... as Taggable On. Rather than tying functionality to a specific keyword (namely tags), acts as taggable on allows you to specify an arbitrary number of tag "contexts" that can be used locally or in combination in the same way steroids was used. If you do not wish or need to support multi-tenancy, the migration for add_tenant_to_taggings is optional and can be discarded safely. You can also add and remove tags in format of String.