By Steve Holzner
Ruby on Rails is the progressive on-line programming instrument that makes developing useful e-commerce sites swifter and more straightforward than ever. With the intuitive, uncomplicated nature of Ruby and the improvement platform supplied by means of Rails, you could prepare full-fledged internet functions quick, whether you are new to internet programming.You will discover a thorough creation to either Ruby and Rails during this ebook. you will get the straightforward directions for buying and fitting either; comprehend the character of conditionals, loops, tools, and blocks; and familiarize yourself with Ruby's sessions and gadgets. you will learn how to construct Rails functions, hook up with databases, practice valuable checking out, and placed the whole lot jointly to create real-world purposes similar to buying carts and on-line catalogs - apps you may use correct away.What you are going to examine from this ebook* how you can set up and use Ruby and Rails* Object-oriented programming with Ruby* Rails basics and the way to create simple on-line purposes* easy methods to paintings with HTML controls, use versions in Rails functions, and paintings with classes* information on operating with databases and developing, enhancing, and deleting database files* equipment for dealing with cookies and filters and for caching pages* the right way to attach Rails with AjaxWho this e-book is forThis booklet is for a person who desires to advance on-line purposes utilizing Ruby and Rails. A simple realizing of programming is useful; a few wisdom of HTML is necessary.Wrox starting courses are crafted to make studying programming languages and applied sciences more uncomplicated than you think that, delivering a dependent, educational layout that might advisor you thru the entire strategies concerned.
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Additional resources for Beginning Ruby on Rails
Using elsif Clauses in if Statements You can choose to run one of several code blocks, depending on the conditionals. That’s where Ruby’s elsif clause comes in. qxp 10/23/06 8:01 PM Page 36 Chapter 2 code to be executed if condition2 is true else code to be executed if condition1 and condition2 are not true It basically says if condition1 is true, its code runs; if it isn’t, then condition2 is checked. If condition2 is true, its code runs; if it isn’t, then the else code runs. This is the elsif clause.
Rb. rb Sorry, no picnic today. ” end Here’s what an if statement with an else clause looks like in general — note that the else clause is optional: if Boolean [then | :] code [else code ] end There’s more to if statements — you can add elsif clauses to perform more tests, and evaluate code if those tests turn out to be true. Using elsif Clauses in if Statements You can choose to run one of several code blocks, depending on the conditionals. That’s where Ruby’s elsif clause comes in. qxp 10/23/06 8:01 PM Page 36 Chapter 2 code to be executed if condition2 is true else code to be executed if condition1 and condition2 are not true It basically says if condition1 is true, its code runs; if it isn’t, then condition2 is checked.
To create a range, use the .. operator. 4 That creates the range 1, 2, 3, 4. 4 puts my_range This gives you: 1 2 3 4 You can also use the ... operator, which is the same thing except that the final item in the range is omitted. 4 puts my_new_range Here’s what you get: 1 2 3 Ranges are going to be useful in the next chapter, when you want Ruby to do something over and over again. Using a range, you can specify the data items that you want Ruby to work with in such cases. Try It Out Using Ranges To get started using ranges in Ruby, follow these steps: 1.
Beginning Ruby on Rails by Steve Holzner