groupby

listToTreeByGroup(list, groupBy, level, aggregates){

let nodeList = [];

let nodeMapping = {};

list.forEach(v=>{

let id = v[groupBy[level]];

if(!nodeMapping[id]){

let node = { id, pid:level>0?groupBy[level-1]:null,data:[],level };

nodeMapping[id] = node;

nodeList.push(node);

}

nodeMapping[id].data.push(v);

})

nodeList.forEach(node=>{

let ch = this.listToTreeByGroup(node.data,groupBy,level+1,aggregates);

node.children = ch.nodeList;

Object.assign(nodeMapping, ch.nodeMapping);

})

return {nodeList,nodeMapping};

}