Download PDF by Sam Ruby, Dave Thomas, David Heinemeier Hansson: Agile Web Development with Rails (Bata 10.0 2010.10.29)

By Sam Ruby, Dave Thomas, David Heinemeier Hansson

Ruby on Rails is helping you produce high quality, beautiful-looking internet purposes speedy. you consider developing the applying, and Rails looks after the main points. Tens of millions of builders have used this award-winning ebook to benefit Rails. it is a extensive, far-reaching educational and reference that is prompt through the Rails middle group. in case you are new to Rails, you will get step by step counsel. in case you are an skilled developer, this booklet provide you with the great, insider details you would like. Rails has advanced through the years, and this publication has advanced in addition to it. We nonetheless begin with a step by step walkthrough of creating a true program, and in-depth chapters examine the integrated Rails positive aspects. This version now supplies new Ruby and Rails clients additional information at the Ruby language and takes extra time to provide an explanation for key ideas all through. top practices on the way to follow Rails proceed to alter, and this variation retains up. Examples use cookie sponsored periods, HTTP authentication, and energetic Record-based kinds, and the booklet focuses all through at the correct strategy to use Rails. also, this variation now displays Ruby 1.9, a brand new unlock of Ruby with large useful and function advancements.

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1 Models, Views, and Controllers Back in 1979, Trygve Reenskaug came up with a new architecture for developing interactive applications. In his design, applications were broken into three types of components: models, views, and controllers. The model is responsible for maintaining the state of the application. Sometimes this state is transient, lasting for just a couple of interactions with the user. Sometimes the state is permanent and will be stored outside the application, often in a database.

This is implemented as a class method that returns the corresponding Order object. amount end Finally, the objects corresponding to individual rows in a table have methods that operate on that row. save end So, an ORM layer maps tables to classes, rows to objects, and columns to attributes of those objects. Class methods are used to perform table-level operations, and instance methods perform operations on the individual rows. In a typical ORM library, you supply configuration data to specify the mappings between entities in the database and entities in the program.

With Ruby, however, much of this support just isn’t necessary. Editors such as TextMate give you 90 percent of what you’d get from an IDE but are far lighter weight. Just about the only useful IDE facility that’s missing is refactoring support. for and edit previous commands, and how to complete the names of files and commands as you type. So-called tab completion is standard on Unix shells such as Bash and zsh. It allows you to type the first few characters of a filename, hit Tab , and have the shell look for and complete the name based on matching files.

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