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Scope uninitialized in Query Results [message #1836181]

Wed, 23 December 2020 09:33

Thuy Nguyen

Messages: 4
Registered: December 2020

Junior Member

I am applying the guide in the "GETTING STARTED WITH VIATRA" tutorial (https://www.eclipse.org/viatra/documentation/tutorial.html) to writing a query for my model instances.

About my model: I created a metamodel in metamodel.ecore file, generated some instances, and save these instances in a model.xmi file.

At step 3.1.2. Evaluate Queries in the Query Results View, I cannot load models and queries using the Query Results View because the scope is uninitialized. [1]: index.php/fa/39598/0/

I would like to ask how to initialize the Query Scope in my case.

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Re: Scope uninitialized in Query Results [message #1836192 is a reply to message #1836181]

Wed, 23 December 2020 16:59

Zoltan Ujhelyi

Messages: 392
Registered: July 2015

Senior Member

Hi Thuy,

loading queries into the Query Results view requires two separate steps: at first, you have to initialize the query scope (by selecting a model file) and then can the queries be loaded. In section 3.1.2 the required steps are documented as follows:

Quote:

1. Open our example instance model (/org.eclipse.viatra.examples.cps.instances/example.cyberphysicalsystem)
2. Make sure "ReteEngine" is selected in the toolbar of the Query Results view
3. then press the 'Load model from active editor' (first button on the toolbar)
4. Open the query specification (vql file)
5. then press the 'Load queries from the active editor' button

Here steps 1-3 are responsible for initializing the scope, and 4-5 for loading the queries. Based on your screenshot my guess is that you have not executed successfully step 1-3.

Best regards,
Zoltán

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