multi map

gistfile1.cs

cnn.QueryMultiple<Table<Order>,Table<OrderLine>,Order>(
@"select * from Orders
select * from OrderLine", (orders, lines) => 
{
   var map = lines.ToDictionary(line => line.OrderId);
   foreach(var order in orders)
   {
      order.Lines = map[o.Id];
      yield return order;
   }
});


// another option, infer Table for single: 

cnn.QueryMultiple<Table<Order,User>,OrderLine,Order>(
@"select * from Orders 
left join Users u on u.Id = OwnerId
select * from OrderLine", (orders, lines) => 
{
   var map = lines.ToDictionary(line => line.OrderId);
   foreach(var order in orders.Map((o,u) => {o.Owner = u; return o;}))
   {
      order.Lines = map[o.Id];
      yield return order;
   }
});


// Same code today 

grid = cnn.QueryMultiple(
@"select * from Orders 
left join Users u on u.Id = OwnerId
select * from OrderLine"); 

var orders = grid.Read<Order,User,Order>((o,u) => {o.Owner = u; return o;}).ToList();
var map = grid.Read<OrderLine>().ToDictionary(line => line.OrderId);

foreach(var order in orders)
{
  order.Lines = map[order.Id];
}

@JasonPunyon isn't he trying to avoid chaining in his revision?

@jcolebrand: He hasn't told me so I wouldn't know. I just followed a tweet here :)

@JasonPunyon me too! ;)