javascript - parse.com 行更新 javascript

Question

我有类(class)并且知道行 ID，请尝试更新此行在本主题中的显示方式

https://parse.com/questions/updating-a-field-without-retrieving-the-object-first

    var Point = Parse.Object.extend("items");
    var point = new Point();
    point.id = "L8bc5utrVD";

    // Set a new value on quantity
    point.set("title", "new title");

    // Save
    point.save(null, {
      success: function(point) {
        // Saved successfully.
      },
      error: function(point, error) {
        // The save failed.
        // error is a Parse.Error with an error code and description.
        console.log('Failed to create new object, with error code: ' + error.message);
      }
});

但出现错误 “无法创建新对象，错误代码:拥有此项目”

Answer 1

当使用new创建point时，它尚未同步。在保存之前获取模型将解决该问题。

使用 promise :

var Point = Parse.Object.extend("items");
var point = new Point();
point.id = "L8bc5utrVD";

point.fetch() // returns a promise
.then(function(){
    point.set("title", "new title");
    return point.save(); // returns a promise
})
.then(successCallback, failCallback);