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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 internet framework that allows you to create full-featured, refined web-based purposes, yet with a twist... an entire Rails program most likely has much less overall code than the XML you would have to configure an analogous software in different frameworks. With this e-book you are going to tips on how to use "ActiveRecord" to attach company items and database tables. not more painful object-relational mapping. simply create your corporation items and enable Rails do the remainder. you are going to find out how to use the "Action Pack" framework to direction incoming requests and render pages utilizing easy-to-write templates and elements. See how you can make the most the Rails provider frameworks to ship emails, enforce internet prone, and create dynamic, user-centric web-pages utilizing integrated Javascript and Ajax help. There are huge chapters on trying out, deployment, and scaling. you will see how effortless it truly is to put in Rails utilizing your internet server of selection (such as Apache or lighttpd) or utilizing its personal integrated internet server. you will be writing purposes that paintings together with your favourite database (MySQL, Oracle, Postgres, and extra) very quickly in any respect. you are going to create a whole on-line shop program within the prolonged educational part, so you will see how an entire Rails program is developed---iteratively and speedily. Rails strives to honor the Pragmatic Programmer's "DRY precept" by way of fending off the additional paintings of configuration documents and code annotations. you could enhance in real-time: make a transformation, and watch it paintings instantly. overlook XML. every thing in Rails, from templates to regulate circulate to enterprise good judgment, is written in Ruby, the language of selection for programmers who wish to get the activity performed good (and depart paintings ontime for a change). Rails is the framework of selection for the hot new release of internet 2.0 builders. Agile net improvement with Rails is the ebook for that iteration, written by means of Dave Thomas (Pragmatic Programmer and writer of Programming Ruby) and David Heinemeier Hansson, who created Rails.

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Def hello # code for hello action... 3: Rails Routes to Controllers and Actions Now let’s try calling it. Find a browser window, and navigate to the URL http://localhost:3000/say/hello. ) You’ll see something that looks like the following. It might be annoying, but the error is perfectly reasonable (apart from the weird path). We created the controller class and the action method, but we haven’t told Rails what to display. And that’s where the views come in. Remember when we ran the script to create the new controller?

Rb. Let’s have a look at it. File 209 defining classes → page 471 class SayController < ApplicationController end Pretty minimal, eh? SayController is an empty class that inherits from ApplicationController, so it automatically gets all the default controller behavior. Let’s spice it up. We need to add some code to have our controller handle the incoming request. What does this code have to do? For now, it’ll do nothing—we simply need an empty action method. So the next question is, what should this method be called?

You’ll just have to make minor adjustments to the DDL we use to create tables, and you’ll need to use that database’s syntax for some of the SQL we use in queries. (For example, later in the book we’ll use the MySQL now( ) function to compare a database column against the current date and time. ) The following table lists the available database adapters and gives links to their respective home pages. org/projects/sqlite-ruby There is a pure-Ruby version of the Postgres adapter available. org/projects/ruby-dbi.

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