包含没有映射表

Question

我有两个模型（Users和Teams）多对多通过第三个映射模型（TeamUsers）相关。 现在，我想获得团队并加入用户，而不在显示的JSON中显示映射表内容。

例如：

var teams = await _context
    .Teams
    .Include(t => t.TeamUsers)
    .ThenInclude(u => u.User)
    .ToListAsync();

返回：

[
    {
        "teamId": 1,
        "name": "Dev Team",
        "avatart": null,
        "createdAt": "0001-01-01T00:00:00",
        "teamUsers": [
            {
                "teamId": 1,
                "userId": 1,
                "user": {
                    "userId": 1,
                    "firstName": "John",
                    "secondName": null,
                    "lastName": "Doe",
                    "email": null,
                    "avatar": null,
                    "teamUsers": []
                }
            }
        ]
    }
]               

但是我想要这个：

[
    {
        "teamId": 1,
        "name": "Dev Team",
        "avatart": null,
        "createdAt": "0001-01-01T00:00:00",
        "teamUsers": [
            {
                "userId": 1,
                "firstName": "christopher",
                "secondName": null,
                "lastName": "elstner",
                "email": null,
                "avatar": null,
                "teamUsers": []
            }
        ]
    }
]   

Answer 1

创建视图模型并选择属性的一种方法。

var teams = await _context
.Teams
.Include(t => t.TeamUsers)
.ThenInclude(u => u.User)
.Select(c => new TeamViewModel
        {
            TeamID = c.TeamID,
            Name = c.Name,
            Avatart = c.Avatart,
            CreatedAt = c.createdAt,
            Users = c.TeamUsers.Select(u=>u.User).ToList()
        }).ToListAsync();

        return teams;