Agile web development with rails: a Pragmatic guide by Dave Thomas, David Heinemeier Hansson, Leon Breedt, Mike

By Dave Thomas, David Heinemeier Hansson, Leon Breedt, Mike Clark, Thomas Fuchs, Andrea Schwarz

Rails is a full-stack, open resource net framework that allows you to create full-featured, subtle web-based functions, yet with a twist... an entire Rails software most likely has much less overall code than the XML you'll have to configure an identical software in different frameworks. With this e-book you will the best way to use "ActiveRecord" to attach enterprise gadgets and database tables. not more painful object-relational mapping. simply create what you are promoting gadgets and allow Rails do the remainder. you will how you can use the "Action Pack" framework to direction incoming requests and render pages utilizing easy-to-write templates and parts. See the right way to make the most the Rails carrier frameworks to ship emails, enforce internet providers, and create dynamic, user-centric web-pages utilizing integrated Javascript and Ajax aid. There are broad chapters on checking out, deployment, and scaling. you will see how effortless it really is to put in Rails utilizing your internet server of selection (such as Apache or lighttpd) or utilizing its personal integrated net server. you can be writing purposes that paintings along with your favourite database (MySQL, Oracle, Postgres, and extra) very quickly in any respect. you are going to create an entire on-line shop software within the prolonged instructional part, so you will see how an entire Rails program is developed---iteratively and quickly. Rails strives to honor the Pragmatic Programmer's "DRY precept" by means of fending off the additional paintings of configuration records and code annotations. you could boost in real-time: make a metamorphosis, and watch it paintings instantly. put out of your mind XML. every little thing in Rails, from templates to manage circulate to company good judgment, is written in Ruby, the language of selection for programmers who prefer to get the task performed good (and go away paintings ontime for a change). Rails is the framework of selection for the hot new release of net 2.0 builders. Agile net improvement with Rails is the e-book for that new release, written by means of Dave Thomas (Pragmatic Programmer and writer of Programming Ruby) and David Heinemeier Hansson, who created Rails.

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Well, we could just hack. After all, a Rails application is just Ruby source code. But Rails also does a lot of magic behind the curtain to get our applications to work with a minimum of explicit configuration. To get this magic to work, Rails needs to find all the various components of your application. 2, Directory Structure, on page 173), this means that we need to create a specific directory structure, slotting the code we write into the appropriate places. The rails command simply creates this directory structure for us and populates it with some standard Rails code.

What gives? It turns out that the WEBrick-based Rails dispatcher is pretty clever. In development mode (as opposed to testing or production), it automatically reloads application source files when a new request comes along. That way, when we edit our application, the dispatcher makes sure it’s running the most recent changes. This is great for development. However, this flexibility comes at a cost—it causes a short pause after you enter a URL before the application responds. That’s caused by the dispatcher reloading stuff.

File 22 drop table if exists products; create table products ( id int title varchar(100) description text image_url varchar(200) price decimal(10,2) primary key (id) ); not not not not not Prepared exclusively for Rida Al Barazi null auto_increment, null, null, null, null, Report erratum 50 I TERATION A1: G ET S OMETHING R UNNING Our table includes the product title, description, image, and price, just as we sketched out. We’ve also added something new: a column called id. This is used to give each row in the table a unique key, allowing other tables to reference products.

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