ORDERBY在linq.js

Question

一个分组集合多数民众赞成在不工作的代码：

var grouping = Enumerable.from(periods) 
        .select(function(p){return new PeriodViewModel(p)}) 
        .groupBy("$.periodNumber") 
        .orderBy("$.date") 
        .toArray(); 

的periodviewmodels被periodNumber分组和日期应由日期进行排序上升，但是这不会发生，我猜猜它是因为orderBy中的选择器应该以某种方式引用分组结果...

我不知道。这是测试数据，所以你可以尝试自己：

{ 
    "periods": [ 
     { 
      "id": 1, 
      "content": "this is not a test", 
      "date": 1, 
      "periodNumber": 1, 
      "documents": [ 
       { 
        "name": "Homework.doc" 
       }, 
       { 
        "name": "Todo.xls" 
       } 
      ] 
     }, 
     { 
      "id": 3, 
      "content": "this might be a test", 
      "date": 2, 
      "periodNumber": 1, 
      "documents": [ 
       { 
        "name": "Homework.doc" 
       }, 
       { 
        "name": "Todo.xls" 
       } 
      ] 
     }, 
     { 
      "id": 5, 
      "content": "This is a clause", 
      "date": 3, 
      "periodNumber": 1, 
      "documents": [ 
       { 
        "name": "Homework.doc" 
       }, 
       { 
        "name": "Todo.xls" 
       } 
      ] 
     }, 
     { 
      "id": 1, 
      "content": "and not sth to share for all", 
      "date": 5, 
      "periodNumber": 2, 
      "documents": [ 
       { 
        "name": "Homework.doc" 
       }, 
       { 
        "name": "Todo.xls" 
       } 
      ] 
     }, 
     { 
      "id": 2, 
      "content": "hello kitty???", 
      "date": 2, 
      "periodNumber": 3, 
      "documents": [ 
       { 
        "name": "Homework.doc" 
       }, 
       { 
        "name": "Todo.xls" 
       } 
      ] 
     }, 
     { 
      "id": 1, 
      "content": "Flynnie winnie", 
      "date": 1, 
      "periodNumber": 3, 
      "documents": [ 
       { 
        "name": "Homework.doc" 
       }, 
       { 
        "name": "Todo.xls" 
       } 
      ] 
     }, 
     { 
      "id": 1, 
      "content": "what do yo say about chol and ra?", 
      "date": 1, 
      "periodNumber": 4, 
      "documents": [ 
       { 
        "name": "Homework.doc" 
       }, 
       { 
        "name": "Todo.xls" 
       } 
      ] 
     } 
    ] 
} 

Answer 1

排序项目之前，你分组他们。您无法从群组中访问date。

var query = Enumerable.from(periods) 
    .select(function (p){ return new PeriodViewModel(p); }) 
    .orderBy("$.date") 
    .groupBy("$.periodNumber") 
    .toArray();