[英]Backbone.js - guidance on working with rails and nested collections
我在一个嵌套的模型示例中使用codebrew \\ backbone-rails(例如,我有一个Tasks集合,每个Tasks都有一个Details集合-与示例类似。)
我可以加载并创建一系列嵌套视图以显示所需的数据,但是现在在尝试对该数据执行CRUD操作时,我陷入了困境。
例如,假设我更改了外部(上层)对象上的属性,并希望将该数据发送到服务器。 这就是json的样子。 由于我在加载应用程序时“急切地”加载了嵌套数据,因此我将通过更新将其发送回服务器(请查看details_attributes格式) :
{
"task" => {
"name" => "testupdate",
"user_id" => 1,
"id" => 3,
"Details" => [
[0] {
"task_id" => 3,
"break_length" => 4,
"completed" => false,
"id" => 12,
"length" => 25,
"location_id" => nil,
"note" => "test444",
"start_date_time" => "2011-12-15T00:00:00Z"
}
],
"details_attributes" => [
[0] {
"start_date_time" => "2011-12-15T00:00:00Z",
"completed" => false,
"note" => "test444",
"break_length" => 4,
"task_id" => 3,
"id" => 12,
"length" => 25,
"location_id" => nil
}
]
}
}
仅供参考-我已覆盖Task toJSON方法,以用Rails期望的“ _attributes”装饰集合
另一方面,如果我在服务器上以老式的Rails方式(使用嵌套形式)执行此更改,则会发送嵌套对象的哈希(尽管在此示例中只有一个)(请查看Details_attributes):
{
"utf8" => "",
"authenticity_token" => "iv9wYvgqLt3nldVOX4AeAifpFaSHIfEj85MsPUaMiAw=",
"task" => {
"name" => "test",
"details_attributes" => {
"0" => {
"_destroy" => "",
"start_date_time" => "2011-12-15 00:00:00",
"length" => "25",
"completed" => "0",
"note" => "test444",
"break_length" => "4",
"id" => "12"
}
}
},
"commit" => "Update task",
"user_id" => "1",
"id" => "3"
}
关于如何获取我的json,进行更新以使服务器接受它的任何指导?
谢谢你的帮助。
您可以提供一个自定义同步方法来覆盖默认的序列化。 例如(我希望离您的设置不太远)
var json='{"name":"testupdate", "user_id":1, "id":3, "details_attributes":[{"start_date_time":"2011-12-15T00:00:00Z", "completed":false, "note":"test444", "break_length":4, "task_id":3, "id":12, "length":25}]}';
Task = Backbone.Model.extend({
initialize:function() {
this.attrs=new DetailsAttributes(this.get("details_attributes"));
},
sync: function(method, model, options) {
if (method == 'update') {
var data = this.toJSON();
data.details_attributes = {};
this.attrs.each(function(model, ix) {
data.details_attributes[ix] = model.toJSON();
});
console.log(JSON.stringify(data));
options = _.extend({data: data}, options);
}
return Backbone.sync.call(this, method, this, options);
}
});
DetailAttribute= Backbone.Model.extend();
DetailsAttributes= Backbone.Collection.extend({
model:DetailAttribute
});
var tk= new Task(JSON.parse(json));
tk.save();
如果您要检查控制台日志,请访问http://jsfiddle.net/5gZr5/4/ 。
Backbone.sync将使用选项中传递的data属性进行序列化。
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