[CSHARP-2623] AndFilterDefinition rendering does not include the "$and" part Created: 30/May/19  Updated: 27/Oct/23  Resolved: 03/Jun/19

Status: Closed
Project: C# Driver
Component/s: Serialization
Affects Version/s: 2.8.1
Fix Version/s: None

Type: Bug Priority: Major - P3
Reporter: Yonatan Doron Assignee: Robert Stam
Resolution: Works as Designed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified


 Description   

The rendering of AndFilterDefinition is missing the $and string at the beginning:

var andFilter = Builders<Folder>.Filter.And( 
    Builders<Folder>.Filter.Where(f => f.FolderGuid == folderId),
    Builders<Folder>.Filter.Where(f => f.ParentFolderGuid == folderId))                .Render(folderSerializer, BsonSerializer.SerializerRegistry);
 
// Outputs: { "_id" : CSUUID("645624f2-35b5-4fe5-903c-7742e41d3371"), "ParentFolderGuid" : // CSUUID("645624f2-35b5-4fe5-903c-7742e41d3371") }
Console.WriteLine(andFilter); 
 
var orFilter = Builders<Folder>.Filter.Or( 
    Builders<Folder>.Filter.Where(f => f.FolderGuid == folderId),
    Builders<Folder>.Filter.Where(f => f.ParentFolderGuid == folderId))                .Render(folderSerializer, BsonSerializer.SerializerRegistry);
 
// Outputs: { "$or" : [{ "_id" : CSUUID("645624f2-35b5-4fe5-903c-7742e41d3371") }, { "ParentFolderGuid" : CSUUID("645624f2-35b5-4fe5-903c-7742e41d3371") }] }
Console.WriteLine(orFilter); 



 Comments   
Comment by Robert Stam [ 03/Jun/19 ]

This is actually by design. The $and is implied.

To the server the following two filters are equivalent:

 

{ $and : [ { x : { $gt : 0 } }, { y : { $lt : 100 } } ] }
 
{ x : { $gt : 0 }, y : { $lt : 100 } } // $and is implied

The are a few rare cases where the $and is required and the C# driver knows about those and will use an explicit $and when it is required.

 

 

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