问题描述
我是一个使用React-native和Firebase创建移动应用程序的初学者.我在许多文档中都有一个值，我想更新所有文档中的值
I'm a beginner creating an mobile app with react-native and firebase.I have a value stored in many documents and i want to update the value in all the documents
我尝试使用.where()子句，但出现错误
i tried with .where() clause but i got an error
firebase.firestore().collection('myCollection').where('myValue','==','oldValue').update({myValue:newValue});
我希望数据会改变，但是我得到了这个警告:
I expected the data changed but i got this warning:
Possible Unhandled Promise Rejection (id: 0):
TypeError: _reactNativeFirebase.default.firestore(...).collection(...).where(...).update is not a function
请原谅我的英语不好
推荐答案
Firestore无法提供一种基于文档的当前值批量更新文档的方法.没有类似SQL的更新位置"类型的语法.您必须首先查询并阅读所有要更改的文档，然后使用它们的新值对其进行更新.
Firestore doesn't provide a way to update documents in bulk based on their current values. There is no SQL-like "update where" type of syntax. You'll have to first query and read all the documents you want to change, then update them with their new values.
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