Question

我正在尝试使用Parse Cloud为String值实现一个简单的getter和setter函数，但由于某种原因它不起作用。我搜索了Parse文档和论坛，但找不到原因。请告诉我。

function setPassword(newPass){
    console.log('setPassword() started with input ' +newPass);
    var PasswordItem = Parse.Object.extend("PasswordItem");
    var query = new Parse.Query(PasswordItem);
    if (query.length > 0) {
        if (query[0].password != newPass) {
            console.log('setPassword() found existing password. replacing it with ' +newPass);
            query[0].password = newPass;
        }else{
            console.log('setPassword() found existing password. existing password is the same as the new one');
        }
    }else{
        console.log('setPassword() no existing password. creating new password: ' +newPass);
        var passwordItem = new PasswordItem();
        passwordItem.set("password", newPass);
        passwordItem.save(null, {
            success: function (results) {
                console.log("Save ok");
                response.success(results);
            },
            error: function (results, error) {
                console.log("Save error");
                response.error(error);
            }});
    }
}

function getPassword(){
    console.log('getPassword() started');
    var password = new String();
    var PasswordItem = Parse.Object.extend("PasswordItem");
    var query = new Parse.Query(PasswordItem);
    if (query.length > 0) {
        password = query[0].password;
    }else{
        password = "";
    }
    console.log('getPassword() returns ' +password);
    return password;
}

请注意，请忽略与密码相关的安全问题，这只是一个例子。

Answer 1

经过多次尝试，我得到了这段代码。似乎我理解的主要问题是Parse函数save（）是异步的，因此我不能期望在不使用Futures的情况下获得结果。我是JavaScript的新手，所以我将不胜感激。

function getPassword(req, res){
    console.log('getPassword() started');
    var query = new Parse.Query(PasswordItem);
    query.descending('createdAt');
    query.find({
        success: function(results) {
            console.log('getPassword() successfully found ' +results.length +' passwords');
            if (results.length > 0){
                password = results[0].get("password");
                console.log('getPassword() got password ' +password);
            }else{
                password = "";
                console.log('getPassword() got empty password');
            }
        },
        error: function(error) {
            console.log('getPassword() error searching for passwords ' +error.message);
            password = null;
        }
    }).then(function() {
            renderAll(req, res);
    });
    console.log('getPassword() ended');
}

function setPassword(req, res){
    console.log('setPassword() started with input ' +newPass);
    Parse.Cloud.useMasterKey();
    var newPass = req.body.password;
    var query = new Parse.Query(PasswordItem);
    if (query.length > 0) {
        if (query[0].password != newPass) {
            console.log('setPassword() found existing password. replacing it with ' +newPass);
            query[0].password = newPass;
        }else{
            console.log('setPassword() found existing password. existing password is the same as the new one');
        }
    }else{
        console.log('setPassword() no existing password. creating new password: ' +newPass);
        var passwordItem = new PasswordItem();
        passwordItem.set("password", newPass);
        passwordItem.save(null, {
            success: function(results) {
                console.log("Save ok");
            },
            error: function(results, error) {
                console.log("Save error");
            }
        }).then(function(input) { 
                getPassword(req, res);
            });
    }
}

function clearPasswords(req, res){
    console.log('clearPasswords() started');
    Parse.Cloud.useMasterKey();
    var query = new Parse.Query(PasswordItem);
    query.descending('createdAt');
    query.find({
        success: function(results) {
            console.log('clearPasswords() successfully found ' +results.length +' passwords');
            for (var i = 0; i < results.length; i++) { 
                results[i].destroy();
            }
        },
        error: function(error) {
            console.log('clearPasswords() error searching for passwords ' +error.message);
        }
    }).then(function() {
            setPassword(req, res);
    });
    console.log('clearPasswords() ended');
}

解析云集并获取功能

1 个答案: