刚开始，userInfo里面的id我默认以为是User表的id，但是后面稍微看了一下返回的数据，userId跟replyId一致，我就知道userInfo里的id指的是Reply的id（应该是命名冲突，先查Reply有没有id，没有，再查User的id，有的话直接就用了）

{
    "code": 0,
    "message": "操作成功",
    "data": {
        "pageInfo": {
            "current": 1,
            "total": 3,
            "pages": 1
        },
        "list": [
            {
                "replyId": 2,
                "content": "123456",
                "userId": 1,
                "toReplyId": 1,
                "threadId": 1,
                "isDelete": false,
                "createTime": "2024-10-29T16:20:54",
                "userInfo": {
                    "userId": 2,
                    "nickName": "123456"
                }
            },
            {
                "replyId": 3,
                "content": "123456",
                "userId": 2,
                "toReplyId": 1,
                "threadId": 1,
                "isDelete": false,
                "createTime": "2024-10-29T16:50:49",
                "userInfo": {
                    "userId": 3,
                    "nickName": null
                }
            },
            {
                "replyId": 4,
                "content": "12345",
                "userId": 2,
                "toReplyId": 1,
                "threadId": 1,
                "isDelete": false,
                "createTime": "2024-10-29T16:55:00",
                "userInfo": {
                    "userId": 4,
                    "nickName": null
                }
            }
        ]
    }
}

当时我突发奇想，指定表名能成功吗？

当然是不行的：

{
    "code": 0,
    "message": "操作成功",
    "data": {
        "pageInfo": {
            "current": 1,
            "total": 3,
            "pages": 1
        },
        "list": [
            {
                "replyId": 2,
                "content": "123456",
                "userId": 1,
                "toReplyId": 1,
                "threadId": 1,
                "isDelete": false,
                "createTime": "2024-10-29T16:20:54",
                "userInfo": {
                    "userId": null,
                    "nickName": "123456"
                }
            },
            {
                "replyId": 3,
                "content": "123456",
                "userId": 2,
                "toReplyId": 1,
                "threadId": 1,
                "isDelete": false,
                "createTime": "2024-10-29T16:50:49",
                "userInfo": null
            },
            {
                "replyId": 4,
                "content": "12345",
                "userId": 2,
                "toReplyId": 1,
                "threadId": 1,
                "isDelete": false,
                "createTime": "2024-10-29T16:55:00",
                "userInfo": null
            }
        ]
    }
}

到后面想到了表里不是有user_id吗，直接用就可以了：

{
    "code": 0,
    "message": "操作成功",
    "data": {
        "pageInfo": {
            "current": 1,
            "total": 3,
            "pages": 1
        },
        "list": [
            {
                "replyId": 2,
                "content": "123456",
                "userId": 1,
                "toReplyId": 1,
                "threadId": 1,
                "isDelete": false,
                "createTime": "2024-10-29T16:20:54",
                "userInfo": {
                    "userId": 1,
                    "nickName": "123456"
                }
            },
            {
                "replyId": 3,
                "content": "123456",
                "userId": 2,
                "toReplyId": 1,
                "threadId": 1,
                "isDelete": false,
                "createTime": "2024-10-29T16:50:49",
                "userInfo": {
                    "userId": 2,
                    "nickName": null
                }
            },
            {
                "replyId": 4,
                "content": "12345",
                "userId": 2,
                "toReplyId": 1,
                "threadId": 1,
                "isDelete": false,
                "createTime": "2024-10-29T16:55:00",
                "userInfo": {
                    "userId": 2,
                    "nickName": null
                }
            }
        ]
    }
}