Typescript - 如何為json對象創建嵌套接口

Question

我正在嘗試創建我已創建Interface的嵌套json對象。我收到錯誤，因為Type of property serservicesAndHeads are incompatible並且表示Property is missing 。 我的界面如下：

  interface  Head {
    HeadNumber?: string;
    HeadDescription?: string;
  };

  interface  ServicesAndHead {
    majorService?: string;
    subMajorService?: string;
    servicesAndHeads:Head[];
  }

  export interface MyTableItem {
   demandNo?: string;
   demandName?: string;
   servicesAndHeads?:ServicesAndHead;
   //servicesAndHeads?:ServicesAndHead[];
  }

我的json看起來像這樣：

  const dataItem: MyTableItem =
  {
    demandNo: 'Demand Number 2',
    demandName: 'Animal Husbandary, Livestock, Fisheries and Veterinary Services',
    servicesAndHeads: [
    {
      majorService: 'C-Economic Service',
      subMajorService: '(a) Agriculture and Allied Activities',
      majorHead: [
       { majorHeadNumber: '3098', majorHeadDescription: 'Animal Husbandry' },
       { majorHeadNumber: '3999', majorHeadDescription: 'Diary Development' },
       { majorHeadNumber: '4902', majorHeadDescription: 'Fisheries' }
      ]
    },
    {
      majorService: 'C- Capital Account of Economic Services',
      subMajorService: '(a) Capital Account of Agriculture and Allied Activities',
      majorHead: [
        { majorHeadNumber: '0012', majorHeadDescription: 'Capital Outlay on Animal ' },
        { majorHeadNumber: '3245', majorHeadDescription: 'Capital Outlay on Fisheries' }
      ]
     }
   ]
  }

我也嘗試過這樣做來嵌套serviceAndHead

  servicesAndHeads?: {
      [key: string]:ServicesAndHead,
      majorHeads?: {
        [key: string]:MajorHead
      };
  };

我如何糾正我的代碼以接受所述json。

Answer 1

定義接口如下：

interface  Head {
   majorHeadNumber?: string;
   majorHeadDescription?: string;
};

interface  ServicesAndHead {
   majorService?: string;
   subMajorService?: string;
   majorHead: Head[];
}

export interface MyTableItem {
   demandNo?: string;
   demandName?: string;
   servicesAndHeads?:ServicesAndHead[];
}

這將與您的Json對象兼容。

const dataItem: MyTableItem = {

    demandNo: 'Demand Number 2',
    demandName: 'Animal Husbandary, Livestock, Fisheries and Veterinary Services',
    servicesAndHeads: [
    {
       majorService: 'C-Economic Service',
       subMajorService: '(a) Agriculture and Allied Activities',
       majorHead: [
       { 
          majorHeadNumber: '3098', 
          majorHeadDescription: 'Animal Husbandry' 
       },
       { 
          majorHeadNumber: '3999', 
          majorHeadDescription: 'Diary Development'
       },
       { 
          majorHeadNumber: '4902', 
          majorHeadDescription: 'Fisheries'
       }]
     },
     {
       majorService: 'C- Capital Account of Economic Services',
       subMajorService: '(a) Capital Account of Agriculture and Allied Activities',
       majorHead: [
       { 
          majorHeadNumber: '0012', 
          majorHeadDescription: 'Capital Outlay on Animal '
       },
       { 
          majorHeadNumber: '3245', 
          majorHeadDescription: 'Capital Outlay on Fisheries'
       }]
     }]
    }

Answer 2

ServicesAndHead接口將servicesAndHeads屬性定義為必需屬性，但dataItem.servicesAndHeads的數組元素都缺少此屬性。 它們具有majorHead屬性。 或許，你的意思

interface  ServicesAndHead {
  majorService?: string;
  subMajorService?: string;
  majorHead: Head[];
}

如果是這樣，您還需要調整Head界面，如下所示：

interface  Head {
  majorHeadNumber?: string;
  majorHeadDescription?: string;
};