By Dave Thomas
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Additional info for Agile Web Development with Rails: A Pragmatic Guide
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Lift off! There’s one last ERb feature. %> contain less-than and ampersand characters that are significant to HTML. To prevent these from messing up your page (and, as we’ll see in Chapter 26, Securing Your Rails Application, on page 600, to avoid potential security problems), you’ll want to escape these characters. Rails has a helper method, h, that does this. Most of the time, you’re going to want to use it when substituting values into HTML pages. email>" ) %> In this example, the h method prevents the special characters in the e-mail address from garbling the browser display—they’ll be escaped as HTML entities.
At this point, we have a new application running, but it has none of our code in it. Let’s rectify this situation. 2 Hello, Rails! I can’t help it—I just have to write a Hello, World! program to try a new system. The equivalent in Rails would be an application that sends our cheery greeting to a browser. As we saw in Chapter 2, The Architecture of Rails Applications, on page 22, Rails is a Model-View-Controller framework. Rails accepts incoming requests from a browser, decodes the request to find a controller, and calls an action method in that controller.
Rhtml would point the other way. ...
... This approach would certainly work, but it’s a bit fragile. If we were to move our application to a different place on the web server, the URLs would no longer be valid. It also encodes assumptions about the Rails URL format into our code; it’s possible a future version of Rails might change this. Fortunately, these aren’t risks we have to take. Rails comes with a bunch of helper methods that can be used in view templates.