CODEWITHSUNDEEP
c#mongodb
mare
mare

Reputation: 13083

MongoDb 2.0 C# driver not creating values for IDs on inserts

It says here (http://mongodb.github.io/mongo-csharp-driver/2.2/reference/bson/mapping/#id-generators) that the driver should use one of the builtin ID generators to generate a new ID for properties ID, id, _id (convention).

I have a model with

public string Id { get;set; }

and the automatic ID generation is not happening. Inserted document has an ID of null.

Snippet from my repository code:

    public void Save<TEntity>(TEntity item) where TEntity : class, new()
    {
        var collection = GetCollection<TEntity>();
        collection.InsertOne(item);
    }

Upvotes: 1

Views: 1071

Answers (1)

mare
mare

Reputation: 13083

After further troubleshooting I got this working.

Had to put attribute [BsonId] set to StringObjectIdGenerator to Id properties.

[BsonId(IdGenerator = typeof(StringObjectIdGenerator))]

The docs at http://mongodb.github.io/mongo-csharp-driver/2.2/reference/bson/mapping/#id-generators are certainly misleading or not clear enough

Some of these Id generators are used automatically for commonly used Id types: GuidGenerator is used for a Guid ObjectIdGenerator is used for an ObjectId StringObjectIdGenerator is used for a string represented externally as ObjectId

I've opened an issue with MongoDb JIRA tracker and I'll post their reply here if they provide any insight into that.

Upvotes: 1

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