我很好奇为什么Model.save()响应的结果集中包含的记录不能正确返回更新的关联数据，尽管更新的数据包含在服务器响应中...
示例型号和商店定义：
Ext.define("App.model.test.Parent",{
extend: 'Ext.data.Model',
requires: ['App.model.test.Child'],
fields: [
{name: 'id', type: 'int' },
{name: 'name', type: 'string'},
{name: 'kids', type: 'auto', defaultValue: []}
],
idProperty: 'id',
hasMany: [{
foreignKey: 'parent_id',
model: 'App.model.test.Child',
associationKey: 'kids',
name: 'getKids'
}],
proxy: {
type: 'ajax',
api : {
create: '/service/test/create/format/json',
read : '/service/test/read/format/json',
update : '/service/test/update/format/json'
},
reader: {
idProperty : 'id',
type : 'json',
root : 'data',
successProperty : 'success',
messageProperty : 'message'
},
writer: {
type : 'json',
writeAllFields : true
}
}
});
Ext.define("App.model.test.Child",{
extend: 'Ext.data.Model',
fields: [
{name: 'id', type: 'int' },
{name: 'name', type: 'string'},
{name: 'parent_id', type: 'int'}
]
});
Ext.define("App.store.test.Simpson",{
storeId: 'TheSimpsons',
extend: 'Ext.data.Store',
model : 'App.model.test.Parent',
autoLoad: true,
autoSync: false
});
应用服务器使用单个模型以及其关联数据对代理的READ请求进行响应。这都是工作正常的海ry！
服务器对读取请求的响应
{
"data":{
"id":1,
"name":"Homer Simpson",
"children":{
"1":{
"id":1,
"name":"Bart Simpson"
},
"2":{
"id":2,
"name":"Lisa Simpson"
},
"3":{
"id":3,
"name":"Maggie Simpson"
}
}
},
"success":true,
"message":null
}
到目前为止，一切都按计划进行...
store = Ext.create("App.store.test.Simpson");
homer = store.getById(1);
kids = homer.getKids().getRange();
console.log("The Simpson Kids", kids); // [>constructor, >constructor, >constructor]
具有保存和更新请求的意外行为开始
这是我对UPDATE请求的测试响应...
/** Server UPDATE Response */
{
"data":{
"id":1,
"name":"SAVED Homer Simpson",
"kids":[{
"id":1,
"name":"SAVED Bart Simpson",
"parent_id":1
},{
"id":2,
"name":"SAVED Lisa Simpson",
"parent_id":1
},{
"id":3,
"name":"SAVED Maggie Simpson",
"parent_id":1
}]
},
"success":true,
"message":null
}
/** Will call proxy UPDATE, response is above */
homer.save({
success: function(rec, op){
var savedRec = op.getRecords().pop(),
kidNames = '';
console.log(savedRec.get('name')); // SAVED Homer Simpson = CORRECT!
Ext.each(savedRec.getKids().getRange(), function(kid){
kidNames += kid.get('name') + ", ";
});
console.log(kids);
//Outputs: Bart Simpson, Lisa Simpson, Maggie Simpson = WRONG!!
}
})
[我注意到，如果我检查服务器返回的记录，则所包含的记录所生成的关联存储（即getKidsStore）是原始记录，即它们的名称中没有“ SAVED”。返回记录的kids属性，但是确实包含正确的数据。
如果我正确理解了该问题，则是Ext.data.reader.Reader无法正确地使用.save()响应中包含的关联数据来更新关联存储。如果是这样，我认为这是非常不直观的，因为我希望与处理store.load()请求并填充生成的关联存储的读取器具有相同的行为。
有人能指出我正确的方向来实现我所追求的行为吗？
免责声明：此处提出了相同的问题：ExtJs 4 - Load nested data on record save，但没有响应。我觉得我的问题要更彻底。.
