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

By Sam Ruby, Dave Thomas, David Heinemeier Hansson

Ruby on Rails is helping you produce top of the range, beautiful-looking internet functions fast. you consider growing the applying, and Rails looks after the main points. Tens of hundreds of thousands of builders have used this award-winning e-book to profit Rails. it is a extensive, far-reaching instructional and reference that is advised via the Rails middle crew. in case you are new to Rails, you will get step by step information. if you are an skilled developer, this e-book offers you the great, insider details you wish. Rails has developed through the years, and this publication has developed besides 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 variation now offers new Ruby and Rails clients additional information at the Ruby language and takes extra time to give an explanation for key thoughts all through. most sensible practices on how one can follow Rails proceed to alter, and this version retains up. Examples use cookie sponsored periods, HTTP authentication, and lively Record-based types, and the ebook focuses all through at the correct method to use Rails. also, this variation now displays Ruby 1.9, a brand new unlock of Ruby with significant sensible and function advancements.

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Good question. In this application, it doesn’t make much difference, but by putting the logic in the controller instead, we buy ourselves some benefits. For example, we may want to extend our application in the future to support users in many countries. In that case, we’d want to localize the display of the time, choosing a time appropriate to their time zone. That would be a fair amount of application-level code, and it would probably not be appropriate to embed it at the view level. By setting the time to display in the controller, we make our application more flexible—we can change the time zone in the controller without having to update any view that uses that time object.

To get this magic to work, Rails needs to find all the various components of your application. 1, Where things go, on page 262), 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. To create your first Rails application, pop open a shell window, and navigate to a place in your filesystem where you want to create your application’s directory structure.

Examples of symbols include :action, :line_items, and :id. You can think of symbols as string literals that are magically made into constants. ” Now that we have used a few methods, let’s move on to how they are defined. Methods Let’s write a method that returns a cheery, personalized greeting. We’ll invoke that method a couple of times: def say_goodnight(name) result = 'Good night, ' + name return result end # Time for bed... puts say_goodnight('Mary-Ellen') puts say_goodnight('John-Boy') Having defined the method, we call it twice.

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