Relations are not loaded, when the Start- and EndNode do not directly implement the interface the relation requires

[Ph3n1x]

Expected Behavior

On load, all relations and their nodes should be loaded (depending on the query depth of course)

Current Behavior

On load, only those, which directly implement IdHolder are loaded

Possible Solution

As a workaround, I could add IdHolder to the implements part of every node class.
A solution would maybe require to check recursively for all super classes/interfaces of the classes.

Steps to Reproduce (for bugs)

Here is the link to the very basic example: https://github.com/Ph3n1x/neo4j-sdn-ogm-issue-report-template/tree/master/issue-491

1. Execute the test. It fails, although the data is persisted right before and if you check the database, the nodes and relation are also existing
2. To workaround this issue, one could let Group directly implement IdHolder (although it already does through GroupInterface). When you then execute the test again, it works like a charm (see CHECKME in Group)

Context

I am working a lot with interfaces and interface inheritance. My relations are therefor very generic with the IdHolder beeing the main interface of all my nodes.

Your Environment

• OGM Version used: 3.1.0
• Java Version used: 1.8 and 1.9
• Neo4J Version used: 3.4.0
• Bolt Driver Version used (if applicable): 3.1.0
• Operating System and Version: Ubuntu 18.04
• Link to your project: https://github.com/Ph3n1x/neo4j-sdn-ogm-issue-report-template/tree/master/issue-491

[meistermeier]

Thanks for reporting this. As you can see there is already a pending PR to solve the problem. There was no stepping through the interface hierarchy as you have noticed.