Rails 4 in Action: Revised Edition of Rails 3 in Action by Ryan Bigg
By Ryan Bigg
Rails is a full-stack, open resource net framework powered via Ruby. Now in model four, Rails is mature and strong, and to take advantage of it successfully you wish various Google searches. you can find no replacement for the guru's-eye-view of layout, checking out, deployment, and different real-world issues that this e-book presents. Rails four in motion is a hands-on advisor to the topic. during this absolutely revised new version, you will grasp Rails four by way of constructing a ticket-tracking software that comes with RESTful routing, authentication and authorization, dossier uploads, electronic mail, and extra. discover ways to layout your individual APIs and effectively set up a production-quality software. you will see test-driven improvement and behavior-driven improvement in motion through the e-book, similar to in a most sensible Rails store.
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Extra info for Rails 4 in Action: Revised Edition of Rails 3 in Action
The opposite of creating a table is to drop that table from the database. If the migration was more complex than this, you’d need to split it into two methods— one called up and one called down—that would tell Rails what to do in both cases. Rails is usually smart enough to figure out what you want to do, but sometimes it’s not clear and you’ll need to be explicit. You’ll see examples of this in later chapters. sqlite3 and then creates the purchases table inside that. When you run bundle exec rake db:migrate, it doesn’t just run the change method from the latest migration, but runs any migration that hasn’t yet been run, allowing you to run multiple migrations sequentially.
That method calls params (short for parameters), which is a method that returns the parameters sent from your form in a Hash-like object. We’ll talk more about why you need this little dance later (in chapter 3); this is a feature called strong parameters. When you pass this params hash into new, Rails sets the attributes (the Rails word for fields) to the values from the form. save. This method validates the record; and if it’s valid, the method saves the record to the database and returns true.
Rb. This is the file you’ll use to test your currently nonexistent Bacon class. rb. describe to describe the behavior of the (currently undefined) Bacon class and write an example for it, declaring that Bacon is edible. The describe block contains tests (examples) that describe the behavior of bacon. In this example, whenever you call edible? on Bacon, the result should be true. expect and to serve a purpose similar to that of assert, which is to assert that the object passed to expect matches the arguments passed to to.