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+----+-------------+---------------+--------+---------------+---| id | select_type | table | type | possible_keys | key +----+-------------+---------------+--------+---------------+---| 1 | SIMPLE | books | ALL | NULL | NULL | 1 | SIMPLE | authors_books | ALL | NULL | NULL | 1 | SIMPLE | authors | eq_ref | PRIMARY | PRIMARY | 1 | SIMPLE | publishers | eq_ref | PRIMARY | PRIMARY +----+-------------+---------------+--------+---------------+---4 rows in set (0.00 sec) We re mostly interested in the type column of the output. For the two first tables, books and authors_books, ALL means that a full-table scan is done, which should always be at least a bit alarming. If we wanted this query to stay fast when more data is imported in the database, we should make the query use an index for the authors_books table. We can do that easily with a migration: $ script/generate migration add_indices exists db/migrate create db/migrate/014_add_indices.rb Then edit the migration file to add needed indices: class AddIndices < ActiveRecord::Migration def self.up add_index :authors_books, :author_id add_index :authors_books, :book_id end def self.down remove_index :authors_books, :author_id remove_index :authors_books, :book_id end end We added indices for both foreign key fields. Now let s run the migration: $ rake db:migrate If we now run the EXPLAIN query again, we can see that the type of the join is now ref instead of ALL, meaning that an index is being used to perform the join: mysql> -> -> -> -> -> -> EXPLAIN SELECT COUNT(DISTINCT books.id) FROM books LEFT OUTER JOIN authors_books ON authors_books.book_id = books.id LEFT OUTER JOIN authors ON authors.id = authors_books.author_id LEFT OUTER JOIN publishers ON publishers.id = books.publisher_id;

The values method returns a list of the values in the dictionary (and itervalues returns an iterator of the values). Unlike keys, the list returned by values may contain duplicates:

permissions by visiting your Magento directory. If the page loads without errors, you can skip this step and move on to section Installation Step 4: Setting Up a Magento database.

The next step is to open the migration file in a text editor and edit it so that the database will look how we want it to look. In this case, it means adding two fields to the table skeleton: class CreateAuthors < ActiveRecord::Migration def self.up create_table :authors do |t| t.column :first_name, :string t.column :last_name, :string end end

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Using an FTP client, navigate to your Magento directory. Use the Change Permissions or Change Mode function built into your FTP client. Note that with previous command line installation often times you can click on the folder and change the permissions this way. Permissions are usually set in one of two ways, either by a number or organized by groups. If your FTP uses numbers, set the number to 777 or 0777. If your FTP client organizes permissions by groups, make sure that every group has access under Reading Writing and Execute, often times abbreviated as RWX.

def self.down drop_table :authors end end Rails migrations use a special domain-specific language (DSL) written in Ruby. This way, the migration code is database-agnostic and can be used to deploy the application to different database platforms. Every migration should implement the methods self.up and self.down, which are created automatically when a new migration is generated by running either the generate model or the explicit generate migration command. Code inside self.up is run when the database is migrated to a higher version, and the code in self.down is run when the database is migrated back to an earlier version. In our first migration, we create a new table called authors and add columns for both the first and last names of an author. In the self.down part, we drop the authors table, just in case we someday would want to go back to ground zero.

d = {} d[1] = 1 d[2] = 2 d[3] = 3 d[4] = 1 d.values() 2, 3, 1]

Note If your server has suPHP or suEXEC enabled, you will need to use permission 755 instead of 777.

Note Even though every table used by ActiveRecord (except for join tables) should have a primary key

Figure 2-2. An informational view of a folder. This allows you to easily adjust permission. If you are not using an FTP program, file permissions can also be set using a file browser from within your webhost cpanel or another administrative interface. Simply navigate to your Magento folder and adjust the permissions using the previous process detailed.