Support for setting option's control value to be a property of object and option's display value to be another property of the object

I know that if we want the option's control value (what is saved in the form) to be different than the option's display value (what is displayed in the text field), we'll need to set the **displayWith** property on our autocomplete element. as explained here:

https://material.angular.io/components/autocomplete/overview#setting-separate-control-and-display-values

Suppose we have a user object like `{ id: 1, name: 'Abc' }`.

What if we want the option's control value (what is saved in the form) to be **user.id** and option's display value (what is displayed in the actual text field) to be **user.name**?

In my case I want to display a list of users in autocomplete options and when user selects a user, I want to display the selected user name on the user screen but when the form is submitted, I just want user.id to be posted to the server not user.name and not complete user object.

从链接的 Angular Material autocomplete 文档开始，特别是关于设置单独的控件值和显示值的部分，并将其与 issue 中的 user object 示例进行比较。当 autocomplete 在选择后能够显示 user.name，同时提交 user.id 而不是名称或整个对象时，即视为完成。

由索引模型根据 Issue 内容生成。