//http://docs.mongodb.org/manual/core/aggregation-pipeline-optimization/#aggregation-pipeline-sequence-optimization
public double Sum <T>(IMongoQuery query, IMongoGroupBy fieldsGroupBy)
{
var _match = query.ToMatchDocument();
var _group = fieldsGroupBy.ToGroupDocument(MongoExtensions.GetCollectionName <T>());
var _result = Aggregate <T>(_match, _group).SingleOrDefault();
return(_result != null?Convert.ToDouble(_result.GetValue(1)) : 0);
}
public CommandResult FullTextSearch <T>(string lang, string keyword, IMongoQuery query, IMongoFields fields, int limit)
{
var _cmd = new CommandDocument
{
{ "text", MongoExtensions.GetCollectionName <T>() },
{ "language", lang },
{ "search", (keyword != "") ? keyword : "" },
{ "filter", query.ToBsonDocument() },
{ "project", fields.ToBsonDocument() },
{ "limit", limit }
};
var _result = Database.RunCommand(_cmd);
return(_result);
}
/// <summary>
/// Remove a collection type T in the database.
/// </summary>
public void Drop <T>()
{
Database.DropCollection(MongoExtensions.GetCollectionName <T>());
}
public MongoCollection <T> GetCollection <T>()
{
return(Database.GetCollection <T>(MongoExtensions.GetCollectionName <T>()));
}