[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?
2. Would you like the user to see examples of the syntax and/or executable code and its output?
3. Which versions of the driver/connector does this apply to?


 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: CSHARP-4688: Calling queryable.First when queryable is of type IMongoQueryable<T> doesn't add

{ $limit : 1 }

stage to pipeline.
Branch: master
https://github.com/mongodb/mongo-csharp-driver/commit/6c20aa7b918978ee4d40d41a137c472f5a4edef7

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