Too Many Left Outer Joins in Entity Framework 4?
- by Adam
I have a product entity, which has 0 or 1 "BestSeller" entities. For some reason when I say:
db.Products.OrderBy(p = p.BestSeller.rating).ToList();
the SQL I get has an "extra" outer join (below). And if I add on a second 0 or 1 relation ship, and order by both, then I get 4 outer joins. It seems like each such entity is producing 2 outer joins rather than one. LINQ to SQL behaves exactly as you'd expect, with no extra join.
Has anyone else experienced this, or know how to fix it?
SELECT
[Extent1].[id] AS [id],
[Extent1].[ProductName] AS [ProductName]
FROM [dbo].[Products] AS [Extent1]
LEFT OUTER JOIN [dbo].[BestSeller] AS [Extent2] ON [Extent1].[id] = [Extent2].[id]
LEFT OUTER JOIN [dbo].[BestSeller] AS [Extent3] ON [Extent2].[id] = [Extent3].[id]
ORDER BY [Extent3].[rating] ASC
