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[英]How to merge Primary object with child objects using and ID reference in Parent to each child
[英]How to push id of parent object to child objects?
我有一个 object 数组,它有一个 object 的内部数组,我想将父 object 的 id 推送给每个子 ZA8CFDE6331BD5B6666
a = [
{id: 'abc', stage: [{name: 'car' , value: '123'},{name: 'bus' , value: '345'},{name: 'truck' , value: '567'}],
{id: 'def', stage: [{name: 'bike' , value: '890'},{name: 'cycle' , value: '123'},{name: 'car' , value: '456'}]}
]
expected output = [
{name: 'car' , value: '123', id: 'abc'},{name: 'bus' , value: '345', 'abc'},{name: 'truck' , value: '567', 'abc'}, {name: 'bike' , value: '890', id: 'def'},{name: 'cycle' , value: '123',id: 'def',id: 'def'},{name: 'car' , value: '456', id: 'def'}
]
我能够获得唯一的舞台,但无法将 id 推送到每个 object。 请帮忙
const getAllStages = [].concat(...map(a, el => el.stage));
console.log(getAllStages )
再次使用.map()
将el.stage
添加到el.id
的每个元素。
您可以在外部映射中使用.flatMap()
将所有结果连接到一个数组中。
const a = [ {id: 'abc', stage: [{name: 'car', value: '123'},{name: 'bus', value: '345'},{name: 'truck', value: '567'}]}, {id: 'def', stage: [{name: 'bike', value: '890'},{name: 'cycle', value: '123'},{name: 'car', value: '456'}]} ] result = a.flatMap(({ id, stage }) => stage.map(s => ({ id: id, ...s }))); console.log(result);
您可以在不使用库的情况下这样编写
let a = [
{
id: 'abc', stage:
[
{ name: 'car', value: '123' },
{ name: 'bus', value: '345' },
{ name: 'truck', value: '567' }
]
},
{
id: 'def', stage:
[
{ name: 'bike', value: '890' },
{ name: 'cycle', value: '123' },
{ name: 'car', value: '456' }
]
}
]
let output = [];
for (const element of a) {
for (const stageElement of element.stage) {
let newElement = {
name: stageElement.name,
value: stageElement.value,
id: element.id
};
output.push(newElement);
}
}
如果您尝试合并id
:
let remapped = a.map(e => ({ id: a.id, ...e }));
其中将每个条目转换为 object 继承a.id
值并添加 object 中的其他任何内容。
这是一个例子和结果:)
a.forEach(function(row) {
row.stage.map(function (child) {child.id = row.id})
})
结果:
[{"id":"abc","stage":[{"name":"car","value":"123","id":"abc"},{"name":"bus","value":"345","id":"abc"},{"name":"truck","value":"567","id":"abc"}]},{"id":"def","stage":[{"name":"bike","value":"890","id":"def"},{"name":"cycle","value":"123","id":"def"},{"name":"car","value":"456","id":"def"}]}]
const a = [
{id: 'abc', stage: [{name: 'car' , value: '123'},{name: 'bus' , value: '345'},{name: 'truck' , value: '567'}]},
{id: 'def', stage: [{name: 'bike' , value: '890'},{name: 'cycle' , value: '123'},{name: 'car' , value: '456'}]}
]
a.forEach(item => {
const itemId = item.id;
const stages = item.stage;
stages.forEach(stage => {
stage['id'] = itemId;
})
});
console.log(a);
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