By Mike Clark

ISBN-10: 0978739221

ISBN-13: 9780978739225

From the writer of the critical Rails Recipes , and with the aid of a brand new grasp Rails chef within the kitchen, listed here are seventy two new how one can kick your Ruby on Rails apps up a notch. extra Rails Recipes is a set of sensible recipes for dressing up your net program with little fuss. you are going to find out how the professionals have solved the cruel difficulties utilizing the main state-of-the-art Rails recommendations so that you can convey your gorgeous net app faster and more straightforward.

builders via the hundreds of thousands are coming to Rails-the advantages are transparent, either to members and their corporations.

yet how can a developer be anticipated to jot down idiomatic, potent Rails code while the know-how is so new? the answer's to paintings along masters, humans who have been there from the beginning (and who've the scars to turn out it). And, what greater option to examine from their event than to examine their code and skim their causes of why it truly is written that method? or even higher think if that code should be lifted and put correct into your individual program.

this is often higher than simply cut-and-paste: the recipe layout ability you will comprehend the code, and have the ability to regulate it to fit your wishes. And the record of recipes is so vast that you are absolute to locate counsel and strategies the place you will say "Oh! that is how they do that," or, "I did not understand you'll do this in Rails."

With extra Rails Recipes , a following as much as the preferred unique Rails Recipes , you could prepare dinner up a storm.

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It also leads to better code organization. If we ever decide to write more validation methods, we can simply add them to the CustomValidations module, and they’ll be available in all Active Record models. 52 9. W RITE C USTOM VALIDATIONS Now it’s time to put our nifty new validations to use. rb class Teacher < ActiveRecord::Base validates_presence_of :name validates_ssn :ssn end Finally, we’ll test all this. We can sidestep the database completely by just calling valid? and optionally checking the errors collection.

44 7. C ATCH A LL 404 S Discussion You could also use the catchall route to actually handle requests that don’t map to a specific action. Say, for example, you have a database table that stores “pages”: a URL path and the content to display when that URL is accessed. You might even be calling this a content management system (CMS). body else # treat it as a 404 end end 45 Part II Database Recipes 46 Recipe 8 Add Foreign Key Constraints Problem You want to add foreign key constraints to your database to, you know, ensure referential integrity.

Length %> <% end -%> Version=2 The naming here is important. The format we’re sending back is PLS, and we’re using the ERb templating system to render the format. erb. It’s rendered only if the PLS format is requested. Now a user can queue up both files we’ve added to our application in a playlist. pls Adding custom formats like this lets you easily reuse controller actions (and in turn business logic) to render results in a variety of ways. It also cleans up URLs and provides user-friendly pathways into your application.

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Advanced Rails Recipes by Mike Clark


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