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[AQL] allInstances operator not available [message #1810893]

Wed, 21 August 2019 08:14

Eclipse User

Hi,

I have a hard time using the allInstances() operator for AQL (in "normal" OCL, for example in the ecore metamodel this works fine for me). In a Sirius editor I try to select all instances of a specific class via AQL. The documentation of https://www.eclipse.org/acceleo/documentation/ indicates that something similimar to the following should be possible:

aql:basicfamily::Women.allInstances()

Unfortunately, this does not work. I have tried several variants of this but did not succeed. Is there something I am missing? I simply want to grep all instances of the class "Women", which are in my model.

Best regards and thank you in advance,
Nico

Re: [AQL] allInstances operator not available [message #1811004 is a reply to message #1810893]

Fri, 23 August 2019 09:19

Eclipse User

Hi,

A bugzilla has been raised about this issue: https://bugs.eclipse.org/bugs/show_bug.cgi?id=487946
You can use this expression on the root object of your model instead: EObject.eAllContents(EClass) : Sequence{EObject}

Note that might cause important performance issues. It is really recommended to avoid requests that will iterate over the whole model. It is preferable to use more specific requests if you know the metamodel.

Regards,

Florian

Re: [AQL] allInstances operator not available [message #1811174 is a reply to message #1811004]

Wed, 28 August 2019 03:31

Eclipse User

Hello Florian,

thank you for your response. I implemented a solution similar to your suggestion. I agree you should avoid anything like allInstances() at all costs ;)

Best regards,
Nico

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