<%-
import 'context'
import model.package
import 'google.golang.org/appengine/datastore'
import 'google.golang.org/appengine/log'
import 'github.com/mjibson/goon'
-%>

func (s *<%= type.name %>) Exist(ctx context.Context, m *<%= model.qualified_name %>) (bool, error) {
	if m.ID == 0 {
		return false, nil
	}
	g := goon.FromContext(ctx)
	key, err := g.KeyError(m)
	if err != nil {
		log.Errorf(ctx, "Failed to Get Key of %v because of %v\n", m, err)
		return false, err
	}
	_, err = s.ByKey(ctx, key)
	if err == datastore.ErrNoSuchEntity {
		return false, nil
	} else if err != nil {
		log.Errorf(ctx, "Failed to get existance of %v because of %v\n", m, err)
		return false, err
	} else {
		return true, nil
	}
}