yesod-dsl-0.1.1.24: codegen/entity-class-instance-field-class.cg
class ~{entityName e}~{upperFirst fn}Field e where
~{lowerFirst $ entityName e}~{upperFirst fn}Field :: SqlExpr (Database.Esqueleto.Value (Maybe (Key e))) -> EntityField ~{entityName e} (Maybe (Key e))
~{concatMap fieldInstance fs}