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Problem to instantiate objects of a specific type from another of the same type [message #1827523]

Sun, 17 May 2020 09:35

Léo Cauvin

Messages: 12
Registered: April 2020

Junior Member

Hi,
You can see my metamodel in attachments, the problem is to create a new object of type "Node" from the Node object already created from "Authentifier". As we can see in nodeProperties.png, objects are successfully created and connected to the first Node object, but nothing appears on the diagram. So I can't even change the name of each Node object, and I can't connect them to any other objects. Do someone know how can I make them appear on the diagram ? The three other screenshots show you how I did to create a node Node.
Regards

Léo

Attachment: metamodel.jpg
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Attachment: nodeProperties.png
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Attachment: general.png
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Attachment: advanced.png
(Size: 32.17KB, Downloaded 38 times)
Attachment: createInstance.png
(Size: 33.67KB, Downloaded 41 times)

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Re: Problem to instantiate objects of a specific type from another of the same type [message #1827544 is a reply to message #1827523]

Mon, 18 May 2020 05:42

Avi Shaked

Messages: 130
Registered: October 2019

Senior Member

Since you say that the node is created successfully, I actually suspect the problem is in the node representation. Perhaps its candidates are not well specified. Can you share your definition for the node element in the diagram (not the create node, but the node itself)?

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Re: Problem to instantiate objects of a specific type from another of the same type [message #1827560 is a reply to message #1827544]

Mon, 18 May 2020 09:32

Léo Cauvin

Messages: 12
Registered: April 2020

Junior Member

Hi,
Here is the representation of my Node (very simple), nothing in other tabs, and nothing special except a feature:name as label in the Square light_orange properties. But I don't think this is the problem here because one objet Node is correctly created on the diagram (the one from Authentifier).
Could it come from the relation between an object Node and itself ?
Thanks for your answer.

Attachment: NodeRepresentation.png
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Re: Problem to instantiate objects of a specific type from another of the same type [message #1827570 is a reply to message #1827560]

Mon, 18 May 2020 13:58

Avi Shaked

Messages: 130
Registered: October 2019

Senior Member

I am not sure but I think the problem is with the relationship between the node and itself in the metamodel (which you marked in red). It should be a composition relationship and not a bidrectional relationship in order to have the new node under an existing node (if this is what you meant by create a new object of type "Node" from the Node object already created). Anyway, I think it is better to use the composition relationship instead of 1 parent to multiple children bi-directional relations.

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