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Extra info for Agile Web Development with Rails (Bata 10.0 2010.10.29)
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?