小编Dan*_*tiz的帖子

我一直在努力寻找基于某些可能添加或可能不添加的条件来执行具有多个条件查询的查询的正确方法。我尝试了多种方法，但没有效果。

Future<QuerySnapshot> searchStuff(StuffModel stuff) async {

    CollectionReference col = _firestore.collection(Constants.stuffCollection);

    Query query = col.where('uid', isEqualTo: stuff.uid);

    if (stuff.who != null) {
      query = query.where('who', isEqualTo: stuff.who);
    }
    if (stuff.what != null) {
      query = query.where('what', isEqualTo: stuff.what);
    }
    if (stuff.where != null) {
      query = query.where('where', isEqualTo: stuff.where);
    }
    if (stuff.when != null) {
      query = query.where('when', isEqualTo: Timestamp.fromDate(stuff.when));
    }

    return await query.getDocuments();
  }