Usually what I do is get the migration done, get the models built, and
then open up Console and enter some records that way. (I don’t include
validations in the models at this point but I do make the model
associations). That way I can create users, their addresses, their
tasks, etc… and know that I have data that will relate. Then I just
use the below plugin to dump it out.
not quite like what you’re looking for but I hope it helps.