Azure 逻辑应用程序，使用时解析的 JSON 返回 Null

问题描述

我正在尝试访问从两 (2) 个图形 API 调用中收到的 JSON 输出中的值，但每次尝试使用它们时，我都会收到此错误：

表达评估失败。模板操作'For_each' 的执行失败：'foreach' 表达式'@body('Parse_JSON_-_Managed_Devices')?['body']?['value']' 的评估结果是'Null' 类型。结果必须是一个有效的数组。

我已验证我的图形 API 调用格式正确，并且输出正是我期望从两个 API 调用返回的内容。每次尝试访问 Azure Runbook 中解析的 JSON 或任何其他逻辑应用任务时，我都会收到此错误。

我很想知道是否有人以前遇到过这种情况以及如何解决？

图形查询： https://graph.microsoft.com/beta/deviceManagement/managedDevices/?$select=id,emailAddress&$filter=operatingSystem eq 'windows'

受管设备的 JSON 架构

 {
 "properties": {
     "body": {
         "properties": {
             "@@odata.context": {
                 "type": "string"
             },"@@odata.count": {
                 "type": "integer"
             },"@@odata.nextLink": {
                 "type": "string"
             },"value": {
                 "items": {
                     "properties": {
                         "azureADdeviceid": {
                             "type": "string"
                         },"deviceName": {
                             "type": "string"
                         },"emailAddress": {
                             "type": "string"
                         },"id": {
                             "type": "string"
                         },"managedDeviceName": {
                             "type": "string"
                         },"userdisplayName": {
                             "type": "string"
                         },"userId": {
                             "type": "string"
                         }
                     },"required": [
                         "id","userId","deviceName","userdisplayName","azureADdeviceid","managedDeviceName","emailAddress"
                     ],"type": "object"
                 },"type": "array"
             }
         },"type": "object"
     }
 },"type": "object"

}

图形查询： https://graph.microsoft.com/beta/users?$select=id,officeLocation&$filter=accountEnabled eq true

用于用户的 JSON 架构 图查询：displayName": { "type": "string" },"mail": { "type": "string" },"officeLocation": { "type": "string" } },"displayName","mail","officeLocation" ],"type": "object"

}

解决方法

我认为您的架构不应包含 body。这是我根据响应正文生成的架构。

{
    "properties": {
        "@@odata.context": {
            "type": "string"
        },"@@odata.nextLink": {
            "type": "string"
        },"value": {
            "items": {
                "properties": {
                    "displayName": {
                        "type": "string"
                    },"id": {
                        "type": "string"
                    },"mail": {
                        "type": "string"
                    },"officeLocation": {}
                },"required": [
                    "id","displayName","mail","officeLocation"
                ],"type": "object"
            },"type": "array"
        }
    },"type": "object"
}

那你可以试试用这个表达：

body('Parse_JSON_-_Managed_Devices')?['value']