How to register own Mapper?

[thedomeffm]

Probably an issue will receive some support..?

Discussed in #816

^{Originally posted by thedomeffm September 11, 2024}
We want to use Guid as our primary key.

This fails because of: MappingFailedException Cannot map record to type Skill because the record does not contain a value for the property 'nodeId'.

What are we doing wrong?

using Neo4j.Driver.Mapping;

// ...

public class Skill
{
    [MappingSource("nodeId")]
    public Guid nodeId { get; set; }
    
    [Required]
    [MappingSource("name")]
    public string name { get; set; };
}

public class SkillRepository {
    // ...

    public async Task<Skill> Upsert(Skill skill) { /* ...  */ }

    public async Task<Skill> GetById(Guid nodeId)
    {
        StringBuilder queryBuilder = new StringBuilder("MATCH (skill:Skill {nodeId: $nodeId}) RETURN skill");
    
        IList<IRecord> result = await _neo4JDriverService.ExecuteReadQueryAsync(queryBuilder.ToString(), new { nodeId = nodeId.ToString() });
    
        RecordObjectMapping.Register(new GuidMapper()); // <-- Is this correct?

        RecordObjectMapping.RegisterProvider(new GuidMappingProvider()); // or this..?
    
        return result.Single().AsObject<Skill>();
    }
}

public class GuidMapper : IRecordMapper<Guid>
{
    public Guid Map(IRecord record)
    {
        // does not work:
        return Guid.Parse(record.ToString());
    }
}

public class GuidMappingProvider : IMappingProvider
{
    public void CreateMappers(IMappingRegistry registry)
    {
        registry
            .RegisterMapping<Skill>(
                builder =>
                {
                    builder
                        .UseDefaultMapping()
                        // does not work:
                        .Map(m => m.nodeId, record => Guid.Parse(record.Values["nodeId"].As<string>()))
                        // does not work:
                        .Map(m => m.nodeId, "nodeId", EntityMappingSource.Property, o => Guid.Parse(o.As<string>()), true)
                    ;
                });
    }
}
```</div>

[RichardIrons-neo4j]

Hi there. I've responded to your discussion about this. There is indeed a bug.