带parent参数的JS Reduce

Question

我正在尝试解决我的reduce函数的最后一个问题，即将嵌套的JSON对象转换为平面列表，以便更容易地进行搜索。

将JSON放在下面

    {
  "MovementPatterns": [
    {
      "Id": "",
      "Name": "Warm-up",
      "Exercises": [
        {
          "Id": "",
          "Name": "Lizard Stretch",
          "Level": 1,
          "EquipmentRequired": ""
        },
        {
          "Id": "",
          "Name": "Pigeon Stretch",
          "Level": 1,
          "EquipmentRequired": ""
        },
        {
          "Id": "",
          "Name": "Core Hold",
          "Level": 1,
          "EquipmentRequired": ""
        },
        {
          "Id": "",
          "Name": "Superman",
          "Level": 1,
          "EquipmentRequired": ""
        }
      ]
    },
    {
      "Name": "Horizontal Push",
      "Id": "",
      "Exercises": [
        {
          "Id": "",
          "Name": "Wall Push-up",
          "Level": 0,
          "VideoUrl": "",
          "EquipmentRequired": ""
        },
        {
          "Id": "",
          "Name": "Push-up",
          "Level": 1,
          "EquipmentRequired": ""
        },
        {
          "Id": "",
          "Name": "Tap Push-up",
          "Level": 2,
          "EquipmentRequired": ""
        },
        {
          "Id": "",
          "Name": "Explosive Push-up",
          "Level": 3,
          "EquipmentRequired": ""
        }
      ]
    }
  ]
}

我使用了以下代码：

const exercises = data.MovementPatterns.reduce(
  (a, {Exercises}) => [...a, ...Exercises, ...a],
  [],
);

将来自每个运动模式的所有练习扁平化到一个纯exercises...This列表中是很棒的，但我现在需要在该JSON中为每个练习包含父运动模式ID，例如

[
        {
          "Id": "",
          "Name": "Lizard Stretch",
          "Level": 1,
          "MovementPatternId": 1,
          "EquipmentRequired": ""
        },
....
        {
          "Id": "",
          "Name": "Wall Push-up",
          "Level": 1,
          "MovementPatternId": 2,
          "EquipmentRequired": ""
        },
]

有人能帮我弄清楚如何使用reduce函数来做这件事吗？)

谢谢

Answer 1

你就快成功了。只需将父元素的Id作为MovementPatternId附加到Exercises的每个元素即可。

const exercises = ab.MovementPatterns.reduce(
  (a, { Exercises, Id }) => [
    ...a,
    ...Exercises.map(e => ({ ...e, MovementPatternId: Id }))
  ],
  []
);