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Steve Holzner's Beginning Ruby on Rails PDF

By Steve Holzner

ISBN-10: 0470069155

ISBN-13: 9780470069158

Ruby on Rails is the innovative on-line programming device that makes growing practical e-commerce sites speedier and more uncomplicated than ever. With the intuitive, common nature of Ruby and the advance platform supplied through Rails, you could prepare full-fledged net purposes quick, whether you are new to net programming.You will discover a thorough advent 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 get to grips with Ruby's sessions and gadgets. you will learn how to construct Rails functions, hook up with databases, practice important trying out, and placed the whole lot jointly to create real-world functions akin to buying carts and on-line catalogs - apps you possibly can use correct away.What you are going to examine from this e-book* the way to set up and use Ruby and Rails* Object-oriented programming with Ruby* Rails basics and the way to create easy on-line purposes* the way to paintings with HTML controls, use versions in Rails functions, and paintings with periods* info on operating with databases and growing, enhancing, and deleting database documents* tools for dealing with cookies and filters and for caching pages* easy methods to attach Rails with AjaxWho this e-book is forThis ebook is for somebody who desires to advance on-line functions utilizing Ruby and Rails. A simple realizing of programming is beneficial; a few wisdom of HTML is necessary.Wrox starting publications are crafted to make studying programming languages and applied sciences more straightforward than you think that, delivering a established, instructional layout that might consultant you thru all of the options concerned.

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Storing Data in Variables Ruby can store your data in variables, which are named placeholders that can store numbers, strings, and other data. You reference the data stored in a variable by using the variable’s name. For example, to store a value of 34 in a variable named temperature, you assign that variable the value like this: temperature = 34 Then you refer to the data in the temperature variable by name, as here, where you are printing out the value in the temperature variable (34) in a command window: puts temperature Here’s the result: 34 Because you refer to the values in variables by using the variables’ names in code, it’s important to realize that there are rules for the names you can use in Ruby.

Rb. rb Picnic time! How It Works This code uses the unless statement to check the temperature. ” unless the temperature is less than 65 or greater than 85. Here’s the syntax of the full unless statement: unless Boolean [then | :] code ] [else code ] end You can’t use elsif in unless statements, and there is no such thing as an unlessif clause. qxp 10/23/06 8:01 PM Page 38 Chapter 2 Note that you can simply negate the condition tested in an unless statement and use the ! logical negation operator — which switches false to true and true to false — to change from unless to if.

But it’s that first letter that is crucial — it must be uppercase so that Ruby knows that you intend to create a constant. Constants are often used to collect data items that won’t change at the beginning of your code so that they can be grouped together and changed easily if need be — you use the constants throughout your code, and won’t have to hunt for the specific values the constants stand for and change them throughout your code if you need to change a value. 056” These constants, IP_SERVER_SOURCE and IP_SERVER_TARGET, can now be used throughout your code, and if you have to change them, you only need to change them in one place.

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Beginning Ruby on Rails by Steve Holzner

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