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mongodb/c过滤并获取所有子文档

mongodb.driver mongodb c#

Daniel Haefliger · 技术社区 · 8 年前

我使用的文档

public class Customer
{
    public ObjectId Id { get; set; }

    public int CustomerId { get; set; }

    public List<Address> Addresses { get; set; }
}

public class Address
{
    public string Name { get; set; }
}

{
    CustomerId: 2,
    Addresses: [
        {
            Name: "Daniel"
        },
        {
            Name: "Eric"
        },
        {
            Name: "Dan"
        }
        ]
}

var mdb = mongoClient.GetDatabase("test");
var collection = mdb.GetCollection<WebApi>("Customer");
var builder = Builders<Customer>.Filter;
var searchTerm = "Dan";

当像这样查询时,它可以工作,但它保存所有地址:

var filter = builder.And(builder.Eq("InstallationId", 2),
                         builder.Regex("Addresses.Name", new BsonRegularExpression(".*" + searchTerm + ".*", "i")))
var result = collection.Find(filter).FirstOrDefault();

[
    {
        Name: "Daniel"
    },
    {
        Name: "Dan"
    }
]

{
    CustomerId: 2,
    Addresses: [
        {
            Name: "Daniel"
        },
        {
            Name: "Dan"
        }
        ]
}

collection.AsQueryable().Where(x => x.CustomId == 2).SelectMany(x =>
                x.Addresses.Where(a => a.Name.IndexOf(searchTerm, StringComparison.InvariantCultureIgnoreCase) >= 0).ToList();

1 回复 | 直到 8 年前

dnickless 8 年前

这应该让你去:

var result = collection
    .Aggregate()
    .Match(c => c.CustomerId == 2)
    .Project(c => new
        {
            c.CustomerId,
            Addresses = c.Addresses.Where(a => a.Name.IndexOf(searchTerm) != -1)
        })
    .ToList();

db.Customer.aggregate([{
    $match: { CustomerId: 2 }
}, {
    $project: {
        CustomerId: "$CustomerId",
        Addresses: {
            $filter: {
                input: "$Addresses",
                as: "a",
                cond: {
                    $ne: [ { $indexOfBytes: [ "$$a.Name", "Dan" ] }, -1 ]
                }
            }
        },
        _id: 0
    }
}])

https://jira.mongodb.org/browse/SERVER-11947 ToUpper()

var result = collection
    .Aggregate()
    .Match(c => c.CustomerId == 2)
    .Project(c => new
        {
            c.CustomerId,
            Addresses = c.Addresses.Where(a => a.Name.ToUpper().IndexOf(searchTerm.ToUpper()) != -1)
        })
    .ToList();

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