// ApplyTo returns a new SelectBuilder after applying the paging effects of
// `p` to `sql`. This method provides the default case for paging: int64
// cursor-based paging by an id column.
func (p PageQuery) ApplyTo(
sql sq.SelectBuilder,
col string,
) (sq.SelectBuilder, error) {
sql = sql.Limit(p.Limit)
cursor, err := p.CursorInt64()
if err != nil {
return sql, err
}
switch p.Order {
case "asc":
sql = sql.
Where(fmt.Sprintf("%s > ?", col), cursor).
OrderBy(fmt.Sprintf("%s asc", col))
case "desc":
sql = sql.
Where(fmt.Sprintf("%s < ?", col), cursor).
OrderBy(fmt.Sprintf("%s desc", col))
default:
return sql, errors.Errorf("invalid order: %s", p.Order)
}
return sql, nil
}
