By Dave Thomas, David Heinemeier Hansson, Sam Ruby
Ruby on Rails is helping you produce top quality, beautiful-looking internet purposes fast. you consider developing the appliance, and Rails looks after the details.
Tens of hundreds of thousands of builders have used this award-winning booklet to benefit Rails. It's a wide, far-reaching instructional and reference that's steered via the Rails center workforce. If you're new to Rails, you'll get step by step counsel. If you're an skilled developer, this ebook provides you with the great, insider info you need.
Rails has advanced through the years, and this ebook has advanced besides it. We nonetheless begin with a step by step walkthrough of creating a true program, and in-depth chapters examine the integrated Rails gains. This variation now offers new Ruby and Rails clients additional info at the Ruby language and takes extra time to provide an explanation for key recommendations all through. most sensible practices on how one can follow Rails proceed to alter, and this version retains up. Examples use cookie sponsored classes, HTTP authentication, and energetic Record-based kinds, and the booklet focuses all through at the correct option to use Rails. also, this version now displays Ruby 1.9, a brand new unencumber of Ruby with titanic useful and function improvements.
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Extra info for Agile Web Development with Rails (4th edition)
The reverse is also true. 1. SQL, referred to by some as Structured Query Language, is the language used to query and update relational databases. 0 printing, October 28, 2010) 53 R AILS M ODEL S UPPOR T Over time, folks have worked out ways of reconciling the relational and OO views of their corporate data. Let’s look at the way that Rails chooses to map relational data onto objects. Object-Relational Mapping ORM libraries map database tables to classes. If a database has a table called orders, our program will have a class named Order.
Rails enforces a structure for your application—you develop models, views, and controllers as separate chunks of functionality, and it knits them all together as your program executes. 2: Rails and MVC metadata to make it all work. This is an example of the Rails philosophy of favoring convention over configuration. In a Rails application, an incoming request is first sent to a router, which works out where in the application the request should be sent and how the request itself should be parsed.
3. Making It Dynamic So far, our Rails application is pretty boring—it just displays a static page. To make it more dynamic, let’s have it show the current time each time it displays the page. To do this, we need to make a change to the template file in the view—it now needs to include the time as a string. That raises two questions. First, how do we add dynamic content to a template? Second, where do we get the time from? 0 printing, October 28, 2010) 42 H ELLO , R AILS ! Dynamic Content There are many ways of creating dynamic templates in Rails.