Many many = field.getAnnotation(Many.class);
if (null != many) {
Mirror<?> ta = Mirror.me(many.target());
Field pkFld;
Field targetReferFld;
if (Strings.isBlank(many.field())) {
pkFld = null;
targetReferFld = null;
} else {
targetReferFld = ta.getField(many.field());
pkFld = lookupPkByReferField(mirror, targetReferFld);