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field called id, we didn t specify the creation of that column in our migration. This is because Rails will automatically create that field for every table, unless you explicitly tell it not to by using the :id => false option with create_table.

Listing 4-2 shows a modified version of the program from Listing 4-1, which uses the get method to access the database entries. An example run of this program follows. Notice how the added flexibility of get allows the program to give a useful response even though the user enters values we weren t prepared for: Name: Gumby Phone number (p) or address (a) batting average Gumby's batting average is not available.

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The commands in the migrations DSL mostly match the corresponding SQL statements. The following are the most commonly used commands. For complete documentation, see the Rails API documentation for migrations at http://api.rubyonrails.org/classes/ActiveRecord/ Migration.html. create_table(table_name, options): Creates a new table table_name. If it is given a block parameter (as in the CreateAuthors migration shown in the previous section), the commands inside the block will be executed inside the scope of this table. column(column_name, type, options): Creates a new column column_name of type type in the scope of enclosing create_table block. add_column(table_name, column_name, type, options): Equivalent to column, with the distinction that it is not used inside a create_table block, and thus needs the name of the table as an argument. drop_table(table_name): Drops the table table_name from the database. remove_column(table_name, column_name): Removes column column_name from table table_name.

Listing 4-2. Dictionary Method Example # A simple database using get() # Insert database (people) from Listing 4-1 here. labels = { 'phone': 'phone number', 'addr': 'address' } name = raw_input('Name: ') # Are we looking for a phone number or an address request = raw_input('Phone number (p) or address (a) ') # Use the correct key: key = request # In case the request is neither 'p' nor 'a' if request == 'p': key = 'phone' if request == 'a': key = 'addr' # Use get to provide default values: person = people.get(name, {}) label = labels.get(key, key) result = person.get(key, 'not available') print "%s's %s is %s." % (name, label, result)

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After we are finished editing the migration file, we can run the first migration, as follows: $ rake db:migrate (in /home/george/projects/emporium) == CreateAuthors: migrating =================================================== -- create_table(:authors) -> 0.1776s == CreateAuthors: migrated (0.1778s) ========================================== Rails uses the development environment by default, so our development database is now updated to match our migration file. If you want to do the migration to some database other than the development database, you can do so by specifying the RAILS_ENV environment variable before the rake command: $ RAILS_ENV=production rake db:migrate So what really happened when our migration script was run First of all, we got a new table called authors. But as this was the first migration, Rails also automatically created a table called schema_info. The table has only one field, version, and there should be only one row in that table at any given moment. The value of the row tells the current migration version of the database schema. The migration scripts use this information to determine which migrations need to be run to get everything up-to-date. Last, the migration created a file called db/schema.rb, which is in the same format as the migration files, and always describes the current state of the whole database schema. After the file was created, future migrations will automatically keep it up-to-date. Therefore, you should never edit it by hand.