By Dave Thomas, David Heinemeier Hansson, Sam Ruby
Ruby on Rails is helping you produce high quality, beautiful-looking internet purposes speedy. you think about developing the appliance, and Rails looks after the details.
Tens of hundreds of thousands of builders have used this award-winning e-book to benefit Rails. It's a huge, far-reaching educational and reference that's suggested by way of the Rails middle crew. If you're new to Rails, you'll get step by step counsel. If you're an skilled developer, this e-book provide you with the great, insider info you need.
Rails has advanced through the years, and this ebook has advanced in addition to it. We nonetheless commence with a step by step walkthrough of establishing a true software, and in-depth chapters examine the integrated Rails good points. This version now provides new Ruby and Rails clients additional info at the Ruby language and takes extra time to give an explanation for key options all through. top practices on how you can observe Rails proceed to alter, and this variation retains up. Examples use cookie sponsored periods, HTTP authentication, and energetic Record-based types, and the e-book focuses all through at the correct option to use Rails. also, this variation now displays Ruby 1.9, a brand new free up of Ruby with mammoth sensible and function improvements.
Read or Download Agile Web Development with Rails (4th edition) PDF
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Additional resources for Agile Web Development with Rails (4th edition)
Let’s start by creating a simple application that sends our cheery greeting to a browser. After we get that working, we will embellish it with the current time and links. As we’ll explore further in Chapter 3, The Architecture of Rails Applications, on page 50, Rails is a Model-View-Controller framework. 0 printing, October 28, 2010) 39 H ELLO , R AILS ! requests from a browser, decodes the request to find a controller, and calls an action method in that controller. The controller then invokes a particular view to display the results to the user.
Class names, module names, and constants must start with an uppercase letter. By convention they use capitalization, rather than underscores, to distinguish the start of words within the name. Class names look like Object, PurchaseOrder, and LineItem. Rails uses symbols to identify things. In particular, it uses them as keys when naming method parameters and looking things up in hashes. For example: redirect_to :action => "edit", :id => params[:id] As you can see, a symbol looks like a variable name, but it’s prefixed with a colon.
You don’t need a semicolon at the end of a statement as long as you put each statement on a separate line. Ruby comments start with a # character and run to the end of the line. Indentation is not significant (but two-character indentation is the de facto Ruby standard). Ruby doesn’t use braces to delimit the bodies of compound statements and definitions (such as methods and classes). Instead, you simply finish the body with the keyword end. The keyword return is optional, and if not present, the results of the last expression evaluated will be returned.
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