QueryPredicate andPredicates(Iterable<QueryPredicate> predicates)

Joins together a list of predicates by the 'and' token.

For combining multiple predicate together.

Source 

static QueryPredicate andPredicates(Iterable<QueryPredicate> predicates) {
  var predicateList = predicates.toList();
  if (predicateList == null) {
    return null;
  }

  if (predicateList.length == 0) {
    return null;
  }

  if (predicateList.length == 1) {
    return predicateList.first;
  }

  var predicateFormat =
      "(" + predicateList.map((pred) => "${pred.format}").join(" AND ") + ")";

  var valueMap = <String, dynamic>{};
  predicateList.forEach((p) {
    p.parameters?.forEach((k, v) {
      if (valueMap.containsKey(k)) {
        throw new QueryPredicateException(
            "Duplicate keys in and predicate, $k appears in multiple predicates. Make keys more specific.");
      }
      valueMap[k] = v;
    });
  });

  return new QueryPredicate(predicateFormat, valueMap);
}