更新嵌套对象Firebase [英] Updating nested objects firebase

问题描述

从Firebase注意:

From the Firebase note:

给出像 alanisawesome ， updateChildren()之类的单个键路径仅更新第一个子级别的数据，并且处理传递到第一个子级别之外的任何数据作为 setValue()操作.多路径行为允许使用更长的路径(例如 alanisawesome/nickname )而不会覆盖数据.这就是第一个示例与第二个示例不同的原因.

Given a single key path like alanisawesome, updateChildren() only updates data at the first child level, and any data passed in beyond the first child level is a treated as a setValue() operation. Multi-path behavior allows longer paths (like alanisawesome/nickname) to be used without overwriting data. This is why the first example differs from the second example.

我正在尝试在代码中使用单个函数 createOrUpdateData(object).如果进行更新，它将正确更新第一级子级，但是如果我已传递嵌套对象，则它将删除该嵌套对象的所有其他属性.

I am trying to use a single function createOrUpdateData(object) in my code. In case of update, it updates first level children properly, but if I have nested object passed, then it deletes all other properties of that nested object.

这是代码:

function saveUserDetails(email,object){
        var hashedEmail = Utilities.getHashCode(email);
        var userRef = ref.child(hashedEmail);
        return $q(function(resolve,reject){
            return userRef.update(object, function(error){
                if(error){
                    reject(error);
                }else{
                    resolve("Updated successfully!");
                }
            });
        });
    }

所以，如果我通过:

{
   name: 'Rohan Dalvi', 
   externalLinks: { 
      website: 'mywebsite'
   }
}

然后它将删除externalLinks对象内的其他属性.有没有更干净，更简单的方法来避免这种情况?

Then it will delete other properties inside externalLinks object. Is there a cleaner and simpler way of avoiding this?

简而言之，如何确保仅更新嵌套对象而不会删除数据.

In short, how do I make sure nested objects are only updated and that data is not deleted.

推荐答案

您可以使用多路径更新.

var userRef = ref.child(hashedEmail);
var updateObject = {
   name: 'Rohan Dalvi', 
   "externalLinks/website": 'mywebsite'
};
userRef.update(updateObject);

通过在对象文字中使用"externalLinks/website" 语法，它将嵌套路径视为更新，而不是嵌套对象的集合.这可防止嵌套数据被删除.

By using the "externalLinks/website" syntax in the object literal it will treat the nested path as an update and not a set for the nested object. This keeps nested data from being deleted.

这篇关于更新嵌套对象Firebase的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！