適當的承諾鏈接

Question

我想在使用一系列請求將其綁定到我的視圖之前構建模型。我很難理解如何利用一個請求的響應來提出下一個請求。我的問題是我的「贊助商」和「經理」屬性是作爲承諾解決的，而不是響應。

$.get("/projects/1") 
.then(function(data){ 
    var manager = $.get("/employees/" + data.ProjectManagerId); 

    data.manager = manager; 
    return data; 
}) 
.then(function(data){ 
    var sponsor = $.get("/employees/" + data.ProjectSponsorId); 

    data.sponsor = sponsor; 
    return data; 
}) 
.then(function(data){ 
    //Bind data to view 

    //data.manager is a promise 
    //data.sponsor is a promise 
}) 
.done(); 

如何確保數據返回，而不是承諾？

Answer 1

它在我看來像經理和贊助商的請求可以並列（同時執行）。

我在那裏拍一個when：

$.get("/projects/1") 
.then(function(data){ 
    var manager_req = $.get("/employees/" + data.ProjectManagerId); 
    var sponsor_req = $.get("/employees/" + data.ProjectSponsorId); 

    return $.when(data, manager_req, sponsor_req); 
}) 
.then(function(data, manager, sponsor){ 
    data.sponsor = sponsor; 
    data.manager = manager; 
    return data; 
}) 
.done(function(data){ 
    //Bind data to view 

    //data.manager is resolved 
    //data.sponsor is resolved 
}); 

---

嵌套時承諾涉及一點點更好地與data：

$.get("/projects/1") 
.then(function(data){ 
    var manager_req = $.get("/employees/" + data.ProjectManagerId); 
    var sponsor_req = $.get("/employees/" + data.ProjectSponsorId); 

    return $.when(manager_req, sponsor_req).then(function(manager, sponsor){ 
    data.sponsor = sponsor; 
    data.manager = manager; 
    return data; 
    }); 
}) 
.done(function(data){ 
    //Bind data to view 

    //data.manager is resolved 
    //data.sponsor is resolved 
});