是否一个数组包含任何值在另一个数组Mongodb使用c#

Question

{
"objects": [
{
"id": 123,
"tracking_datas": [
{
"id": 1,
"polygons": [1,3]
},
{
"id": 2,
"polygons": [3]
},
{
"id": 3,
"polygons": [1,2]
}
]
}
]
}

我有一个json文件如上所述。在我的NetCore项目中有一个模型可以满足这个json。我想获得包含多边形的对象，我在mongodb的帮助下确定。我怎么能做到这一点与c# mongo数据库?

例如，我有一个引用数组requiredPolygons:[1,2]，我想在json中的对象的跟踪数据中获得包含这些多边形id的数据。预期结果如下:

{
"objects":
[
{
"id": 123,
"tracking_datas":[
{
"id": 1,
"polygons": [1,3]
},
{
"id": 3,
"polygons": [1,2]
}
]
}
]
}

Answer 1

public class Test
{
public ObjectId Id { get; set; }
public IEnumerable<Object> objects { get; set; }
[BsonExtraElements]
public BsonDocument UnmappedFields { get; set; } // I'm not sure why it's required, something wrong with mapping configuration,
// but it's a separate question
}
public class Object
{
public int id { get; set; }
public IEnumerable<TrackingData> tracking_datas { get; set; }
}
public class TrackingData
{
public int id { get; set; }
public IEnumerable<int> polygons { get; set; }
[BsonExtraElements]
public BsonDocument UnmappedFields { get; set; } // I'm not sure why it's required, something wrong with mapping configuration,
// but it's a separate question
}
var json = @"{
""objects"": [
{
""id"": 123,
""tracking_datas"": [
{
""id"": 1,
""polygons"": [1,3]
},
{
""id"": 2,
""polygons"": [3]
},
{
""id"": 3,
""polygons"": [1,2]
}
]
}
]
}";
var client = new MongoClient();
var db = client.GetDatabase("so_test");
var coll = db.GetCollection<BsonDocument>("coll");
coll.InsertOne(BsonDocument.Parse(json));
var ids = new[] { 1, 2 };
var typedColl = db.GetCollection<Test>("coll");
var result = typedColl
.Aggregate()
.Project(p =>
new Test
{
Id = p.Id,
objects = p.objects.Select(o =>
new Object
{
id = o.id,
tracking_datas = o.tracking_datas.Where(t => t.polygons.Any(p=>ids.Contains(p)))
})
}
)
.ToList();

Answer 2

给你:

db.collection.find({
"objects.tracking_datas.polygons": {
$in: [
1,
2
]
}
})

https://mongoplayground.net/p/MDlIV3YPkZB