Parse.com fails when changing user password in beforeSave - parse-platform

Question

I'm trying to reset the passwords of certain test users to a known state for integration testing purposes. However, the line
user.set("password", "testpassword");
Causes the save request to fail with:
Error Domain=Parse Code=141 "The operation couldn’t be completed. (Parse error 141.)"
Here is the relevant beforeSave code:
Parse.Cloud.beforeSave(Parse.User, function(request, response) {
var user = request.object;
Parse.Cloud.useMasterKey();
if (user.get("username").substring(0, 4) === "test") {
console.log("overwriting password for test user.");
user.set("password", "testpassword");
}
response.success();
});

Answer 1

for a full writeup on code 141 check out my other post:
https://stackoverflow.com/a/25360806/3204895
but in this case I'd guess that you're simply accessing the fields in a way that Parse doesn't allow, I see that you're using the master key already so the ACL shouldn't be blocking you, but try using the reserved methods for accessing username and setting the password:
if (user.getUsername().substring(0, 4) === "test") {
console.log("overwriting password for test user.");
user.setPassword("testpassword");
}
if it's that the response.success is happening at the wrong point, although the code looks just fine, account for the async with a promise:
user.save({
password: "testpassword"
}).then(function(savedUser) {
// The save was successful.
response.success(savedUser.getUsername() + "now has a password of 'testpassword'");
}, function(error) {
// The save failed. Error is an instance of Parse.Error.
response.error(user.getUsername() + " saving failed with an error | code: " + error.code + " | message: " + error.message);
});