By Sam Ruby

ISBN-10: 1934356549

ISBN-13: 9781934356548

Ruby on Rails is helping you produce top of the range, beautiful-looking internet purposes quick. you think about growing the appliance, and Rails looks after the main points. Tens of millions of builders have used this award-winning publication to benefit Rails. it is a extensive, far-reaching educational and reference that is urged by way of the Rails middle staff. if you are new to Rails, you will get step by step suggestions. in case you are an skilled developer, this e-book provides you with the great, insider details you wish. Rails has advanced through the years, and this ebook has developed besides it. We nonetheless commence with a step by step walkthrough of establishing a true software, and in-depth chapters examine the integrated Rails positive factors. This variation now offers 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 tips to observe Rails proceed to alter, and this variation retains up. Examples use cookie sponsored classes, HTTP authentication, and lively Record-based varieties, and the booklet focuses all through at the correct technique to use Rails. also, this version now displays Ruby 1.9, a brand new liberate of Ruby with monstrous useful and function advancements.

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Extra resources for Agile Web Development with Rails (Pragmatic Programmers)

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However, content between <%= and %> is interpreted as Ruby code and executed. The result of that execution is converted into a string, and that value is substituted in the file in place of the <%=…%> sequence. now %> ➤

report erratum • discuss 22 • Chapter 2. Instant Gratification 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.

Ruby array indices start at zero. 14 ] a[0] a[2] = nil # # # # array with three elements access the first element (1) set the third element array now [ 1, 'cat', nil ] report erratum • discuss Data Types • 41 You may have noticed that we used the special value nil in this example. ” In Ruby, that’s not the case; nil is an object, just like any other, that happens to represent nothing. The method <<() is commonly used with arrays. It appends a value to its receiver. age end Ruby has a shortcut for creating an array of words: a = [ 'ant', 'bee', 'cat', 'dog', 'elk' ] # this is the same: a = %w{ ant bee cat dog elk } Ruby hashes are similar to arrays.

In this case, it finds the current user’s shopping cart (which is an object managed by the model). It also asks the model to find the information for product 2. It then tells the shopping cart to add that product to itself. (See how the model is being used to keep report erratum • discuss 32 • Chapter 3. The Architecture of Rails Applications track of all the business data? ) Now that the cart includes the new product, we can show it to the user. The controller invokes the view code, but before it does, it arranges things so that the view has access to the cart object from the model.

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Agile Web Development with Rails (Pragmatic Programmers) by Sam Ruby

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