put PersistEntity constraint on right-hand side
put PersistEntity constraint on right-hand side

This should reduce the need for the user to add
the PersistEntity constraint.

It was on the left side before
890ee388cada5937c393790f84ff0950d4f4b4c1

gbwey/persistent,greydot/persistent,pseudonom/persistent,rdnetto/persistent,paul-rouse/persistent,psibi/persistent,erikd/persistent,mitchellwrosen/persistent,plow-technologies/persistent,greydot/persistent,mkscrg/persistent,mitchellwrosen/persistent,gbwey/persistent,jasonzoladz/persistent,meteficha/persistent,rdnetto/persistent,greydot/persistent,mitchellwrosen/persistent,superduper/persistent,superduper/persistent,andrewthad/persistent,meteficha/persistent,junjihashimoto/persistent,jcristovao/persistent,andrewthad/persistent,gbwey/persistent,mkscrg/persistent,junjihashimoto/persistent,mkscrg/persistent,pseudonom/persistent,naushadh/persistent,nakaji-dayo/persistent,jcristovao/persistent,andrewthad/persistent,nakaji-dayo/persistent,creichert/persistent,superduper/persistent,nakaji-dayo/persistent,jasonzoladz/persistent,jasonzoladz/persistent,jcristovao/persistent,bitemyapp/persistent,meteficha/persistent,yesodweb/persistent