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Description:
Stubs out a new database migration. Pass the migration name, either
CamelCased or under_scored, as an argument. A migration class is generated
in db/migrate prefixed by the latest migration number.
You can name your migration in either of these formats to generate add/remove
column lines: AddColumnToTable or RemoveColumnFromTable
Example:
`./script/generate migration AddSslFlag`
With 4 existing migrations, this creates the AddSslFlag migration in
db/migrate/005_add_ssl_flag.rb
`./script/generate migration AddSslFlagToAccount`
This will create the AddSslFlagToAccount in db/migrate/005_add_ssl_flag_to_account.rb with
this in the Up migration:
add_column :accounts, :ssl_flag, :type, :null => :no?, :default => :maybe?
And this in the Down migration:
remove_column :accounts, :ssl_flag
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