By Sam Ruby

Ruby on Rails is helping you produce fine quality, beautiful-looking net purposes quick. you think about developing the appliance, and Rails looks after the main points. Tens of hundreds of thousands of builders have used this award-winning booklet to profit Rails. it is a wide, far-reaching educational and reference that is prompt through the Rails middle workforce. if you are new to Rails, you will get step by step counsel. if you are an skilled developer, this e-book offers you the excellent, insider details you wish. Rails has developed through the years, and this booklet has developed besides it. We nonetheless begin with a step by step walkthrough of establishing a true program, and in-depth chapters examine the integrated Rails good points. This variation now supplies new Ruby and Rails clients additional information at the Ruby language and takes extra time to give an explanation for key ideas all through. top practices on find out how to follow Rails proceed to alter, and this variation retains up. Examples use cookie subsidized periods, HTTP authentication, and lively Record-based varieties, and the publication focuses all through at the correct solution to use Rails. also, this variation now displays Ruby 1.9, a brand new unencumber of Ruby with vast sensible and function advancements.

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Inst_section = { cello: 'string', clarinet: 'woodwind', drum: 'percussion', oboe: 'woodwind', report erratum • discuss 42 • Chapter 4. Introduction to Ruby trumpet: violin: 'brass', 'string' } Doesn’t that look much better? Feel free to use whichever syntax you like. You can even intermix usages in a single expression. 7. 2. Hashes are indexed using the same square bracket notation as arrays: inst_section[:oboe] inst_section[:cello] inst_section[:bassoon] #=> 'woodwind' #=> 'string' #=> nil As the previous example shows, a hash returns nil when indexed by a key it doesn’t contain.

3 Linking Pages Together It’s a rare web application that has just one page. ” application. Normally, each page in your application will correspond to a separate view. In our case, we’ll also use a new action method to handle the page (although that isn’t always the case, as we’ll see later in the book). We’ll use the same report erratum • discuss Linking Pages Together • 25 controller for both actions. Again, this needn’t be the case, but we have no compelling reason to use a new controller right now.

That’s all there is to an MVC web application. By following a set of conventions and partitioning your functionality appropriately, you’ll discover that your code becomes easier to work with and your application becomes easier to extend and maintain. Seems like a good trade. If MVC is simply a question of partitioning your code a particular way, you might be wondering why you need a framework such as Ruby on Rails. The answer is straightforward: Rails handles all of the low-level housekeeping for you—all those messy details that take so long to handle by yourself—and lets you concentrate on your application’s core functionality.

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