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[QVTO] How to add children to a model element? [message #462434]

Sun, 02 August 2009 14:37

Eclipse User

Originally posted by: formatzeh.gmx.de

I created my own metamodel and now I want to do some m2m transforamtions
for the instances. For example an element of Type "View" can have some
children of type "ViewTransition". How do I do this? My try was the
following:

mapping CMM::Layout::addView(inout layoutModel : CMM::NavigationModel) :
CMM::View
{
result.name := self.name + "View";
result.layout := self;
result.allSubobjects() += object ViewTransition{};
}

But this doesn't work because I get the following error message:
Cannot assign to this expression since it is not an lvalue

But I don't know what this message means. What is an lvalue and how do I
add some children?

best regards
Gilbert

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Re: [QVTO] How to add children to a model element? [message #462528 is a reply to message #462434]

Sun, 02 August 2009 14:49

Eclipse User

Originally posted by: formatzeh.gmx.de

I got it. Sorry, but I ignored the OrderedSet elements belonging to my
metamodel. I always only looked at the general methods like allSubobjects().

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