By Dave Thomas, David Heinemeier Hansson, Leon Breedt, Mike Clark, Thomas Fuchs, Andrea Schwarz
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Extra info for Agile web development with rails: a Pragmatic guide
Well, we could just hack. After all, a Rails application is just Ruby source code. But Rails also does a lot of magic behind the curtain to get our applications to work with a minimum of explicit configuration. To get this magic to work, Rails needs to find all the various components of your application. 2, Directory Structure, on page 173), this means that we need to create a specific directory structure, slotting the code we write into the appropriate places. The rails command simply creates this directory structure for us and populates it with some standard Rails code.
What gives? It turns out that the WEBrick-based Rails dispatcher is pretty clever. In development mode (as opposed to testing or production), it automatically reloads application source files when a new request comes along. That way, when we edit our application, the dispatcher makes sure it’s running the most recent changes. This is great for development. However, this flexibility comes at a cost—it causes a short pause after you enter a URL before the application responds. That’s caused by the dispatcher reloading stuff.
File 22 drop table if exists products; create table products ( id int title varchar(100) description text image_url varchar(200) price decimal(10,2) primary key (id) ); not not not not not Prepared exclusively for Rida Al Barazi null auto_increment, null, null, null, null, Report erratum 50 I TERATION A1: G ET S OMETHING R UNNING Our table includes the product title, description, image, and price, just as we sketched out. We’ve also added something new: a column called id. This is used to give each row in the table a unique key, allowing other tables to reference products.