数据表树网格 - Salesforce LWC

Question

我是这个LWC的新手，我试图在数据表树网格中显示数据 我将包装班与Apex类一起使用。 我似乎无法找到问题，因为数据不会在表中显示。 要做的

我

<template>
    <lightning-card title="Skills Tree">
        <lightning-tree-grid
            key-field="Id"
            columns={columns}
            data={skillList}
            hide-checkbox-column
        ></lightning-tree-grid>
    </lightning-card>
  </template>

我能够在控制台上看到，所以将其放在桌子上就是

import { LightningElement, wire, track, api } from "lwc";
import getSkillsInventory from "@salesforce/apex/dataTableClass.getSkillsInventory";

export default class DataTableTreeGrid extends LightningElement {
  error;
  @track skillList;
  @track expandedRows = [];
  @track wiredskillListData;
  @track contactId;
  @api recordId;

  @wire(getSkillsInventory, { contactId: "$recordId" })
    wiredskillListData(result) { 
      
      if(result.data){
        console.log('this is data')
        console.log(result.data)
        this.skillList = result.data;
      }else if(result.error){
        console.log('error # ' + result.error);
      }
    } 

  
  constructor() {
    super();
    this.columns = [
      {
        type: "text",
        fieldName: "skillName",
        label: "Skills Name",
        _children: [
          {
            type: "text",
            fieldName: "subskills",
          }
        ],
      },
      {
        type: "text",
        fieldName: "skillProficiency",
        //fieldName: "Name",
        label: "Proficiency"
      },

      { type: "action", typeAttributes: { rowActions: this.getRowActions } }
    ];
  }

  get expandedRowItems() {
    return this.expandedRows;
  }
  getRowActions(row, doneCallback) {
    const actions = [];
    actions.push({
      label: "Edit",
      name: "edit"
    });
    actions.push({
      label: "Delete",
      name: "delete"
    });
    doneCallback(actions);
  }
}

。

public class SkillMatrixWrapper {
    @AuraEnabled
    public List<SkillL1> skillInfoList {get;set;}
    
    public class SkillDetails{
        @AuraEnabled
        public String skillName         {get;set;}

        @AuraEnabled
        public String skillProficiency  {get;set;}
    }
            
    public class SkillL3{
        @AuraEnabled
        public SkillDetails skillInfo {get;set;}
    }
    
    public class SkillL2{
        @AuraEnabled
        public SkillDetails skillInfo {get;set;}

        @AuraEnabled
        public List<SkillL3> subskills {get;set;}
    }
    
    public class SkillL1{
        @AuraEnabled
        public SkillDetails skillInfo {get;set;}

        @AuraEnabled
        public List<SkillL2> subskills {get;set;}
           
        public SkillL1(SkillDetails skillInfoDetails){
            skillInfo = skillInfoDetails;
            subskills = new List<SkillL2>{};
        }
        
    }
    
    
}