5 Auto Increment Id Generator

Auto-Increment Id Generator

The MongoBasic library allows you to use auto-incremented id generation, if you want. The id generation strategy can be specified per class mapping. Here is an example:

public class Vehicle
{
    //we need to have an Id property of type int or long
    public long Id { get; set; }
    public string Model { get; set; }
    public string Make { get; set; }
}
```

```c#
public class VehicleMap:MongoClassMap<Vehicle>
{
    //add constructor with id generator parameter
    public VehicleMap(IIdGenerator idGenerator):base(idGenerator)
    {
        //leave constructor body empty, just pass the idGenerator to the
        //base class constructor
    }

    protected override void MapEntity(BsonClassMap<Vehicle> cm)
    {
        //set idGenerator to the one we passed in the constructor
        cm.MapIdField(x => x.Id).SetIdGenerator(this.IdGenerator);
        cm.AutoMap();
    }
}

public class MySessionMongoFactory : AbstractMongoSessionFactory
{
    public MySessionMongoFactory(MongoSessionFactoryConfig mongoSettings) : base(mongoSettings)
    {
    }

    protected override void AfterSessionFactoryInitialized(MongoDatabase mongoDatabase)
    {
        //instantiate VehicleMap class with correct constructor
        //the AutoIncrementIdGenerator will use long type for id fields, for the 'Vehicles' collection
        RegisterClassMap(new VehicleMap(new AutoIncrementIdGenerator<long>(mongoDatabase, "Vehicles")));
    }
}