[CSHARP-4688] Calling queryable.First when queryable is of type IMongoQueryable<T> doesn't add { $limit : 1 } stage to pipeline Created: 23/Jun/23 Updated: 29/Jun/23 Resolved: 29/Jun/23 |
|
| Status: | Closed |
| Project: | C# Driver |
| Component/s: | LINQ3 |
| Affects Version/s: | None |
| Fix Version/s: | 2.21.0 |
| Type: | Improvement | Priority: | Unknown |
| Reporter: | Robert Stam | Assignee: | Robert Stam |
| Resolution: | Done | Votes: | 0 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Documentation Changes: | Not Needed |
| Documentation Changes Summary: | 1. What would you like to communicate to the user about this feature? |
| Description |
|
When `queryable` is of type `IMongoQueryable<T>` the compiler resolves the call to `queryable.First()` to the overload found in `IAsyncCursorSourceExtensions` instead of to `Queryable.First`. Compiler rules for resolving overloads are rather hard to understand and in this case it resolves to an unexpected overload. The effect of this is that the query sent to the server does not have the desired ` { $limit : 1 }` stage. A similar situation exists for many other extension methods in `IAsyncCursorSourceExtensions` that have the same name as extension methods in `Queryable` or `MongoQueryable`. |
| Comments |
| Comment by Githook User [ 29/Jun/23 ] |
|
Author: {'name': 'rstam', 'email': 'robert@robertstam.org', 'username': 'rstam'}Message: stage to pipeline. |