I've written an in depth guide to installing Ruby on Rails on Mac OS X 10.9 Mavericks. It's here: Install Ruby on Rails Mac OS X Mavericks. It explains how to set up the Mac (with Xcode Command Tools), install Ruby with RVM (the Ruby Version Manager), and install Rails, with advice about updating important gems and setting up a professional development environment. I recommend you develop on OSX and deploy to Linux. First, Rails relies heavily on console commands. These are Unix-based. And since OSX is a sleek GUI for Unix, it's a perfect fit. These commands are just more 'comfortable'. This note assumes that Ruby on Rails has already been properly installed and the purpose is to replace the default DB engine SQLite with PostgreSQL. Install PostgreSQL As shown in the official Postgres download instructions here, there are few ways of installing PostgreSQL on Mac OS.

Important:The current version of Ruby (2.0) is not supported as a Cocoa scripting language in OS X v10.9. The remainder of the content in this document has not been reviewed for accuracy. Apple recommends Objective-C for the development of Cocoa apps.

Ruby and Python, two immensely popular object-oriented scripting languages, have been installed as part of OS X for many years now. But their relevance to software development, and especially application development, assumes even greater importance in OS X v10.5. The following sections summarize the capabilities and components of Ruby and Python and describe the bridges being developed and enhanced for OS X to support Cocoa programming and AppleScript-command processing from those scripting languages.

What Are Ruby and Python?

Ruby and Python are interpreted object-oriented scripting languages. As interpreted languages, you can change and run code immediately, without having to wait for the code to compile. Python and Ruby also have all the features one would expect to find in dynamic object-oriented programming languages, such as inheritance, encapsulation, introspection, and subclassing. The syntax of both languages is simple, compact, and consistent, and supports both regular expressions and sophisticated string manipulations. Memory management is built into both languages; garbage collectors automatically free memory occupied by unneeded objects. With both Python and Ruby you can call operating system routines directly. They offer ways to extend their native capabilities, including C-language interfaces.

Although their similarities are striking, these scripting languages do have some differences. While Python code can contain both objects and built-in types, in Ruby everything is an object. There are no primitive or built-in types, such as integers. Thus anything in Ruby code can accept messages. And you don’t have to declare variables to be of specific object types. To distinguish variables as global, local, instance, and class, Ruby uses naming conventions. Ruby also has mix-in by modules and blocks, language features absent in Python.

Beyond the similarities of languages and interpreters, Python and Ruby share other things in common. Both have extensive standard libraries of classes and modules. Both scripting languages can be used in a wide variety of software projects, including system programming (command-line utilities and daemons), user-interface design, Internet and networking tasks, database programming, component integration, and, of course, rapid prototyping. And both are the products of open-source projects supported by large and enthusiastic developer communities.

Both languages come with a basic set of command-line utilities. In addition to the interactive interpreter, irb, Ruby includes ri and rdoc (for displaying and generating documentation, respectively), erb (for interpreting files with embedded Ruby code), and testrb (for running test suites on Ruby code). In addition to the language interpreter, python, Python includes pydoc for viewing documentation and pythonw for running Python scripts that display a graphical user interface. All of these utilities are located in /usr/bin.

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The Standard Ruby Package

On OS X Ruby includes more than the language interpreter and documentation and testing utilities. A standard installation offers the following Ruby-related services, frameworks, and protocols:

RubyGems—A package manager for Ruby
rake—A make-like utility for Ruby scripts
Rails (or Ruby on Rails)—A framework for creating database-backed web applications with designs conforming to the Model-View-Controller pattern
For more information on Ruby on Rails, go to http://developer.apple.com/tools/rubyonrails.html.
Mongrel—A fast HTTP library and server used for hosting Ruby web applications
Capistrano—A framework and utility for executing commands in parallel on multiple remote machines, via SSH, primarily to expedite the deployment of web applications
Ferret—A search engine
OpenID—A service that provides OpenID identification to Ruby programs
sqlite3-ruby—A module that enables Ruby scripts to interact with a SQLite3 database
libxml-ruby—A module for reading and writing XML documents using Ruby
dnssd—Ruby interface for DNS Service Discovery (that is, Bonjour)
net-ssh and net-sftp—Pure Ruby implementations of the SSH and SFTP client protocols

The Standard Python Package

The Python modules included in the standard package for OS X are the following:

altgraph — Python graph (network) package
bdist_mpkg — Builds OS X installer packages from distutils
macholib — Mach-O header analysis and editing
modulegraph — Python module dependency analysis tool
numpy (or NumPy) — Array processing for numbers, strings, records, and objects
py2app — Creates standalone Mac apps with Python
setuptools — Downloads, builds, installs, upgrades, and uninstalls Python packages
xattr — A Python wrapper for Darwin’s extended filesystem attributes

Except for numpy and xattr, all of these modules are used by PyObjC.

On-line Resources

You can find out more about Python from the following websites:

Main Python website: http://www.python.org/
Documentation: http://docs.python.org/
Other developer resources: http://www.python.org/dev/

On-line resources for Ruby include the following websites:

Documentation, downloads, and other resources: http://www.ruby-lang.org/
Libraries: http://rubyforge.org/
why’s (poignant) guide to Ruby (http://poignantguide.net/ruby/), a whimsical, cartoon-illustrated introduction to Ruby

Bridges for Cocoa Development

Both Ruby and Python include bridges to the Objective-C runtime. Although these bridges are open-source projects, some changes have been made to the implementation and tool support on OS X v10.5 and later systems.

RubyCocoa

Because Ruby and Objective C share a common ancestor in Smalltalk, creating a bridge between them was relatively straightforward. RubyCocoa is a bridge that makes it possible for Ruby scripts to access Objective-C objects defined in frameworks and local project code. Consequently, one can do Cocoa programming in a Ruby script. RubyCocoa works by creating—automatically and upon demand—Ruby proxy objects that are bridged to Objective-C classes. It also forwards Ruby messages to the instances of these Objective-C classes. You can have a Cocoa application project that mixes Ruby and Objective-C source files. RubyCocoa supports all important features of Cocoa, such as key-value coding, key-value observing, Core Data, the document architecture, notifications, and undo management.

Note: For more information about RubyCocoa, go to rubycocoa.sourceforge.net. You can find RubyC

Ruby Rails For Mac Os X