Backbone.js的Underscore.js过滤收集VS阵列 [英] Backbone.js Underscore.js filtering a collection vs array
问题描述
我基本上试图做什么用这一问题完成的,但具有一个数组并返回使用相应的数组,而不仅仅是该值的值的所有的对象:
<一href=\"http://stackoverflow.com/questions/11762105/filter-backbone-collection-by-attribute-value\">Filter骨干集合根据属性值
我的天性是使用_.filter或_.partition的人收藏,但我对如何这些被比较和放困惑;回来了,我没有得到期望的结果。
通过以下,通过路由器传递ID中:
friendsRoute:功能(ID){
人=新App.Collections.Persons();
persons.fetch()。完成(功能(){
VAR单= persons.find(功能(我){
返回i.get('身份证')== ID;
});
VAR friendsIds = single.get('朋友');
VAR的朋友=?
// VAR friendsList =新App.Views.FriendsList();
//friendsList.render({朋友:朋友});
});
},
我有一个friendsIds阵列(Joe的朋友):
friendsIds = [1,4,5]
和试图从以下JSON获得匹配的ID和我friendsList视图中显示它们的名称:
[
{ID:1,名:史蒂夫,年龄:22,朋友:[4]},
{ID:2,名:玛丽,时代:18,朋友:[1,3]},
{ID:3,名:乔,时代:43,朋友:[1,4,5]},
{ID:4,名:汤米,时代:19,朋友:[1]},
{ID:5,名:张国荣,年龄:27,朋友:[2,4]}
]
我想你可以使用 <$ C的组合$ C>地图 和 findWhere
做到这一点:
VAR的朋友= _.map(friendsIds,功能(ID){
返回_.findWhere(人,{ID:ID});
});
I'm basically trying to do what is done with this question, but with an array and return all objects using the values of the corresponding array, not just the value: Filter backbone collection by attribute value
My natural instinct is to use _.filter or _.partition on the persons collection, but am confused on how these are being compared & returned and am not getting the desired outcome.
With the following, passing the id in via the router:
friendsRoute: function(id){
persons = new App.Collections.Persons();
persons.fetch().done(function(){
var single = persons.find(function(i){
return i.get('id') == id;
});
var friendsIds = single.get('friends');
var friends = ?
//var friendsList = new App.Views.FriendsList();
//friendsList.render({ friends: friends });
});
},
I have a friendsIds array (Joe's friends):
friendsIds = [1,4,5]
And trying to get the matched ids from the following JSON and display their names in my friendsList view:
[
{ "id": 1, "name": "Steve", "age": 22, "friends": [4] },
{ "id": 2, "name": "Mary", "age": 18, "friends": [1,3] },
{ "id": 3, "name": "Joe", "age": 43, "friends": [1,4,5] },
{ "id": 4, "name": "Tommy", "age": 19, "friends": [1] },
{ "id": 5, "name": "Leslie", "age": 27, "friends": [2,4] }
]
I think you could use a combination of map
and findWhere
to do this:
var friends = _.map(friendsIds, function(id) {
return _.findWhere(persons, { 'id': id });
});
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