如何从对象中获取值作为数组

Question

我们需要将对象转换为对象数组并在字段上进行映射，但字段是增量的，如 field1、field2，这就是我们遇到的问题。我尝试了以下代码：

output application/json
---
payload.main.field map(value) -> {
 "name": value.name,
 "age": value.age,
 "location": value.location[0].country
}

输入：

{
  "main": {
    "field1": {
      "name": "value",
      "age": 20,
      "address": {
        "location": [
          {
            "country": "US",
            "zipcode": 1234
          },
          {
            "country": "US",
            "zipcode": 1234
          }
        ]
      }
    },
    "field2": {
      "name": "pqr",
      "age": 23,
      "address": {
        "location": [
          {
            "country": "CA",
            "zipcode": 1235
          },
          {
            "country": "US",
            "zipcode": 1234
          }
        ]
      }
    },
    "field3": {
      "name": "abc",
      "age": 22,
      "address": {
        "location": [
          {
            "country": "BU",
            "zipcode": 1236
          },
          {
            "country": "US",
            "zipcode": 1234
          }
        ]
      }
    }
  }
}

对于上面的输入，下面是预期的响应。

预期输出：

{
 "main": [
    {
    "name": "value",
    "age": 20
    "location": "US"
    },
    {
    "name": "pqr",
    "age": 23
    "location": "CA"
    },
    {
    "name": "abc",
    "age": 22
    "location": "BU"
    }
    ]
}

对于location，当数组大小不为0且country不为null时，就像location[0].country。

Answer 1

output application/json
---

    main : payload.main pluck $ map {
            "name": $.name,
            "age": $.age,
            "location": if( sizeOf($.address.location) !=0) $.address.location[0].country else "N/A"
}

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