[Ruby] How to Configure RVM Ruby Version for Default Use

Using rvm use --default to make an RVM-installed Ruby the default in every new terminal session.

[Oracle] Automatic Sequential Number Generation Method

Using Oracle sequence objects with NEXTVAL / CURRVAL for auto-numbering.

[Node.js] How to Install Version Management Tool nodebrew on Mac

Installing the nodebrew Node.js version manager on Mac and troubleshooting the errors along the way.

[ZF] Subqueries in FROM / WHERE Clauses with Zend_Db_Select

Reference links for writing FROM / WHERE subqueries with Zend_Db_Select.

How to Change Form Action with JavaScript and jQuery

Minimal sample code for changing a form's action attribute with vanilla JavaScript and jQuery.

[JavaScript][jQuery] How to Get DOM Elements

How to get a raw DOM Element from a jQuery object with .get(0), alongside the vanilla getElementById equivalent.

For Facebook API Research and Questions, 'Facebook Stack Overflow' is Recommended

For Facebook API research and questions, Facebook Stack Overflow is the recommended resource.

How to Build an Authenticated Staging Environment with Heroku + Rails

Build a Basic-auth-protected Rails staging environment on Heroku alongside your production app.

Must-See Support Site for Facebook Developers: 'fb.developers'+'

A quick introduction to fb.developers'+, a Japanese-language support site for Facebook developers.

[PHP] How to Check the Output Directory of error_log

Use php -i and grep to find where PHP writes its error_log.

[Eclipse] Shortcut Key for Line Number Jump

A quick memo on the Ctrl + L shortcut to jump to a specific line number in Eclipse.

[JavaScript] How to Use a href="" onclick

Avoiding the href="#" onclick anti-pattern in JavaScript, with good and bad examples.

Article That Clearly Explains the Differences and Usage Between rpm and yum

External references explaining the differences and usage between rpm and yum for Linux package management.

[PHP][PEAR] Solution for 'Column count of mysql.proc is wrong.' Error

Digging up the real cause behind a PEAR::DB "unknown error" via getDebugInfo().

[Symfony1.4][Validator] How to Create Custom Validators

Building a Symfony 1.4 custom validator that checks ISBN-10 / ISBN-13 length and characters.

[Symfony1.4] csrf token: Required.

How I fixed the `csrf token: Required.` error in Symfony 1.4 by rendering the form's hidden fields.

[Facebook] Page Width of Page Tab Apps/Canvas Apps

A quick reference for the page width of Facebook Page Tab apps (520px) and Canvas apps (760px).

How to Enable Facebook App Cookies in IE

Fix third-party cookie loss in Facebook iframe apps on IE by sending a P3P policy header (Rails / PHP).

Heroku-ja Meetup #1 Slide Summary

A roundup of slide decks presented at Heroku-ja Meetup #1, covering Salesforce, Lokka, and more.

[Facebook App] JavaScript SDK Must Always Be Used with https

Why you should always load the Facebook JavaScript SDK over https to avoid mixed-content issues, especially in IE.

[JS] How to Check if jQuery is Loaded

A short sample using the typeof operator to check whether jQuery has been loaded.

[Rails] How to Redo db:migrate to Heroku's Default PostgreSQL

Three ways to force db:migrate to run again on Heroku when rake db:reset is not available.

[Facebook API] Function setAutoGrow() to Remove Scroll Bars in IFrame Tab Pages

Hide scroll bars on Facebook iframe tab pages by moving from setAutoResize to FB.Canvas.setAutoGrow().

[Mail] Slide Material for Easy Understanding of Email Systems

A link memo for a SlideShare deck that explains the basics of email systems, '#Mailerstudy'.

[Facebook] Upgrade Your App to OAuth 2.0 and HTTPS by October 1st

The Facebook email announcing that OAuth 2.0 and HTTPS became mandatory for all apps from October 1, 2011.

