c# - 按 id 从 mongodb 2.4 版的子文档中删除

Question

这是我的文件

Post{
  "_id" : 1,
  "Code" : CSUUID("ba22a2a3-e6b5-4ce6-a3ad-20e5196cca46"),
  "Zip" : 123456,
  "Text" : "Hello",
  "Tags" : [{
      "_id" : 1,
      "Tag" : "Tag8"
    }, {
      "_id" : 2,
      "Tag" : "Tag9"
    }, {
      "_id" : 3,
      "Tag" : "Tag10"
    }]
}

我需要在 C# 中通过 id 删除其中一个“标签”。例如:delete from post where tag.id = 2

Answer 1

MongoDB.Bson version : 2.0.1.27

MongoDB.Driver version :2.2.0.262

MongoDB.Driver.Code version :2.2.0.262

const int id = 1;
var pull = Builders<Post>.Update.PullFilter(x => x.Tags, a => a.Id == id);
var filter1 = Builders<Post>.Filter.And(Builders<Post>.Filter.Eq(a => a.Id, 1), Builders<Post>.Filter.ElemMatch(q => q.Tags, t => t.Id == id));
collection.UpdateOneAsync(filter1, pull);