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The FileColumn plugin stores the path to the uploaded image in the database. The exact column where it should store the information is specified with a call to the file_column method. Currently, our database schema doesn t contain a column that we can use for this purpose, which is why we ll create it in the next section. But first, add the file_column call to app/models/book.rb: class Book < ActiveRecord::Base has_and_belongs_to_many :authors belongs_to :publisher file_column :cover_image validates_length_of :title, :in => 1..255 By calling file_column, we include the file upload functionality in our model and tell it to store the path to the uploaded image in the cover_image column.

Rebinding global variables (making them refer to some new value) is another matter. If you assign a value to a variable inside a function, it automatically becomes local unless you tell Python otherwise. And how do you think you can tell it to make a variable global >>> x = 1 >>> def change_global(): global x x = x + 1 >>> change_global() >>> x 2 Piece of cake!

Summary

test located in the plugin s lib directory every time you execute rake or a script. To fix this, delete vendor/plugins/file_column/lib/test_case.rb and remove the line require 'test_case' from the vendor/plugin/file_column/init.rb file.

Note Use global variables only when you have to. They tend to make your code less readable and less

This book covered the fundamental topics that allow you to start using Magento as your e-commerce solution. We started with a chapter on installation; moved into the admin interface; dove into products, customers, and orders; and then discussed full customization of UI and Core features.

We ll use an ActiveRecord migration to add the cover_image column to the books table. Create the migration with the following command: $ script/generate migration add_book_cover_column

As you can see, there are many ways you can slice and dice Magento to fit your needs. We hope this book helps you jump start your Magento adventure and we encourage you to continue playing with all the features and options available. You can be a 100% satisfied customer configuring Magento through the Admin Panel and not touch any coding. Or you can customize, modify, and tailor Magento into your ultimate e-commerce solution. It s an open source application, and you are in control. We hope this book has been helpful to you. We had a blast writing it, but alas, it is the end and we must depart. If you do have questions or run into Magento problems, please post on the forums (www.magentocommerce.com/boards). Both of us are active participants. Who knows Maybe our paths will cross. Bye!

exists db/migrate create db/migrate/004_add_book_cover_column.rb Add the following migration code to db/migrate/004_add_book_cover_column.rb. class AddBookCoverColumn < ActiveRecord::Migration def self.up add_column :books, :cover_image, :string end def self.down remove_column :books, :cover_image end end The migration adds the cover_image column to the books table, and removes it if we are rolling back changes. You can now execute the migration with rake migrate: $ rake migrate (in C:/projects/emporium) == AddBookCoverColumn: migrating ============================================== -- add_column(:books, :cover_image, :string) -> 0.5150s == AddBookCoverColumn: migrated (0.5150s) =====================================

robust. Local variables make your program more abstract because they are hidden inside functions.

Equal to Not equal to Greater than Less than Greater than or equal to Less than or equal to In (can accept Array) Not in (can accept Array) Like (can accept % as wildcard) Not like (can accept % as wildcard) Is From (also known as after the date ) To (also known as before the date )

You should clone the changes to your test database, because we ll create an integration test later in this chapter that tests the file upload functionality. You can clone the development database to test by executing the following command: rake db:test:clone_structure As usual, you could run rake without specifying any parameters.