Deployment View cannot be generated in c4plantuml when using workspace inclusion

[plgregoire]

Hi,

I'm trying to separate my workspace in multiple files but I have encountered an issue with the deployment view generation. I have put together a small example that reproduce the issue.

parent_workspace.dsl

workspace {

    model {
        softwareSystem = softwareSystem "Software System"{
            database = container "Core Container" "" "Database"
        }
    }
}

workspace.dsl

!include parent_workspace.dsl
workspace {

    model {
        !ref softwareSystem {
            service = container "service"
        }
        service -> database "Reads from"


        deploymentEnvironment "OnPremise" {
            deploymentNode "Database Server" {
                containerInstance database
            }

            deploymentNode "Other server"{
                containerInstance service
            }
        }
    }
    
    views {
        deployment * OnPremise "OnPremise"  {
            include *
        }
    }
}

The generation will produce this error message

Exporting workspace from workspace.dsl
 - loading workspace from DSL
 - using C4PlantUMLExporter
java.lang.NullPointerException: Cannot invoke "com.structurizr.model.Relationship.getTags()" because the return value of "com.structurizr.model.Model.getRelationship(String)" is null
        at com.structurizr.export.plantuml.C4PlantUMLExporter.tagsOf(C4PlantUMLExporter.java:270)
        at com.structurizr.export.plantuml.C4PlantUMLExporter.writeRelationship(C4PlantUMLExporter.java:306)
        at com.structurizr.export.AbstractDiagramExporter.writeRelationships(AbstractDiagramExporter.java:553)
        at com.structurizr.export.AbstractDiagramExporter.export(AbstractDiagramExporter.java:462)
        at com.structurizr.export.AbstractDiagramExporter.export(AbstractDiagramExporter.java:439)
        at com.structurizr.export.AbstractDiagramExporter.export(AbstractDiagramExporter.java:71)
        at com.structurizr.cli.ExportCommand.run(ExportCommand.java:181)
        at com.structurizr.cli.StructurizrCliApplication.run(StructurizrCliApplication.java:36)
        at com.structurizr.cli.StructurizrCliApplication.main(StructurizrCliApplication.java:81)

One last thing to mention.
If the service and the database were in the same deploymentNode then it would work

[simonbrowndotje]

!include simply inlines the referenced file, so you have two workspace definitions, which is likely to be causing the problem you’re seeing. See https://github.com/structurizr/dsl/blob/master/docs/language-reference.md#includes for more.

[plgregoire]

Oh! So I should have something that looks more like this.

parent_workspace.dsl

model {
    softwareSystem = softwareSystem "Software System"{
        database = container "Core Container" "" "Database"
    }
}

workspace.dsl

workspace {

    !include parent_workspace.dsl
    
    model {

        !ref softwareSystem {
            service = container "service"
        }
        service -> database "Reads from"


        deploymentEnvironment "OnPremise" {
            deploymentNode "Database Server" {
                containerInstance database
            }

            deploymentNode "Other server"{
                containerInstance service
            }
        }
    }
    
    views {
        deployment * OnPremise "OnPremise"  {
            include *
        }
    }
}

It is strange that I had no problem with the other diagram types and only with the deployment. Anyway, It works with this syntax.
Thank you for you help!