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我爲分析框架編寫了一個異步雲後臺作業，該作業根據他們的電子郵件在'@'符號之前生成每個用戶的顯示用戶名。不幸的是，當我運行這個工作時，我收到了一個錯誤「太多的計數操作」。有沒有辦法讓查詢和保存串聯運行而不是並行運行？我在文檔中看到了承諾的可能性，但我很困惑如何使它適用於嵌套查詢。在分析框架中運行同步查詢雲代碼
Parse.Cloud.job("generateUsernameForEveryUser", function(request, status) {
// Set up to modify user data
Parse.Cloud.useMasterKey();
var counter = 0;
// Query for all users
var query = new Parse.Query(Parse.User);
query.each(function(user) {
createUsernameForUser(user, 0, {
success: function(username) {
if(username == null) {
status.error();
} else {
user.set("displayUsername", username);
user.set("displayUsernameUppercase", username.toUpperCase());
user.save();
}
},
error: function(error) {
status.error("Error: " + error.message);
}
});
}).then(function() {
// Set the job's success status
status.success("Username generation completed successfully.");
}, function(error) {
// Set the job's error status
status.error("Uh oh, something went wrong.");
});
});
function createUsernameForUser(user, count, callback) {
var generatedUsername = user.getEmail().substring(0, user.getEmail().indexOf("@"));
if(count > 0) {
//Quotes added to ensure no math is done between generatedUsername and count
generatedUsername = "" + generatedUsername + "" + count;
}
var userQuery = new Parse.Query(Parse.User);
userQuery.equalTo("displayUsernameUppercase", generatedUsername.toUpperCase());
userQuery.count({
success: function(userCount) {
if(userCount > 0) {
createUsernameForUser(user, count + 1, {
success : function(responseUsername) {
callback.success(responseUsername);
},
error: function(error) {
callback.error(error.message);
}
});
}
else {
callback.success(generatedUsername);
}
},
error: function(error) {
console.log("Error trying to count users: " + error.message);
callback.error("Error trying to count users: " + error.message);
}
});//End of userQuery call
}