MongoDb / C# filter and get all subdocuments

Question

I\'m having difficulties querying a Mongo-DB collection.

The document I\'m using

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

    pu         


        

Answer 1

This should get you going:

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();

The driver will translate this into:

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

For the case-insensitive version, there will be a the option to use $regex at some stage in the future (see https://jira.mongodb.org/browse/SERVER-11947). However, what you can do just now is use 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();