Download e-book for iPad: Advanced Rails Recipes by Mike Clark

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 suite of useful recipes for dressing up your internet program with little fuss. you will learn the way the professionals have solved the cruel difficulties utilizing the main state-of-the-art Rails suggestions so that you can carry your lovely internet app swifter and more uncomplicated.

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

yet how can a developer be anticipated to put in writing idiomatic, powerful Rails code whilst the expertise 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 higher option to examine from their event than to examine their code and browse their motives of why it is written that method? or even larger think if that code should be lifted and positioned correct into your individual program.

this is often greater than simply cut-and-paste: the recipe structure capacity you are going to comprehend the code, and be capable to adjust it to fit your wishes. And the record of recipes is so vast that you are sure to locate suggestions and methods 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 cook dinner up a storm.

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We can sidestep the database completely by just calling valid? and optionally checking the errors collection. valid? valid? errors[:ssn] end end Encapsulating validations like this leads to far more readable model classes, not to mention that warm feeling you get when you realize your code is DRY. net/) Thanks to Rick for technical help with this recipe. Problem Scalability is one of those fighting words. ) On a practical note, you have a number of knobs to turn and levers to pull to help your application scale.

However, we can turn around and delete the a_tshirt record from the database, leaving the line item holding a nil product. That’s no good—let’s fix it! Databases are smart about keeping invariants like this in check. Unfortunately, Rails migrations don’t support adding foreign key constraints out of the box, but we can make it look as though they do. rb module MigrationHelpers def fk(from_table, from_column, to_table) execute %(alter table #{from_table} add constraint #{constraint_name(from_table, from_column)} foreign key (#{from_column}) references #{to_table}(id)) end def drop_fk(from_table, from_column) execute %(alter table #{from_table} drop foreign key #{constraint_name(from_table, from_column)}) end def constraint_name(table, column) "fk_#{table}_#{column}" end end This looks heavy because we’re using raw SQL, but don’t let it throw you.

If we find a matching user, we’re good to go. Otherwise, we send a request back to the client to retry using the request_http_basic_authentication method. Whew! That involved quite a few steps, but we worked through it incrementally. In the end, it’s probably similar to the authentication you may already be doing in your app. The key to supporting RESTful clients is the concise login_required method with a respond_to block, which is fairly straightforward and reusable across applications. 37 5.

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Advanced Rails Recipes by Mike Clark

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