Power Query Expression错误：无法将类型为“ Record”的值转换为类型“ Text”

问题描述

我有一个问题，我无法执行以下代码。语法似乎还可以，但是当我尝试执行它时，得到的响应是：

Expression.Error：我们无法将Record类型的值转换为Type“ Text”。 细节： 值= [记录] 类型= [类型]

let
body="{
""page"": ""1"",""pageSize"": ""100"",""requestParams"": {
    ""deviceUids"": [
        ""xxx-yyy-xxx-yyyy-xxxx"",""yyy-xxx-yyy-xxxx-yyyy"",""aaa-bbb-aaa-bbbb-aaaa"",""ccc-ddd-ccc-dddd-cccc""
    ],""entityColumns"": [
        {
            ""entityId"": ""144"",""joinColumnName"": ""device_uid"",""columnName"": ""device_random_date""
        }
    ],""columnNames"": [
        ""ts"",""device_uid"",""1"",""32"",""55"",""203"",""204""
    ],""startUnixTsMs"": ""1583413637000"",""endUnixTsMs"": ""1583413640000"",""columnFilters"": [
        {
            ""filterType"": ""eq"",""columnName"": ""55"",""value"": ""1234""
        }
    ],""sortOrder"": [
        {
            ""column"": ""ts"",""order"": ""DESC""
        },{
            ""column"": ""55"",""order"": ""ASC""
        }
    ],""entityFilters"": [
        {
            ""entityId"": ""144"",""entityEntryIds"": [
                ""12345-221-232-1231-123456""
            ]
        }
    ]
}
}",Parsed_JSON = Json.Document(body),BuildQueryString = Uri.BuildQueryString(Parsed_JSON),Quelle = Json.Document(Web.Contents("http://localhost:8101/device-data-reader-api/read-paginated/xxx-xxx-yyyy-yyyy",[Headers=[#"Content-Type"="application/json"],Content = Text.ToBinary(BuildQueryString)]))

在 奎尔

我试图删除数字的引号，但这会导致相同的问题，因为系统抱怨它无法将数字转换为文本。 我需要需要随请求移交的主体才能进行POST请求。我在做什么错了？

解决方法

由于您似乎想以application/json的形式发送此邮件，因此我认为您应该在代码中更改此位：

Content = Text.ToBinary(BuildQueryString)

收件人：

Content = Text.ToBinary(body)

，然后您还将摆脱下面的行（因为您不需要它们）：

Parsed_JSON = Json.Document(body),BuildQueryString = Uri.BuildQueryString(Parsed_JSON),

除非您想以Uri.BuildQueryString的形式发送（即URL编码的键值对），否则我认为您不需要application/x-www-form-urlencoded。

---

不相关：如果有帮助，则可以在M中构建结构，然后使用JSON.FromValue将结构转换为字节，然后可以将其直接放入POST正文中。下面是未经测试的示例。

let
    body = [
        page = "1",pageSize = "100",requestParams = [
            deviceUids = {
                "xxx-yyy-xxx-yyyy-xxxx","yyy-xxx-yyy-xxxx-yyyy","aaa-bbb-aaa-bbbb-aaaa","ccc-ddd-ccc-dddd-cccc"
            },entityColumns = {
                [
                    entityId = "144",joinColumnName = "device_uid",columnName = "device_random_date"
                ]
            },columnNames = {
                "ts","device_uid","1","32","55","203","204"
            },startUnixTsMs = "1583413637000",endUnixTsMs = "1583413640000",columnFilters = {
                [
                    filterType = "eq",columnName = "55",value = "1234"
                ]
            },sortOrder = {
                [
                    column = "ts",order = "DESC"
                ],[
                    column = "55",order = "ASC"
                ]
            },entityFilters = {
                [
                    entityId = "144",entityEntryIds = {
                        "12345-221-232-1231-123456"
                    }
                ]
            }
        ]
    ],Quelle = Json.Document(
        Web.Contents(
            "http://localhost:8101/device-data-reader-api/read-paginated/xxx-xxx-yyyy-yyyy",[
                Headers = [#"Content-Type" = "application/json"],Content = Json.FromValue(body)
            ]
        )
    )
in
    Quelle

这看起来可能有点奇怪（因为M使用[]而不是{}，{}而不是[]和=而不是{{1} }），但只是提及以防万一。