linq - RavenDb 4：检查字符串数组中的字符串是否存在于不同的字符串数组中

Question

我正在尝试根据用户角色过滤我的活动。只允许经理查看包含该角色的活动Manager。请参阅下面的详细信息。

数据：

var user = new User
{
    Roles = [
        "Manager"
    ]   
}

var activities = new List<Activity>
{
    new Activity
    {
        Description = "My First Activity",
        Roles = [
            "Admin",
            "Manager"
        ]
    },  
    new Activity
    {
        Description = "My Second Activity",
        Roles = [
            "Admin"
        ]
    },  
    new Activity
    {
        Description = "My Third Activity",
        Roles = [
            "Manager",
            "Client"
        ]
    },
}

过滤活动的查询

 var filtered = await context.Query<Activity>()
                    .Where(x => x.Roles.Any(y => user.Roles.Contains(y)))
                    .ToListAsync();

过滤后的预期结果：

[
    {
        new Activity
        {
            Description = "My First Activity",
            Roles = [
                "Admin",
                "Manager"
            ]
        }
        new Activity
        {
            Description = "My Third Activity",
            Roles = [
                "Manager",
                "Client"
            ]
        },
    }
]

查询错误

System.InvalidOperationException : Can't extract value from expression of type: Parameter

我收到一个错误，所以很明显我做错了什么。这是正确的方法还是有更好的方法？

Answer 1

这需要 RavenDB 在查询期间进行计算，试试这个，而不是：

.Where(x => x.Roles.In(user.Roles))（可能需要为In扩展方法添加 using 语句Raven.Client.Linq，IIRC）。