在mule dataweave中组合来自不同父数组的JSON数组

我有一个类似下面的JSON

{
    "packages": [
        {
            "screenings": [
                {
                    "data": {
                        "educationHistory": [
                            {
                                "school": "Test education 4"
                            },
                            {
                                "school": "Test education 4"
                            }
                        ]

                    }
                },
                {
                    "data": {
                        "educationHistory": [
                            {
                                "major": [
                                    "Business Admin."
                                ],
                                "school": "Test education 1"
                            },
                            {
                                "major": [
                                    "Business Admin."
                                ],
                                "school": "Test education 1"
                            }
                        ]

                    }
                }
            ]
        }
    ]
}

<ns0:EmploymentHistory>
    <ns0:Employer>
      <ns0:EmployerName>
        <school>Test education 4</school>
      </ns0:EmployerName>
    </ns0:Employer>
    <ns0:Employer>
      <ns0:EmployerName>
        <school>Test education 4</school>
      </ns0:EmployerName>
    </ns0:Employer>
    <ns0:Employer>
      <ns0:EmployerName>
        <school>Test education 1</school>
      </ns0:EmployerName>
    </ns0:Employer>
    <ns0:Employer>
      <ns0:EmployerName>
        <school>Test education 1</school>
      </ns0:EmployerName>
    </ns0:Employer>
</ns0:EmploymentHistory>

在dataweave中，我是这样写的

ns0#EmploymentHistory: {(
    payload.packages[0].screenings.data.educationHistory map {
        ns0#Employer: {
            ns0#EmployerName: $.school
        }
    }
)}

我得到这样的输出

<ns0:EmploymentHistory>
<ns0:Employer>
  <ns0:EmployerName>
    <school>Test education 4</school>
    <school>Test education 4</school>
  </ns0:EmployerName>
</ns0:Employer>
<ns0:Employer>
  <ns0:EmployerName>
    <school>Test education 1</school>
    <school>Test education 1</school>
  </ns0:EmployerName>
</ns0:Employer>
</ns0:EmploymentHistory>

测试教育4
测试教育4
测试教育1
测试教育1

我需要像下面这样的

{
    "packages": [
        {
            "screenings": [
                {
                    "data": {
                        "educationHistory": [
                            {
                                "school": "Test education 4"
                            },
                            {
                                "school": "Test education 4"
                            }
                        ]

                    }
                },
                {
                    "data": {
                        "educationHistory": [
                            {
                                "major": [
                                    "Business Admin."
                                ],
                                "school": "Test education 1"
                            },
                            {
                                "major": [
                                    "Business Admin."
                                ],
                                "school": "Test education 1"
                            }
                        ]

                    }
                }
            ]
        }
    ]
}

<ns0:EmploymentHistory>
    <ns0:Employer>
      <ns0:EmployerName>
        <school>Test education 4</school>
      </ns0:EmployerName>
    </ns0:Employer>
    <ns0:Employer>
      <ns0:EmployerName>
        <school>Test education 4</school>
      </ns0:EmployerName>
    </ns0:Employer>
    <ns0:Employer>
      <ns0:EmployerName>
        <school>Test education 1</school>
      </ns0:EmployerName>
    </ns0:Employer>
    <ns0:Employer>
      <ns0:EmployerName>
        <school>Test education 1</school>
      </ns0:EmployerName>
    </ns0:Employer>
</ns0:EmploymentHistory>

测试教育4
测试教育4
测试教育1
测试教育1

---

此xpath

payload.packages[0].screenings.data.educationHistory映射{

循环通过

筛选

非

教育历史

您需要使用后代选择器

。

，一次获取所有

教育历史

值。这将从父元素搜索整个树（在本例中为

有效负载.packages[0]

），并获取每个匹配的子元素（在本例中为

educationHistory

）。由于

educationHistory

在这两个实例中都是一个数组，因此这将返回一个数组，因此我们需要使用

展平

，因此我们有一个对象数组：

%dw 1.0
%output application/xml

%var employers = flatten payload.packages[0]..educationHistory
---
{
  EmploymentHistory: {
    (employers map {
      Employer: {
        EmployerName: {
          School: $.school
        }
      }
    })
  }
}

您可以找到有关后代选择器的信息。以下是MuleSoft的官方词汇：

[子体选择器]使用

。

的形式应用于上下文，并检索当前上下文下子树中所有匹配键：值对的值。无论这些字段组织在何种层次结构中，它们都位于输出中的同一级别