By Sam Ruby, Dave Thomas, David Heinemeier Hansson
Ruby on Rails is helping you produce fine quality, beautiful-looking net purposes speedy. you consider developing the applying, and Rails looks after the main points. Tens of hundreds of thousands of builders have used this award-winning ebook to benefit Rails. it is a vast, far-reaching instructional and reference that is prompt via the Rails center crew. if you are new to Rails, you will get step by step counsel. if you are an skilled developer, this ebook provides you with the excellent, insider info you wish. Rails has advanced through the years, and this booklet has developed besides it. We nonetheless begin with a step by step walkthrough of creating a true software, and in-depth chapters examine the integrated Rails positive aspects. This version now offers new Ruby and Rails clients additional information at the Ruby language and takes extra time to give an explanation for key ideas all through. top practices on how you can observe Rails proceed to alter, and this version retains up. Examples use cookie subsidized classes, HTTP authentication, and energetic Record-based varieties, and the booklet focuses all through at the correct option to use Rails. also, this version now displays Ruby 1.9, a brand new free up of Ruby with big useful and function advancements.
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Additional info for Agile Web Development with Rails (4th edition) Beta 12 version
2 Data Types While everything in Ruby is an object, some of the data types in Ruby have special syntax support, in particular for defining literal values. In these examples, we’ve used some simple strings and even string concatenation. Strings This previous example also showed some Ruby string objects. One way to create a string object is to use string literals, which are sequences of characters between single or double quotation marks. The difference between the two forms is the amount of processing Ruby does on the string while constructing the literal.
Objects are all about data and operations, and databases are all about sets of values. Operations that are easy to express in relational terms are sometimes difficult to code in an OO system. The reverse is also true. 1. SQL, referred to by some as Structured Query Language, is the language used to query and update relational databases. 0 printing, January 10, 2011) 54 R AILS M ODEL S UPPOR T Over time, folks have worked out ways of reconciling the relational and OO views of their corporate data.
With other, less expressive languages, programmers rely on IDEs to do much of the grunt work for them: IDEs do code generation, assist with navigation, and compile incrementally to give early warning of errors. With Ruby, however, much of this support just isn’t necessary. Editors such as TextMate and BBEdit give you 90 percent of what you’d get from an IDE but are far lighter weight. Just about the only useful IDE facility that’s missing is refactoring support. for and edit previous commands, and how to complete the names of files and commands as you type.
Agile Web Development with Rails (4th edition) Beta 12 version by Sam Ruby, Dave Thomas, David Heinemeier Hansson