Download Advanced Rails Recipes by Mike Clark PDF

By Mike Clark

From the writer of the critical Rails Recipes , and with assistance from a brand new grasp Rails chef within the kitchen, listed below are seventy two new how you can kick your Ruby on Rails apps up a notch. extra Rails Recipes is a suite of sensible recipes for dressing up your internet software with little fuss. you will find out how the professionals have solved the cruel difficulties utilizing the main state of the art Rails thoughts so that you can convey your lovely internet app speedier and more uncomplicated.

builders by way of the hundreds of thousands are coming to Rails-the merits are transparent, either to members and their agencies.

yet how can a developer be anticipated to write down idiomatic, powerful Rails code whilst 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 end up it). And, what larger option to examine from their adventure than to examine their code and browse their reasons of why it really is written that method? or even greater think if that code should be lifted and positioned correct into your individual software.

this is often larger than simply cut-and-paste: the recipe structure capability you are going to comprehend the code, and be capable of regulate it to fit your wishes. And the record of recipes is so huge that you are certain to locate information and strategies the place you are going to say "Oh! that is how they do that," or, "I did not recognize you may 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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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. One naive approach to improving scalability is to throw more Mongrel processes into the mix.

Lots of people listen for shouts from their friends, so we want reading shout records to go through the slave database. Once we’ve configured replication at the database server level,1 the masochism plug-in lets us seamlessly take advantage of the master/ Because database replication is very specific to your database, it’s beyond the scope of this recipe. See Deploying Rails Applications [ZT08] for how to configure MySQL master/slave replication. 1. 10. T AKE A DVANTAGE OF M ASTER /S LAVE D ATABASES slave database arrangement.

He is a speaker, agile evangelist, and Mac addict. He coorganizes the Ruby Meetup in his hometown of Raleigh, North Carolina. Problem You need to write application-specific model validations and share them across models. Solution Rails gives us a basic set of model validations right out of the box. Say we have a Student model that validates the presence of a name and the format of the Social Security number is ###-##-#### (where each number sign is a number). The Student model looks like this: class Student < ActiveRecord::Base validates_presence_of :name validates_format_of :ssn, :with => /^[\d]{3}-[\d]{2}-[\d]{4}$/, :message => "must be of format ###-##-####" end Now imagine we add a new Teacher model and teachers also need to have valid Social Security numbers (SSNs).

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