Amazon Product Advertising API Specification Changes to be Implemented on October 26, 2011 (Wednesday)

An announcement that the Amazon Product Advertising API spec changes will roll out on October 26, 2011 as planned.

[Linux] Batch Change File Name Endings with rename Command

Use the Linux rename command with a regex to batch change file name endings.

How to Embed a Facebook App Under Development into a Facebook Page

Step-by-step notes for embedding a Facebook app under development into a Facebook Page.

Facebook App SSL Authentication Becomes Mandatory from October 1, 2011

SSL becomes mandatory for Facebook apps and iframe Page tabs from October 1, 2011 — a summary with links.

PHP's array_key_exists Corresponds to Ruby's Hash#key?

PHP's array_key_exists maps to Ruby's Hash#key? — quick side-by-side sample of each.

[Ruby] Increment is "+=1" Not "++"

In Ruby you increment with += 1 rather than ++, briefly compared with PHP.

[Linux] How to Auto-Execute Commands or Programs at Startup

Edit /etc/rc.d/rc.local to auto-run commands at CentOS startup, such as proxy setup and ntpdate time sync.

[Eclipse] svn: Working copy locked; try performing 'cleanup' - Cannot Perform Cleanup

How I fixed an Eclipse SVN working copy locked error by deleting the log and lock files when cleanup itself failed.

[MySQL] How to Solve ERROR 1045 (28000): Access denied for user

Granting the FILE privilege to fix MySQL's Access denied error on SELECT INTO OUTFILE.

error while loading shared libraries: /lib/libc.so.6: file too short Kernel panic: Attempted to kill init!

A CentOS-on-VMware kernel panic caused by libc.so.6 that I recovered from via backup.

[Rails] How to Get View Image URLs from Within a Controller

Using view_context.image_path inside a Rails controller to resolve a full asset URL.

[Rails] The Cause of redirect_to Not Working Was a Half-Width Space in the URL

`redirect_to` failed silently in Rails because a Facebook OAuth scope URL contained a stray half-width space.

[MacOS] Steps to Install PostgreSQL with Homebrew

Installing PostgreSQL on macOS via Homebrew — initdb, launchd auto-start, PGDATA, and a non-superuser account.

How to Change the Root Route from routes.rb in Rails 3

Change the Rails 3 root route with the root directive and delete public/index.html.

[Rails] Solving the 'rake aborted! no such file to load -- pg' Error with rake db:migrate Command

Fix `rake db:migrate` failing with `no such file to load -- pg` by swapping sqlite3 for pg in your Gemfile.

To Install with Version Specification Using gem install, Add the --version= Option

Use `gem install <name> --version=X.Y.Z` to install a specific gem version instead of the latest.

[Facebook] Language Code and Country Code (locale) List

A reference table of language and country codes usable with the locale parameter in Facebook's APIs.

[Mac] Installing Ruby and Rails with RVM

How to install Ruby and Rails on Mac with RVM, pulling in dependencies through Homebrew.

[MySQL] Query Log File Cannot Be Specified Error / [ERROR] Could not use /var/log/myquery.log for logging (error 13)

Resolving MySQL's 'Could not use ... for logging (error 13)' startup failure via my.cnf.

[MySQL] Startup Fails with default-character-set

Fixing a MySQL 5.5 startup failure by switching my.cnf to character-set-server=utf8.

[PHP] Lime Testing Environment Configuration Method

How to grab lime.php and useful reference links for using symfony's Lime testing library.

[MySQL] User Deletion Should Be Done with DROP USER, Not DELETE Statement

Why user deletion in MySQL must use DROP USER, not a DELETE statement.

wget no-check-certificate Option for SSL, https Connection

Bypass wget's SSL certificate verification error with the `--no-check-certificate` option.

Nginx Installation Steps and Methods

Installing Nginx on CentOS with yum, from dependencies to auto-start configuration.

[Linux] # yum -y install yum-fastestmirror for Automatic Fast Repository Selection

Installing the yum-fastestmirror plugin on CentOS so yum automatically picks the fastest mirror.