By Sam Ruby
Ruby on Rails is helping you produce fine quality, beautiful-looking internet purposes fast. you think about growing the applying, and Rails looks after the main points. Tens of millions of builders have used this award-winning e-book to profit Rails. it is a vast, far-reaching instructional and reference that is urged by means of the Rails middle crew. if you are new to Rails, you will get step by step suggestions. in case you are an skilled developer, this ebook provide you with the great, insider info you would like. 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 program, and in-depth chapters examine the integrated Rails positive aspects. This variation now provides new Ruby and Rails clients additional info at the Ruby language and takes extra time to give an explanation for key innovations all through. top practices on tips to follow Rails proceed to alter, and this version retains up. Examples use cookie subsidized periods, HTTP authentication, and lively Record-based types, and the publication focuses all through at the correct technique to use Rails. also, this version now displays Ruby 1.9, a brand new unencumber of Ruby with gigantic practical and function advancements.
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Additional info for Agile Web Development with Rails (Pragmatic Programmers)
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. In both cases, we pass the result to the method puts(), which outputs to the console its argument followed by a newline (moving on to the next line of output). You don’t need a semicolon at the end of a statement as long as you put each statement on a separate line.
2 Rails Model Support In general, we’ll want our web applications to keep their information in a relational database. Order-entry systems will store orders, line items, and customer details in database tables. Even applications that normally use unstructured text, such as weblogs and news sites, often use databases as their back-end data store. Although it might not be immediately apparent from the SQL1 you use to access them, relational databases are actually designed around mathematical set theory.
In an online store, the concept of a line item could be such a category. In Ruby, you’d define a class to represent each of these categories. You then use this class as a kind of factory that generates objects—instances of that class. An object is a combination of state (for example, the quantity and the product id) and methods that use that state (perhaps a method to calculate the line item’s total cost). We’ll show how to create classes on page 46. report erratum • discuss 38 • Chapter 4. Introduction to Ruby Objects are created by calling a constructor, a special method associated with a class.