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Adding a node does not work [message #1861393]

Tue, 10 October 2023 14:28

Eclipse User

Hello all,

let me write it first: Thanks to the authors for the excellent Sirius!

And now I need your support. Attached is my metamodel and my definition of "Node Creation Server". Most things do work, but as a result I get the node with a red cross. What am I doing wrong?

EDIT and additional information:

According to another post "The red cross on the graphical element means the semantic element behind has been removed." In my case it means that there is no correct instance creation, right?

According to
https://eclipse.dev/sirius/doc/specifier/general/Model_Operations.html#create_instance "The reference name must correspond to a valid containment reference for the context element of the operation, otherwise the newly created object will not be properly integrated into the semantic model." So I should create the instance inside the "asset" container first and connect it to the "contains" reference or just set the "isLocatedIn" reference to the container that was clicked. Am I right on that? Unfortunately this does not work:

1. Click on a container
2. Change context to "System"
3. Create instance within the "asset" containment
4. Set the "isLocatedIn" reference to the clicked container

Why does it not work? Maybe I'm making a basic mistake somewhere. Can you help me please?

Kind regards

Attachment: CreatingNode.jpg
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Attachment: metamodel.png
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[Updated on: Wed, 11 October 2023 12:35] by Moderator

Re: Adding a node does not work [message #1861441 is a reply to message #1861393]

Thu, 12 October 2023 09:51

Eclipse User

You're right that you should create the instance inside the "asset" container first, so that the newly created element is properly attached to the rest of the model.
The first "Create Instance" is incorrect, as the reference name given ("contains"), despite its name, is not a containment reference.

The browse expression on the second "Change Context", i.e. "aql:m::System" is incorrect. It refers to a type (the m::System EClass), which it should return return the model element instance to "go to".

The steps you mention look right (except the issue above), except "Set the "isLocatedIn" reference to the clicked container". The "isLocatedIn" relation is not between an asset and its container System, but with a Vlan. So it's more like "Set the "isLocatedIn" reference to the one of the clicked container's Vlan".

Re: Adding a node does not work [message #1861480 is a reply to message #1861441]

Sun, 15 October 2023 07:28

Eclipse User

Dear Pierre-Charles,

thank you very much. Now everything is working as expected. I'm changing the context using aql:self.eContainer(), creating the instance of server and setting isLocatedIn to var:container.

Afterwards I created an Update Site like described here https://wiki.eclipse.org/Sirius/Tutorials/UpdateSiteTutorial#Test_the_Update_Site, but I cound not select a Viewport. I figured out that the Model File Extension was set to *, so I changed it. I created a new future and update project but still cannot see any viewports to select. The metamodel is set correctly in the diagram description metamodel property.

Any ideas?

Kind regards

Re: Adding a node does not work [message #1861532 is a reply to message #1861480]

Tue, 17 October 2023 13:51

Eclipse User

To be more precise. I create a new modeling project. Then I add a sample model that appears in the selection box with the previously defined extension. So all is fine. But in my project I can neither select a viewport nor define a new representation, see screenshots. What is wrong?

index.php/fa/43592/0/

I would be very happy about support.

Kind regards

Attachment: noViewport.png
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Attachment: noRepresentation.png
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