Parse.com update user Cloud Code giving error 206: cannot modify user

问题

I am trying to write a simple Cloud Code function on Parse Server that updates a user's paramater. My function is as follows:

Parse.Cloud.define("updateUser", function(request, response) {
    var query = new Parse.Query("User");
    query.equalTo("username", request.params.username);
    var type = request.params.type;
    query.first({
        success: function (user) {
            user.set("userType", type);
            user.save(null, {
                success: function (object) {
                    response.success("SUCCESS");
                }, error: function (object, error) {
                    response.error(error);
                }
            });
        }, error: function (error) {
            response.error(error);
        }
    });
});

And this is how I call the function server-side from an Express Node.js app:

Parse.Cloud.run("updateUser", { useMasterKey: true, username: req.body.username, type: req.body.type }, {
    success: function(final) {
        res.send({ res: "SUCCESS" });
    }, error: function(error) {
        res.send({ res: error });
    }
});

The first query returns a user, but the subsequent save throws a "206: cannot modify user" error.

This function worked great on our previous platform, but now is causing issues on Parse Server.

Any help is greatly appreciated.

回答1:

the useMasterKey should be send to the user.save() of your cloud code method and in your code you sent the useMasterKey from your nodeJS app.

so at the end your code should look like the following:

Parse.Cloud.define("updateUser", function(request, response) {
var query = new Parse.Query("User");
query.equalTo("username", request.params.username);
var type = request.params.type;
query.first({
    success: function (user) {
        user.set("userType", type);
        user.save({useMasterKey : true}, {
            success: function (object) {
                response.success("SUCCESS");
            }, error: function (object, error) {
                response.error(error);
            }
        });
    }, error: function (error) {
        response.error(error);
    }
});

});

I would also change my code to use Promises and arrow functions according to the best practices.

Hope it helps.

回答2:

There is a different implementation for it without cloud function. Since it is the current logged in client that will update its "lastActivity" status, You can create a simple method that like this:

_lastActivity = () => {
    var currentUser = Parse.User.current();
    currentUser.set("lastActive", new Date());
    currentUser
      .save()
      .then(result => {
        console.log(result);
      })
      .catch(error => {
        console.log(error);
      });
  };

Now this method an be called at some points when user interacts with your application like: swipes screen, or refreshes a ScrollView component...Or you can call it at intervals as long as their session is active... you know what works best.

Then you can write a query to get all users that are not the current user depending if you want to populate it on a FlatList component. when you save the result in a state, you can then simply use the "lastActive" data from the state by,

Using Icons:

 <Ionicons name="md-radio-button-on" size={15} 
color={new Date() -item.get("lastActive") < 600000? "green": "red"}/>

Text beside the Icon:

<Text style={{fontWeight:"400",color: "#666",fontSize: 12}}>
  {new Date() - item.get("lastActive") < 600000? "online": "offline"}</Text>

Click to see: Image of How this Implementation looks

来源：https://stackoverflow.com/questions/38525834/parse-com-update-user-cloud-code-giving-error-206-cannot-modify-user

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parse-platform