我的问题在于无法通过关联检索数据。 从控制台运行setup()后,我希望firstTurbine.getPlant()返回关联的工厂,但它返回undefined。 我花了很多时间寻找解决方案,我可能找不到合适的地方。
相关代码如下:
Ext.regApplication({
name: "app",
launch: function() {
//app.views.viewport = new app.views.Viewport();
}
});
app.models.Plant = Ext.regModel("Plant", {
fields: [
{name: "id", type: "int"},
{name: "name", type: "string"},
{name: "notes", type: "auto"}
],
proxy: {type: 'localstorage', id:'plantStorage'}
});
app.models.Turbine = Ext.regModel("Turbine", {
fields: [
{name: "id", type: "int"},
{name: "plant_id", type: "int"},
{name: "name", type: "string"},
{name: "notes", type: "auto"}
],
proxy: {type: 'localstorage', id:'turbineStorage'},
belongsTo: 'Plant'
});
app.stores.plants = new Ext.data.Store({
model: "Plant",
autoLoad: true,
data : [
{id: 1, name: 'Plant1', notes: ["Note1", "Note2"]},
{id: 2, name: 'Plant2', notes: ["Note1", "Note2"]},
{id: 3, name: 'Plant3', notes: ["Note1", "Note2"]}
]
});
app.stores.turbines = new Ext.data.Store({
model: "Turbine",
autoLoad: true,
data: [
{id: 11, "plant_id": 1, name: "T41", notes: ["Turbine note 1", "Turbine note 2"]},
{id: 12, "plant_id": 1, name: "T13", notes: ["Turbine note 1", "Turbine note 2"]}
]
});
function setup(){
firstPlant = app.stores.plants.getAt(0);
if(!firstPlant){
firstPlant = Ext.ModelMgr.create({name:"TestPlant1", id: 1}, "Plant");
app.stores.plants.add(firstPlant);
app.stores.plants.sync();
}
firstTurbine = app.stores.turbines.getAt(0);
if(!firstTurbine){
firstTurbine = Ext.ModelMgr.create({name:"T31", id: 30, plant_id: 1}, "Turbine");
app.stores.turbines.add(firstTurbine);
app.stores.turbines.sync();
}
return {firstTurbine: firstTurbine, firstPlant: firstPlant};
}
答案 0 :(得分:2)
belongsTo关联创建的getter函数将回调函数作为参数。回调函数将相关对象作为其第一个参数。
turbine.getPlant(function(Plant){
console.log(Plant);
});
我将附上一个完整的工作实例,因为这会让我感到很头疼,也许还有其他人。
首先是json数据:
{
"plants": [{
"id": 1,
"name": "Plant1",
"notes": ["Note1", "Note2"]
}],
"turbines": [
{
"id": 11,
"plant_id": 1,
"name": "T41",
"notes": ["Turbine note 1", "Turbine note 2"]
}]
}
和javascript:
Ext.regApplication({
name: "app",
launch: function() {}
});
app.models.Plant = Ext.regModel("Plant", {
fields: ["id", "name", "notes"],
proxy: {
type: 'ajax',
url: 'data.json',
reader: {
type: 'json',
root: 'plants'
}
}
});
app.models.Turbine = Ext.regModel("Turbine", {
fields: ["id", "plant_id", "name", "notes"],
proxy: {
type: 'ajax',
url: 'data.json',
reader: {
type: 'json',
root: 'turbines'
}
},
belongsTo: 'Plant'
});
app.stores.plants = new Ext.data.Store({
model: "Plant"
});
app.stores.turbines = new Ext.data.Store({
model: "Turbine",
autoLoad: {
callback: function(records) {
var turbine = records[0];
turbine.getPlant(function(Plant){
console.log(Plant);
});
}
}
});