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This is the default route that s present within all new Rails applications. It simply defines URLs as being of the format controller_name/action_name/id, as we looked at earlier. Notice that symbols :controller, :action, and :id are used, and how these relate to the data in the params hash. You can use this technique yourself when creating your own routes so that different sections of the URL are passed to your controller through params using certain element keys. Let s say that you want to create a route that means requests directly to http:// localhost/ will be passed through to your entries controller s view_all method. You can write it like so:

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map.connect '', :controller => 'entries', :action => 'view_all'

You ll nd that BBP is both simple and hard It s simple because at many levels, it s doing the obvious like telling a story, getting to the point, or being more visual And the basic work you do is to ll in the blanks of a Word document, create a PowerPoint le from the document, and then add graphics to the slides But at many levels, BBP is hard too BBP is not a quick x or a patch that you can put over your current approach to PowerPoint Learning BBP will take you through a sometimes challenging process of letting go of long-standing assumptions, habits, and practices Especially if you have been using PowerPoint for years, BBP represents a fundamental shift in thinking and action.

This route defines that if there s nothing in the URL (that is, nothing supplied after the hostname, in the path of the URL), to apply the entries controller name and view_all action name to the request automatically, thus passing it to the correct place.

All elements in a sequence are numbered from zero and upwards. You can access them individually with a number, like this: >>> greeting = 'Hello' >>> greeting[0] 'H'

Note Your new route must be located on a line above the default route of map.connect ': controller/:action/:id' so that your new route takes precedence. Routes are processed in order of precedence from the top of routes.rb downwards.

You won t learn BBP in ve minutes or an hour, but you will learn it over the course of a day, two days, a week, or a month as you read this book at your own pace and apply the process to your own presentations Although there is a steep learning curve at the beginning, be assured that the process will get faster Over time, with knowledge and practice of the techniques and tools in this book, you ll be producing BBP presentations quickly and building an ever-growing library of resources that you can reuse later If you work for yourself or by yourself, you have no choice but to apply BBP on your own, and you ll do just ne But you ll get the most out of BBP if you unlock the bene ts it produces for teams.

Make sure to delete the index.html file from public before trying to use your new route. Otherwise, http://localhost/ results in public/index.html being rendered instead, as files in public that match the requested URL have precedence over the Rails application. However, once this file is gone, routing will do its job and pass a request to http://localhost/ through to your view_all action. Routing gets a lot more advanced than this, but the techniques used vary wildly depending on what you want to do. There s a lengthy guide to how routing works and how to create your own advanced routes at http://manuals.rubyonrails.com/read/chapter/65.

So far your application only has a single model, Entry, that relates to diary entries. However, one major benefit the ActiveRecord library provides is the ability to relate models easily to one another. For example, you could create another model called User that relates to different people who can post diary entries within your system. The full depth of ActiveRecord and model relationships (also known as associations) can, and does, take up entire books, so is beyond the scope of this introduction, but in this section we ll look at a basic example of how ActiveRecord models can relate to one another. In earlier sections of this chapter you saw how ActiveRecord objects work at a basic level. For example: