Firebase-在没有安全节点的情况下获取数据？-Firebase-FetchDataWithoutSecureNodes?

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I would structure your db like so:

我会这样构建你的数据库：

root: {
  clients: {
    abc: { 
        data: {
            name: "person1"
        },
        trainer: {
            123: true
        }
    },
    def: { 
        data: {
            name: "person2"
        },
        trainer: {
            123: true
        }
    }
  },
  trainers: {
    123: {
      clients: {
        abc: true,
        def: true
      }
    }
  }
}

With the following rules. I think it would be easier to just enforce the read and write rules on the client_id object, like so:

遵守以下规则。我认为在client_id对象上强制执行读写规则会更容易，如下所示：

{
  "rules": {
    "clients" : {
      "$client_id" : {
        ".read": "auth.uid === $client_id || data.child('trainer/'+auth.uid).exists()",
        ".write" : "data.child('trainer/'+auth.uid).exists()"
      }
    },
    "trainers": {
      "$trainer_id": {
        ".read": "auth.uid === $trainer_id || data.child('clients/'+auth.uid).exists()",
        ".write": "auth.uid === $trainer_id"
      }
    }
  }
}

To get a trainer's clients you'd first fetch the trainer's node and then fetch the client's info for each client under the client's node.

要获得培训师的客户，您首先要获取培训师的节点，然后获取客户端节点下每个客户端的客户端信息。

Fetching the info of all clients under a trainer (I don't know Obj C but I think this should work.)

获取培训师下所有客户的信息（我不知道Obj C，但我认为这应该有用。）

[[self.trainersRef child:[NSString stringWithFormat:@"%@/clients", userId]] observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
  for ( FDataSnapshot *child in snapshot.children) {
    [[self.clientsRef child:[NSString stringWithFormat:@"%@/data", child.key]] observerEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull dataSnapshot) {
      // Client info available here.
    }];
  }
}];