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一、概述
1. 在Ember Data上以每个实例为基础，records被持久化。在DS.Model的任何一个实例上调用save()并且它将会并且它将产生一个网络请求。
2. 下面是一些例子：
var post = store.createRecord(‘post‘, { title: ‘Rails is Omakase‘, body: ‘Lorem ipsum‘ }); post.save(); // => POST to ‘/posts‘
store.findRecord(‘post‘, 1).then(function(post) { post.get(‘title‘); // => "Rails is Omakase" post.set(‘title‘, ‘A new post‘); post.save(); // => PUT to ‘/posts/1‘ });
二、Promises
1. save()返回一个promise，所以它是非常容易处理成功和失败的情况的。这里是一个普遍的模式：
var post = store.createRecord(‘post‘, { title: ‘Rails is Omakase‘, body: ‘Lorem ipsum‘ }); var self = this; function transitionToPost(post) { self.transitionToRoute(‘posts.show‘, post); } function failure(reason) { // handle the error } post.save().then(transitionToPost).catch(failure); // => POST to ‘/posts‘ // => transitioning to posts.show route
2. promises甚至使处理失败的网络请求变得容易：
var post = store.createRecord(‘post‘, { title: ‘Rails is Omakase‘, body: ‘Lorem ipsum‘ }); var self = this; var onSuccess = function(post) { self.transitionToRoute(‘posts.show‘, post); }; var onFail = function(post) { // deal with the failure here }; post.save().then(onSuccess, onFail); // => POST to ‘/posts‘ // => transitioning to posts.show route
3. 在这里 here你可以学到更多关于promises，但是这里是另外一个关于展示如何重试持久化的例子：
function retry(callback, nTimes) { // if the promise fails return callback().catch(function(reason) { // if we haven‘t hit the retry limit if (nTimes > 0) { // retry again with the result of calling the retry callback // and the new retry limit return retry(callback, nTimes - 1); } // otherwise, if we hit the retry limit, rethrow the error throw reason; }); } // try to save the post up to 5 times retry(function() { return post.save(); }, 5);
7.5 Models -- Persisting Records
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原文地址：http://www.cnblogs.com/sunshineground/p/5165955.html
