如何按属性索引我的Laravel收藏

Question

我有一个laravel集合，该集合已按属性“名称”排序。

{
"0":{"id":2,"name":"1","days":["2017-04-06","2017-04-07"]},
"1":{"id":3,"name":"2","days":["2017-04-08","2017-04-09"]},
"2":{"id":4,"name":"3","days":["2017-04-10","2017-04-11"]},
"6":{"id":10,"name":"4","days":["2017-04-12","2017-04-13"]},
"3":{"id":5,"name":"5","days":["2017-04-14","2017-04-15"]},
"4":{"id":6,"name":"6","days":["2017-04-16","2017-04-17"]},
"5":{"id":7,"name":"7","days":["2017-04-18","2017-04-19"]}
}  

但是，此集合的索引没有更改。索引现在为0、1、2、6、3、4、5。是否可以按照排序的集合的顺序重新索引集合？

所以我想拥有的是：

{
"0":{"id":2,"name":"1","days":["2017-04-06","2017-04-07"]},
"1":{"id":3,"name":"2","days":["2017-04-08","2017-04-09"]},
"2":{"id":4,"name":"3","days":["2017-04-10","2017-04-11"]},
"3":{"id":10,"name":"4","days":["2017-04-12","2017-04-13"]},
"4":{"id":5,"name":"5","days":["2017-04-14","2017-04-15"]},
"5":{"id":6,"name":"6","days":["2017-04-16","2017-04-17"]},
"6":{"id":7,"name":"7","days":["2017-04-18","2017-04-19"]}
}  

我尝试使用$collection->values()。但是后来我有了：

[
{"id":2,"name":"1","days":["2017-04-06","2017-04-07"]},
{"id":3,"name":"2","days":["2017-04-08","2017-04-09"]},
{"id":4,"name":"3","days":["2017-04-10","2017-04-11"]},
{"id":10,"name":"4","days":["2017-04-12","2017-04-13"]},
{"id":5,"name":"5","days":["2017-04-14","2017-04-15"]},
{"id":6,"name":"6","days":["2017-04-16","2017-04-17"]},
{"id":7,"name":"7","days":["2017-04-18","2017-04-19"]}
]  

Answer 1

正如Laravel Collections的文档所述，您可以在集合上使用values（）来重置索引：

$resetedIndexesCollection = $yourcollection->values(); 

values方法返回一个新集合，其键重置为连续的整数。

在您的情况下因为没有集合而无法工作的情况下，您有一个json，首先需要json_decode创建一个array，然后收集该数组，现在您有了一个集合，并且可以将values（）方法应用于重置索引，如下所示：

collect(json_decode('{
                "0":{"id":2,"name":"1","days":["2017-04-06","2017-04-07"]},
                "1":{"id":3,"name":"2","days":["2017-04-08","2017-04-09"]},
                "2":{"id":4,"name":"3","days":["2017-04-10","2017-04-11"]},
                "3":{"id":10,"name":"4","days":["2017-04-12","2017-04-13"]},
                "4":{"id":5,"name":"5","days":["2017-04-14","2017-04-15"]},
                "5":{"id":6,"name":"6","days":["2017-04-16","2017-04-17"]},
                "6":{"id":7,"name":"7","days":["2017-04-18","2017-04-19"]}
                }'))->values();

结果如下：

Collection {#287 ?
  #items: array:7 [?
    0 => {#288 ?
      +"id": 2
      +"name": "1"
      +"days": array:2 [?]
    }
    1 => {#407 ?
      +"id": 3
      +"name": "2"
      +"days": array:2 [?]
    }
    2 => {#408 ?
      +"id": 4
      +"name": "3"
      +"days": array:2 [?]
    }
    3 => {#409 ?
      +"id": 10
      +"name": "4"
      +"days": array:2 [?]
    }
    4 => {#410 ?
      +"id": 5
      +"name": "5"
      +"days": array:2 [?]
    }
    5 => {#411 ?
      +"id": 6
      +"name": "6"
      +"days": array:2 [?]
    }
    6 => {#412 ?
      +"id": 7
      +"name": "7"
      +"days": array:2 [?]
    }
  ]
}