalid: Mysql2::Error: closed MySQL connection
. Apparently this happens when there is a timeout during query execution. In order to fix this you can reconnect to your db.
Therefore either add reconnect: true
to your database.yml for automatic reconnection when the error occurs or catch the error and manually and reconnect explicitly via ActiveRecord::Base.connection.reconnect!
Be aware that reconnecting will have the following impact on your current connection:
- Any active tr...
How to change the locale of a PostgreSQL cluster
There may be reasons to change the locale of your Postgres cluster. A popular one is your development system's locale being used by default (which may be annoying). Here is how to do that.
Beware: By following the steps below, you will drop and recreate your cluster. You will lose all data (including roles). Instructions below include a procedure for dumping and restoring all cluster data (including roles). While it worked at the time of writing, you should have extra backup strategies for a production database.
- Find the cluster you...
xfce - How do I finetune subpixel font anti-aliasing?
If your XFCE renders text with overly hard, thin lines instead of smooth anti-aliased lines, you might need to disable the LCD Filter as discribed in the linked article.
The Future of AngularJS
Presentation about awesome changes we can look forward to.