Question

我试图根据用户的两个输入找到一个MongoDB文档。这是我的榜样：

public async Task RemoveAdminRole(string userId, string groupId) { 
    var idFilter = Builders<Group>.Filter.Eq(group => group._id, groupId);
    var roleFilter = Builders<Group>.Update.PullFilter(group => group.Roles, role => role.UserId == userId);
    var roleFilter2 = Builders<Group>.Update.PullFilter(group => group.Roles, role => role.Role == "ADMIN");

    var update = roleFilter & roleFilter2;

    await this.DataContext.MongoCollection.UpdateOneAsync(idFilter, update);
}

基本上我想要做的就是移除/拉动元素＆＃34;角色＆＃34;位于Group和role.Role == "ADMIN"的{{1}}内。我收到了错误：

运营商＆＃39;＆amp;＆＃39;不能应用于类型＆＃39; UpdateDefinition＆lt; Group＆gt;＆＃39;的操作数。和＆＃39; UpdateDefinition＆lt; Group＆gt;＆＃39;

我如何创建多个role.UserId == userId（或类似的），以便根据我的两个输入删除特定元素？

Answer 1

您可以添加第二个，如下所示：

var roleFilter = Builders<Group>.Update
    .PullFilter(group => group.Roles, role => role.UserId == userId)
    .PullFilter(group => group.Roles, role => role.Role == "ADMIN");

根据多个条件删除/拉出一个文档

1 个答案: