By Sam Ruby, Dave Thomas, David Heinemeier Hansson
Ruby on Rails is helping you produce top quality, beautiful-looking net functions fast. 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 benefit Rails. it is a extensive, far-reaching educational and reference that is suggested via the Rails middle workforce. if you are new to Rails, you will get step by step suggestions. in case you are an skilled developer, this e-book offers you the great, insider details you wish. Rails has advanced through the years, and this booklet has developed in addition to it. We nonetheless commence with a step by step walkthrough of creating a true program, and in-depth chapters examine the integrated Rails good points. This version now offers new Ruby and Rails clients additional information at the Ruby language and takes extra time to provide an explanation for key suggestions all through. top practices on the best way to follow Rails proceed to alter, and this variation retains up. Examples use cookie sponsored classes, HTTP authentication, and lively Record-based kinds, and the booklet 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 great sensible and function advancements.
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Extra resources for Agile Web Development with Rails (4th Edition - final)
For all but SQLite 3, you’ll need to install a database driver, a library that Rails can use to connect to and use your database engine. This section contains links to instructions to get that done. The database drivers are all written in C and are primarily distributed in source form. If you don’t want to bother building a driver from source, take a careful look at the driver’s website. Many times you’ll find that the author also distributes binary versions. 0 printing, March 2011) 33 W HAT W E J UST D ID If you can’t find a binary version or if you’d rather build from source anyway, you’ll need a development environment on your machine to build the library.
However, content between <%= and %> is interpreted as Ruby code and executed. %> sequence. now %>
When we refresh our browser window, we see the time displayed using Ruby’s standard format:1 Notice that if you hit Refresh in your browser, the time updates each time the page is displayed. It looks as if we’re really generating dynamic content. Adding the Time Our original problem was to display the time to users of our application. We now know how to make our application display dynamic data.
In our case, we do that using a local URL such as http://localhost:3000/say/hello. 2. Rails then matches the route pattern, which it previously split into two parts and analyzed. rb). 3. The next part of the pattern, hello, identifies an action. Rails invokes a method of that name in the controller. This action method creates a new Time object holding the current time and tucks it away in the @time instance variable. 4. Rails looks for a template to display the result. erb). 5. Rails processes this file through the ERb templating system, executing any embedded Ruby and substituting in values set up by the controller.