Save to db with no table create?

Rails
1

Is there a tool or method to persist arbitrary objects to the db without
having to do a manual table create step?

If not, and I therefore HAVE to do work just to save , then is this a
valid sequence to persist a new class ?:

  1. put create and drop table statements in a new migration (step)
  2. define a class of same name which extends ActiveRecord (table name is
    plural), optionally not writing down the variables
  3. use OBJECTCLASSNAME.find or OBJECTCLASSNAME.save records in and out
    of db