That may be true, but it certainly helped that he DID pay his workers enough for them to be able to afford the cars they were making.
So the easy solution is just to pay a lot and threaten to fire (and possibly blacklist) anyone who no-shows. Since the pay is much higher than they can get elsewhere, the people are much more likely to show up.
The high pay probably also helped find people who would tolerate the extremely intrusive practices of Ford's "morality police" (my term), who would inspect worker's homes to ensure they were living "the right way".