如何按屬性對我的集合進行分組？

Question

我按類別得到了與

{categories:"category 1",name:"etc1"},{categories:"category 1",name:"etc2"},{categories:"category 2",name:"etc3"},{categories:"category 2",name:"etc"}. 

這樣一個集合，在取......哪能組？

Answer 1

流星不能做到這一點對自己，但你可以用下劃線來做到這一點：

//results from .fetch() 
var results = [{categories:"category 1",name:"etc1"},{categories:"category 1",name:"etc2"}.... 

var grouped = _.groupBy(results, function(item) { 
        return item.categories; 
       }); 

你應該得到這樣的背：

{"category 1":[{"categories":"category 1","name":"etc1"},{"categories":"category 1","name":"etc2"}],"category 2":[{"categories":"category 2","name":"etc3"},{"categories":"category 2","name":"etc"}]}