为什么 Microsoft Graph 需要 $select 和 $expand=extensions? [英] why does Microsoft Graph require $select with $expand=extensions?

问题描述

在 Graph Explorer 中，当我进行身份验证并使用获取开放扩展"示例时，它会针对此端点执行 GET:

In the Graph Explorer, when I authenticate and use the "get an open extension" sample, it does a GET against this endpoint:

https://graph.microsoft.com/v1.0/me?$select=id,displayName,mail,mobilePhone&$expand=extensions

这将返回我在创建开放扩展"示例中添加的任何扩展.但是如果我删除 $select 参数，使端点看起来像这样......

That returns any extensions I've added with the "create an open extension" sample. But if I remove the $select parameter so that the endpoint looks like this ...

https://graph.microsoft.com/v1.0/me?$expand=extensions

...然后我收到一条错误消息，指出'microsoft.graph.user'类型的实体实例值没有属性'id'的值."看来我需要一个$select参数来返回扩展的扩展.而且 $select 值是什么并不重要 - 我可以使用一个与 JSON 有效负载中的任何字段都不对应的无意义字符串，并且它工作正常.

... then I get an error stating that ""The entity instance value of type 'microsoft.graph.user' doesn't have a value for property 'id'." It seems I need to have a $select parameter to return the expanded extensions. And it doesn't matter what the $select value is - I can use a nonsensical string that doesn't correspond to any fields in the JSON payload, and it works fine.

为什么在这种情况下需要 $select 参数?

Why is a $select parameter required in this case?

推荐答案

除了 $select=fieldnotfound 之外，我可以复制这个.无论是否使用该 $select 语句，我都会返回相同的错误.我无法解释为什么你会看到这种行为，但我可以提供一些关于这里出了什么问题的见解.

I'm able to replicate this with exception of $select=fieldnotfound. I get the same error returned with or without that $select statement. I can't explain why this you're seeing that behavior but I can provide some insight into what is going wrong here.

首先介绍一下幕后发生的事情.

First a little background on what is happening under the covers.

当您在没有附加参数的情况下调用 /me 时，会自动使用默认的 $select 参数.默认情况下，它使用以下内容:

When you call /me with no additional params, a default $select parameter is used automatically. By default it uses the following:

$select=businessPhones,displayName,givenName,jobTitle,mail,mobilePhone,officeLocation,preferredLanguage,surname,userPrincipalName,id

如您所见，id 实际上是所选字段之一.理论上，简单地添加 $expand=extentions 应该可以按预期工作.不幸的是，添加 $expand 似乎也稍微改变了底层 $select 语句中的字段.即，它删除 id 字段:

As you can see, id is in fact one of the selected fields. In theory, simply adding $expand=extentions should therefore work as expected. Unfortunately it seems that adding $expand also slightly changes the fields in underlying $select statement as well. Namely, it drops the id field:

$select=businessPhones,displayName,givenName,jobTitle,mail,mobilePhone,officeLocation,preferredLanguage,surname,userPrincipalName

如果我同时使用两者，它会按预期工作:

If I use specify both however, it works as expected:

https://graph.microsoft.com/v1.0/me?$select=businessPhones,displayName,givenName,jobTitle,mail,mobilePhone,officeLocation,preferredLanguage,surname,userPrincipalName,id&$expand=扩展

我怀疑这是关于默认字段选择的错误，但我会向 Graph 团队提出这个问题.上面的查询至少应该允许您在此期间继续前进.

I suspect this is a bug around the default field select but I'll defer to the Graph team on that. The above query should at least allow you to move forward in the meantime.

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