EDIT：我已经在Sencha论坛上发布了这个问题：http://www.sencha.com/forum/showthread.php?270336-Associated-Data-in-Model.save()-Response
编辑（8/23/13）：我用一个完整的例子以及其他发现重写了这篇文章……
confusion处于getRecords()的Ext.data.Operation方法中。此方法返回“尽管该操作初始化后，代理可能会在某些时候修改这些记录的数据，但是将返回该操作的初始配置记录。”根据文档。这确实使IMO感到困惑，因为返回的记录确实已更新，但是生成的关联存储以及关联数据却没有！这就是导致我感到困惑的原因，似乎记录中包含来自应用程序服务器的更新数据，但事实并非如此。
为了帮助我的头脑简单地从响应中获取
FULLY
更新的数据，我向Ext.data.Operation类中添加了一个方法...我只是编写了此方法，并且对其进行的测试不超过确保我正在寻找的功能，因此使用后果自负！[请记住，我不调用store.sync（），而是实例化模型并调用model.save（）方法，所以我的resultSet通常只包含一条记录...Ext.override(Ext.data.Operation,{
getSavedRecord: function(){
var me = this, // operation
resultSet = me.getResultSet();
if(resultSet.records){
return resultSet.records[0];
}else{
throw "[Ext.data.Operation] EXCEPTION: resultSet contains no records!";
}
}
});
现在我已经能够实现我所追求的功能...
// Get the unsaved data
store = Ext.create('App.store.test.Simpson');
homer = store.getById(1);
unsavedChildren = '';
Ext.each(homer.getKids().getRange(), function(kid){
unsavedChildren += kid.get('name') + ",";
});
console.log(unsavedChildren); // Bart Simpson, Lisa Simpson, Maggie Simpson
// Invokes the UPDATE Method on the proxy
// See original post for server response
home.save({
success: function(rec, op){
var savedRecord = op.getSavedRecord(), // the magic! /sarcasm
savedKids = '';
Ext.each(savedRecord.getKids().getRange(), function(kid){
savedKids += kid.get('name') + ',';
});
console.log("Saved Children", savedKids);
/** Output is now Correct!!
SAVED Bart Simpson, SAVED Lisa Simpson, SAVED Maggie Simpson
*/
}
});
编辑13/10/12我还向Ext.data.Model添加了一个方法，称为updateTo，该方法用于将记录更新为提供的记录，该记录还处理关联。我将其与上面的getSavedRecord方法结合使用。请注意，这不处理任何belongsTo关联，因为我不在我的应用程序中使用它们，但是该功能很容易添加。
/**
* Provides a means to update to the provided model, including any associated data
* @param {Ext.data.Model} model The model instance to update to. Must have the same modelName as the current model
* @return {Ext.data.Model} The updated model
*/
updateTo: function(model){
var me = this,
that = model,
associations = me.associations.getRange();
if(me.modelName !== that.modelName)
throw TypeError("updateTo requires a model of the same type as the current instance ("+ me.modelName +"). " + that.modelName + " provided.");
// First just update the model fields and values
me.set(that.getData());
// Now update associations
Ext.each(associations, function(assoc){
switch(assoc.type){
/**
* hasOne associations exist on the current model (me) as an instance of the associated model.
* This instance, and therefore the association, can be updated by retrieving the instance and
* invoking the "set" method, feeding it the updated data from the provided model.
*/
case "hasOne":
var instanceName = assoc.instanceName,
currentInstance = me[instanceName],
updatedInstance = that[instanceName];
// Update the current model's hasOne instance with data from the provided model
currentInstance.set(updatedInstance.getData());
break;
/**
* hasMany associations operate from a store, so we need to retrieve the updated association
* data from the provided model (that) and feed it into the current model's (me) assocStore
*/
case "hasMany":
var assocStore = me[assoc.storeName],
getter = assoc.name,
newData = that[getter]().getRange();
// Update the current model's hasMany association store with data from the provided model's hasMany store
assocStore.loadData(newData);
break;
// If for some reason a bogus association type comes through, throw a type error
// At this time I have no belongsTo associations in my application, so this TypeError
// may one day appear if I decide to implement them.
default:
throw TypeError("updateTo does not know how to handle association type: " + assoc.type);
break;
}
});
// Commit these changes
me.commit();
return me;
}
所以基本上我会做类似的事情（理论上在Order控制器中）
doSaveOrder: function(order){
var me = this, // order controller
orderStore = me.getOrderStore(); // magic method
// Save request
order.save({
scope: me,
success: function(responseRecord, operation){
// note: responseRecord does not have updated associations, as per post
var serverRecord = operation.getSavedRecord(),
storeRecord = orderStore.getById(order.getId());
switch(operation.action){
case 'create':
// Add the new record to the client store
orderStore.add(serverRecord);
break;
case 'update':
// Update existing record, AND associations, included in server response
storeRecord.updateTo(serverRecord);
break;
}
}
});
}
我希望这可以帮助像我一样困惑的人！