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In this chapter, we ll show you how to use a built-in Rails feature called scaffolding to jumpstart the implementation of the publisher administration and book administration user interfaces. You can use scaffolding to generate a complete CRUD implementation for objects stored in a database. Scaffolding can generate code for all three MVC layers: the model, view, and controller. Scaffolding comes in two flavors: Static scaffolding creates the code physically on disk. Static scaffolding is suited for generating boilerplate code, which you can modify later to fit your requirements. Dynamic scaffolding creates the code in memory only. It does the same as static scaffolding but at runtime, and no files are generated. This is suited only for simple functionality, such as an interface used only by administrators for editing a list of options shown to users. The scaffolding script accepts a set of parameters that tells it what to generate. You can specify the model, view, controller, and actions as parameters to the scaffold script: script/generate scaffold ModelName ControllerName action1 action2 When invoked, the scaffolding script connects to the database and inspects the table structure for the specified model. It then creates the controller, actions, and views necessary for creating, viewing, editing, and deleting the model you specified. Dynamic scaffolding is done by adding a call to the scaffold method to a controller: class JebusController < ActionController::Base scaffold :jebus end

1. Create people table 2. Add a person 3. Look for a person 4. Quit 2 Enter name: Fred Bloggs Enter job: Manager Enter gender: Male Enter age: 48 Please select an option: 1. Create people table 2. Add a person 3. Look for a person 4. Quit 3 Enter name or ID of person to find: 1 Name: Fred Bloggs Job: Manager Gender: Male Age: 48 Please select an option: 1. Create people table 2. Add a person 3. Look for a person 4. Quit 3 Enter name or ID of person to find: Jane Smith No result

def act = loop { service match { case (pf, false) => react(pf) case (pf, true) => reactWithin(500)(pf) } }

Your quick and basic application provides a way to add data and retrieve data from a remote data source in only a handful of lines!

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In the previous section we looked at SQL and how to use it with the SQLite library, a library that provides a basic database system on the local machine. More commonly, however, you might want to connect to more mainstream database servers, such as those running on MySQL, PostgreSQL, MS SQL Server, or Oracle. In this section we ll look quickly at how to connect to each of these types of databases.

this.start }

Scaffolding can t generate code that fits your requirements perfectly, so we ll also show you how to modify and extend the generated code.

Note A library called DBI is available that provides a database-agnostic interface between Ruby and

database systems. In theory you can write a program that talks with any database, and easily switch between different types of databases as long as you use DBI. In practice this isn t always possible, but learning how to use DBI can give you access to using MySQL, PostgreSQL, and Oracle in the future. Links to a number of resources about DBI are supplied in Appendix C.

We ve defined a transactional Actor. Let s see how it works. Let s create accounts for two people, dpp and archer, and put funds into the checking and savings accounts.

MySQL is the most common database system available from Web hosting providers. This is because MySQL comes in an open source variety that s free to download and use. MySQL also has a reputation as being simple to use, and a large ecosystem has built up around it. MySQL support is given to Ruby with the MySQL library that s available as a RubyGem in generic Unix and Windows varieties. To install, use this code:

Tip Scaffolding provides examples of Rails best practices and coding conventions. It s a good idea to have

val dpp = new Acct dpp ! Update("Savings", v => (v getOrElse 0) + 1000) dpp ! Update("Checking", v => (v getOrElse 0) + 100) val archer = new Acct archer ! Update("Savings", v => (v getOrElse 0) + 2000) archer ! Update("Checking", v => (v getOrElse 0) + 50) println("Initial balances:") println("dpp: "+(dpp ! GetInfo)) println("archer: "+(archer ! GetInfo))

Note On OS X, installing the mysql gem can be easier said than done. A number of problems can arise,

as covered at http://www.caboo.se/articles/2005/08/04/installing-ruby-mysql-bindings2-6-on-tiger-troubleshooting and http://bugs.mysql.com/bug.php id=23201. If at first you don t succeed, look around the Web, as there s always a solution!

Let s see what s printed on the console:

The mysql gem provides a class and a number of methods to Ruby so that you can connect to a preinstalled MySQL server. It does not include the MySQL server itself! If you don t have a MySQL server to connect to, you ll need to ask for details from your Web hosting provider or install a version of MySQL on your local machine.