初始 orderBy() 字段“[[FieldPath([id]), true]][0][0]”必须与 where() 字段参数相同

Question

同时执行 Orderby 和 Query 时 Firestore 出现错误

我不知道它是包还是查询。什么时候

      body: PaginateFirestore(
        itemBuilderType: PaginateBuilderType.listView,
        itemBuilder: (index, context, documentSnapshot) {
          final data = documentSnapshot.data() as Map?;
          // final sub = data.
          return InkWell(
            onTap: () {},
            child: ListTile(
              leading: CircleAvatar(child: Icon(Icons.person)),
              title: data == null ? Text('Error in data') : Text(data['id']),
            ),
          );
        },
        // orderBy is compulsory to enable pagination
        query: FirebaseFirestore.instance.collection('Phones').where('price',isGreaterThan:'560' ).orderBy('id',descending: true),
        // to fetch real-time data
        isLive: true,
      ),
    );
  }
  

运行代码时出错

    The following assertion was thrown building Retrive(dirty):
The initial orderBy() field "[[FieldPath([id]), true]][0][0]" has to be the same as the where() field parameter "FieldPath([price])" when an inequality operator is invoked.
'package:cloud_firestore/src/query.dart':
Failed assertion: line 484 pos 13: 'conditionField == orders[0][0]'

Answer 1

当使用不等运算符时，初始 orderBy() 字段“[[FieldPath([id]), true]][0][0]”必须与 where() 字段参数“FieldPath([price])”相同被调用。

这意味着第一个orderBy必须是您执行不等式查询的字段，即price。

• 更新您的查询：

query: FirebaseFirestore.instance.collection('Phones').where('price',isGreaterThan:'560' ).orderBy('id',descending: true)

到：

query: FirebaseFirestore.instance.collection('Phones').where('price',isGreaterThan:'560' ).orderBy('price').orderBy('id',descending: true)

• 运行此查询，您将在控制台上收到一条消息以及一个链接，表明您需要创建一个索引。

• 单击链接并创建索引。

• 等待索引完成创建过程并再次运行查询。