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checking one of the references can be created [message #1769945]

Sun, 06 August 2017 18:37

Banafsheh A

Messages: 272
Registered: July 2016

Senior Member

Hi,

When I create an instance of "Families" metamodel, It is not possible to e.g., a Member be both (Family) mother and (Family) father or mother and daughter or etc. I want to know which property in its metamodel causes that?

I attached the metamodel and the model.

Attachment: f.model
(Size: 0.27KB, Downloaded 34 times)
Attachment: Families.ecore
(Size: 2.10KB, Downloaded 32 times)
Attachment: Screen Shot 2017-08-06 at 11.05.26 PM.png
(Size: 18.15KB, Downloaded 39 times)

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Re: checking one of the references can be created [message #1769957 is a reply to message #1769945]

Mon, 07 August 2017 05:55

Ed Merks

Messages: 29650
Registered: July 2009

Senior Member

All the references of Family are containment references. Any instance can only be in at most one containment reference; adding an instance to a containment reference will remove it from any other containment reference where it's currently contained.

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Re: checking one of the references can be created [message #1769963 is a reply to message #1769957]

Mon, 07 August 2017 06:57

Ed Willink

Messages: 6110
Registered: July 2009

Senior Member

Hi

It is very unfortunate that the families and Families2Persons transformation have become standard intro examples.

The containment perverseness of the Families model is very confusing. (There is no actual specification, so it isn't actually a bug; just an offense against common sense.)

Regards

Ed Willink

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