MongoDB and NoRM - Querying collection against a list of parameters - mongodb

Question

I need to query a collection based on a list of parameters.
For example my model is:
public class Product
{
string id{get;set;}
string title{get;set;}
List<string> tags{get;set;}
DateTime createDate{get;set;}
DbReference<User> owner{get;set;}
}
public class User
{
string id{get;set;}
...other properties...
}
I need to query for all products owned by specified users and sorted by creationDate.
For example:
GetProducts(List<string> ownerIDs)
{
//query
}
I need to do it in one query if possible not inside foreach. I can change my model if needed

Answer 1

It sounds like you are looking for the $in identifier. You could query products like so:
db.product.find({owner.$id: {$in: [ownerId1, ownerId2, ownerId3] }}).sort({createDate:1});
Just replace that javascript array [ownerId1, ...] with your own array of owners.
As a note: I would guess this query is not very efficient. I haven't had much luck with DBRefs in MongoDB, which essentially adds relations to a non-relational database. I would suggest simply storing the ownerID directly in the product object and querying based on that.

Answer 2

The solution using LINQ is making an array of user IDs and then do .Contains on them like that:
List<string> users = new List<string>();
foreach (User item in ProductUsers)
users .Add(item.id);
return MongoSession.Select<Product>(p => users .Contains(p.owner.id))
.OrderByDescending(p => p.createDate)
.ToList();