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AQL: Recursive selection [message #1801518]

Mon, 21 January 2019 10:37

Eclipse User

Hi,

I have an Item with can have properties, which also can have properties.
I tried to get them in an elegant way recursively, but it does not work, but i don't want to use a service, since i will need this scenario quite often. It seems i overlooked a concept.

NAIVE Approach:
aql: self.properties + self.properties.subProperties + self.properties.subProperties.subProperties + self.properties.subProperties.subProperties.subProperties ....

How can i implement this?

Thanks,
Laurens

[Updated on: Wed, 23 January 2019 10:31] by Moderator

Re: AQL: Recursive selection [message #1801679 is a reply to message #1801518]

Thu, 24 January 2019 11:32

Eclipse User

Hello Laurens,

Why don't you want to use a Java service?
In which case do you want to do it? Is it in a mapping definition?
Maybe the solution is provided by Sirius and not by AQL. So, to give you the best answer, I need to know your need and in which case Sirius you should use this.

Thanks.

Regards,

Re: AQL: Recursive selection [message #1801931 is a reply to message #1801679]

Tue, 29 January 2019 10:23

Eclipse User

Thank you for your help so far.

I want to create node for all contained elements in a tree-like diagram.

This seems to be a common use-case, but I miss the concept in the documentation.

Attachment: Screenshot at Jan 29 16-20-57.png
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Re: AQL: Recursive selection [message #1801937 is a reply to message #1801931]

Tue, 29 January 2019 11:02

Eclipse User

Hello,

I think that in your metaclass, you should add an EOperation getAllProperties. In its implementation you have a recursive method that look for properties, sub-properties etc. This way in your odesign, you will just need to call "aql: self.getAllProperties".

Regards,
Steve

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