Description:

        This generator compares your existing schema against the
        schema declared inside your fields declarations in your
        models.

        If the generator finds differences, it will display the
        migration it has created, and ask you if you wish to
        [g]enerate migration, generate and [m]igrate now or [c]ancel?
        Enter "g" to just generate the migration but do not run it.
        Enter "m" to generate the migration and run it, or press "c"
        to do nothing.

        The generator will then prompt you for the generator name,
        supplying a numbered default name.

        The generator is conservative and will prompt you to resolve
        any ambiguities.

Examples:

        $ ./script/generate hobo_migration

        ---------- Up Migration ----------
        create_table :foos do |t|
          t.datetime :created_at
          t.datetime :updated_at
        end
        ----------------------------------

        ---------- Down Migration --------
        drop_table :foos
        ----------------------------------
        What now: [g]enerate migration, generate and [m]igrate now or [c]ancel? m

        Migration filename:
        (you can type spaces instead of '_' -- every little helps)
        Filename [hobo_migration_2]: create_foo
              exists  db/migrate
              create  db/migrate/20091023183838_create_foo.rb
        (in /work/foo)
        ==  CreateFoo: migrating ======================================================
        -- create_table(:yos)
           -> 0.0856s
        ==  CreateFoo: migrated (0.0858s) =============================================