Description:

Generates a migration of database schema or content.

Example:

<%= banner_command %> generate migration better_comments -m mymod

This will create:

    mod/mymod/data/transform/(migration_number)_better_comments.rb

<%= banner_command %> generate migration better_comments -m mymod --schema

This will create:

    mod/mymod/data/schema/(migration_number)_better_comments.rb