Refactor migrations_path command option to database #34021
As discussed in #33994, refactors
…ors [ci skip] `migrations_paths` option was added to migration generator, with changelog entry, in rails#33760. Also `migrations_paths` option was added to model generator, with changelog entry, in rails#33994. Then `migrations_paths` was renamed to `database` and aliased as `db` in rails#34021, and was added new changelog entry. I think we should edit existed changelog entries instead adding new about changing the name of the option from `migrations_paths` to `database` since Rails 6.0 hasn't been released yet, and since It might confuse readers of the changelog file in case if they've read changelog enty about adding `migrations_paths` option but haven't read the entry about change the name of that option to `database`. @eileencodes, @gmcgibbon, @rafaelfranca Does it make sense?
Thor automatically adds `-` if aliases do not start with `-`. https://github.com/erikhuda/thor/blob/0879c1773d188902d54f95174f33961ac33111f8/lib/thor/parser/options.rb#L53 But Thor follows a convention of one-dash-one-letter options. So, even if `-` is added to `db`, it does not work. https://github.com/erikhuda/thor/blob/0879c1773d188902d54f95174f33961ac33111f8/lib/thor/parser/options.rb#L4 Follow up rails#34021.