Agile Web Development with Rails (Bata 10.0 2010.10.29) by Sam Ruby, Dave Thomas, David Heinemeier Hansson

By Sam Ruby, Dave Thomas, David Heinemeier Hansson

Ruby on Rails is helping you produce fine quality, beautiful-looking net functions speedy. you think about growing the applying, and Rails looks after the main points. Tens of hundreds of thousands of builders have used this award-winning booklet to profit Rails. it is a large, far-reaching educational and reference that is urged through the Rails center crew. in case 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 excellent, insider info you would like. Rails has advanced through the years, and this e-book has developed besides it. We nonetheless commence with a step by step walkthrough of creating a true software, and in-depth chapters examine the integrated Rails positive factors. This version now offers new Ruby and Rails clients additional info at the Ruby language and takes extra time to give an explanation for key thoughts all through. top practices on the right way to follow Rails proceed to alter, and this variation retains up. Examples use cookie subsidized periods, HTTP authentication, and energetic Record-based kinds, and the ebook 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 vast useful and function advancements.

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Even applications that normally use unstructured text, such as weblogs and news sites, often use databases as their backend 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. Although this is good from a conceptual point of view, it makes it difficult to combine relational databases with object-oriented (OO) programming languages. Objects are all about data and operations, and databases are all about sets of values.

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. Ruby comments start with a # character and run to the end of the line. Indentation is not significant (but two-character indentation is the de facto Ruby standard).

In general, though, we probably want to do something slightly different. We’ll move the determination of the time to be displayed into the controller and leave the view with the simple job of displaying it. 0 printing, October 28, 2010) H ELLO , R AILS ! 45

It is now <%= @time %>

When we refresh our browser window, we will again see the current time, showing that the communication between the controller and the view was successful. Why did we go to the extra trouble of setting the time to be displayed in the controller and then using it in the view?

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