使用 Firebase RuleDataSnapshot 方法访问用户数据
Using Firebase RuleDataSnapshot Methods to access user data
如果我有这样的数据:
root{
PrivateRooms{
<PrivateRoomName>{
...
}
}
users{
<uid>{
permissionFrom{
<PrivateRoomName>:value is not private room name
}
...
}
}
}
...我如何编写规则以根据用户的权限授予对 的访问权限children?
我认为这行得通:
{
"rules": {
"PrivateRooms" : {
"$roomName":{
".read" : "root.child('users').child(auth.uid).child('permissionFrom').hasChild('$roomName') == true",
".write" : "root.child('users').child(auth.uid).child('permissionFrom').hasChild('$roomName') == true"
}
},
"users" : {
".read" : true,
".write" : true
}
}
}
...但是一定是规则有问题,因为这个数据快照被跳过了:
var testRef = new Firebase('https://my.firebaseio.com/privateRooms/<privateRoomName>/privRoomChild');
testRef.once("value", function(snapshot){
var testVal = snapshot.val();
console.log(testVal);
});
在您的规则中,$roomName
是一个变量,因此不应用引号引起来。
"$roomName":{
".read" : "root.child('users').child(auth.uid).child('permissionFrom').hasChild($roomName)",
".write" : "root.child('users').child(auth.uid).child('permissionFrom').hasChild($roomName)"
}
如果我有这样的数据:
root{
PrivateRooms{
<PrivateRoomName>{
...
}
}
users{
<uid>{
permissionFrom{
<PrivateRoomName>:value is not private room name
}
...
}
}
}
...我如何编写规则以根据用户的权限授予对
我认为这行得通:
{
"rules": {
"PrivateRooms" : {
"$roomName":{
".read" : "root.child('users').child(auth.uid).child('permissionFrom').hasChild('$roomName') == true",
".write" : "root.child('users').child(auth.uid).child('permissionFrom').hasChild('$roomName') == true"
}
},
"users" : {
".read" : true,
".write" : true
}
}
}
...但是一定是规则有问题,因为这个数据快照被跳过了:
var testRef = new Firebase('https://my.firebaseio.com/privateRooms/<privateRoomName>/privRoomChild');
testRef.once("value", function(snapshot){
var testVal = snapshot.val();
console.log(testVal);
});
在您的规则中,$roomName
是一个变量,因此不应用引号引起来。
"$roomName":{
".read" : "root.child('users').child(auth.uid).child('permissionFrom').hasChild($roomName)",
".write" : "root.child('users').child(auth.uid).child('permissionFrom').hasChild($roomName)"
}