Javascript beforeSave导致查询不返回任何内容
我有一个云函数,它接收请求,创建对象,并将它们关联到一系列承诺中。如果没有beforeSave,此函数可以正常工作,但beforeSave用于防止电子邮件类中重复输入电子邮件地址 请求Javascript beforeSave导致查询不返回任何内容,javascript,parse-platform,promise,parse-cloud-code,Javascript,Parse Platform,Promise,Parse Cloud Code,我有一个云函数,它接收请求,创建对象,并将它们关联到一系列承诺中。如果没有beforeSave,此函数可以正常工作,但beforeSave用于防止电子邮件类中重复输入电子邮件地址 请求 { "projectDescription": "Testing saveProject", "projectTitle": "This is only a test, in the event of a real post this will have an actual desc
{
"projectDescription": "Testing saveProject",
"projectTitle": "This is only a test, in the event of a real post this will have an actual description",
"isEmailEnabled": true,
"shareEmails": [
"test1@gmail.com",
"test2@gmail.com",
"test3@gmail.com"
],
"userId": "1234"
}
作用
Parse.Cloud.define("saveProject", function(request, response) {
var emails = request.params.shareEmails;
var user = request.params.userId;
var projectDescription = request.params.projectDescription;
var projectTitle = request.params.projectTitle;
var emailStatus = request.params.isEmailEnabled;
var ProjectClass = Parse.Object.extend("Project");
var EmailsClass = Parse.Object.extend("Email");
var EmailsClassAssignment = Parse.Object.extend("EmailAssignment");
var project = new ProjectClass();
var projectO;
var emailQueryArray;
project.set("title", projectTitle);
project.set("createdBy", {
"__type": "Pointer",
"className": "_User",
"objectId": user
});
project.set("description", projectDescription);
project.set("status", true);
project.set("emailShareEnabled", emailStatus);
project.save().then(function(projectObject) {
projectO = projectObject;
}).then(function() {
emails.forEach(function(emailAddress) {
var email = new EmailsClass();
email.set("address", emailAddress);
email.save();
});
}).then(function() {
emails.forEach(function(emailQuery) {
var queryEmail = new Parse.Query("Email");
queryEmail.equalTo("address", emailQuery);
queryEmail.find().then(function(results) {
emailObject = results;
console.log(emailObject);
});
});
});
});
在保存代码之前
Parse.Cloud.beforeSave("Email", function(request, response) {
var query = new Parse.Query("Email");
// Gets the email key value (string) before object is saved
query.equalTo("address", request.object.get("address"));
// Checks to see if an object for that email already exists
query.first({
success: function(object) {
if (object) {
response.error("This email already exisits");
} else {
response.success();
}
},
error: function(error) {
response.error("Could not determine if this email exists");
}
});
});
是否有一种方法可以从保存电子邮件对象中解释回调中的beforeSave,从而确保该对象在那里可以查询
我需要对象在那里,这样我就可以得到每个对象的Id,并在Email assignments类中创建一个指针
很乐意进一步解释代码的任何部分或整个函数。
保存
与查找
一样,是一种异步方法。要等待它们完成,并注意它们是否失败,您需要对循环中创建的所有承诺使用Promise.when
。请参阅和类似的问题
您的代码应该如下所示:
var ProjectClass = Parse.Object.extend("Project");
var EmailsClass = Parse.Object.extend("Email");
var EmailsClassAssignment = Parse.Object.extend("EmailAssignment");
Parse.Cloud.define("saveProject", function(request, response) {
var emails = request.params.shareEmails;
var user = request.params.userId;
var projectDescription = request.params.projectDescription;
var projectTitle = request.params.projectTitle;
var emailStatus = request.params.isEmailEnabled;
var project = new ProjectClass();
project.set("title", projectTitle);
project.set("createdBy", {
"__type": "Pointer",
"className": "_User",
"objectId": user
});
project.set("description", projectDescription);
project.set("status", true);
project.set("emailShareEnabled", emailStatus);
project.save().then(function() {
return Parse.Promise.when(emails.map(function(emailAddress) {
// ^^^^^^ ^^^^^^^^^^^^^^^^^^ ^^^
var email = new EmailsClass();
email.set("address", emailAddress);
return email.save();
// ^^^^^^
}));
}).then(function() {
return Parse.Promise.when(emails.map(function(emailQuery) {
// ^^^^^^ ^^^^^^^^^^^^^^^^^^ ^^^
var queryEmail = new Parse.Query("Email");
queryEmail.equalTo("address", emailQuery);
return queryEmail.find().then(function(results) {
// ^^^^^^
console.log(results);
});
}));
});
});
我的另一个问题是,是否值得在云函数中检查重复项,而不是使用beforeSave来控制顺序,并允许该对象在我查询其Id之前存在。这是否有任何性能问题,并且是否仍然可扩展?我没有看到任何
beforeSave
或重复检查在你的代码中。我只是不明白吗?@JLRishe我在云功能下添加了beforeSave代码谢谢!我对使用承诺和解析都是新手,所以这在这两门课程中都是一堂很好的课!