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Hi... Does anyone tried to *extend* the datahub entities ? We are able to easily extend the gms by simply putting pdl files. But for graphql-core, we are kinda of confused on where to start adding custom code. Some inputs will really help. thanks

Hi <@U02K720EFM1>,
Here is a quick doc about graphql core  along with some steps to extend an entity - <https://datahubproject.io/docs/datahub-graphql-core/>
Adding an Aspect to an Entity (GraphQL)
1. Edit `entity.graphql` file inside `datahub-graphql-core` to include the new GraphQL Schema Types for your new Aspect (manually). Each Metadata Entity has its own top-level GraphQL Type (e.g. Dataset, Chart, Dashboard..). Aspects are optional fields associated with these entities.
2. Run `./gradlew datahub-graphql-core:build` to generate strongly typed Java objects corresponding to schemas in Step 1.
3. Edit `&lt;Entity&gt;SnapshotMapper.java` to provide a mapping from the Metadata Service Models to the GraphQL Model defined in Step 1. For example, see DatasetSnapshotMapper.java.
4. Build and deploy `metadata-service`  again: `./gradlew metadata-service:war:build` and then `dev.sh`


Thanks <@U02AYK6RSPP> for your inputs. It really really helped us to move forward

Now we are able to see our new entity in home page. When we click on it, it is making browse call to the gms server which is resulting in empty array response. We are seeing any error logs also.
We created new EntityType with `browse` method and registered it `GmsGraphQLEngine` in line: <https://github.com/linkedin/datahub/blob/master/datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/GmsGraphQLEngine.java#L242> . When we click on browser, it is making this browse call, but the value is empty array.  *Do we need to configure extra for browse feature ?*

Also, what is the role of these files <https://github.com/linkedin/datahub/tree/master/metadata-service/restli-api/src/main/idl> ? We have not modified it.