Firestore请求中何时指定writefield以及用什么替换它们?

编辑:2020年3月4日: Map.diff() writeFields 功能

这个 地图差异() https://firebase.google.com/docs/reference/rules/rules.Map#diff

在规则中使用它:

// Returns a MapDiff object
map1.diff(map2)

A MapDiff 对象具有以下方法

addedKeys() // a set of strings of keys that are in after but not before
removedKeys() // a set of strings of keys that are in before but not after
changedKeys() // a set of strings of keys that are in both maps but have different values 
affectedKeys() // a set of strings that's the union of addedKeys() + removedKeys() + updatedKeys()
unchangedKeys() // a set of strings of keys that are in both maps and have the same value in both

例如:

// This rule only allows updates where "a" is the only field affected
request.resource.data.diff(resource.data).affectedKeys().hasOnly(["a"])

编辑:2018年10月4日: 写入字段 Firestore不再支持,其功能最终将被删除。

writeFields 写入字段 ,因为它只处理来自客户端SDK的请求。为了测试writefield,模拟器本身似乎无法完全按照需要模拟请求。所以,如果你写的规则 写入字段