Adding a link object
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    Often, when you add to an association with a link class, you want to do things with the created link object.
    Often, when you add to an association with a link class, you want to do things with the created link object.


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      self.Flights.add(aFlight);  
      self.Flights.add(aFlight);  
      self.Bookings->select(b | b.Flight = aFlight)->first
      self.Bookings->select(b | b.Flight = aFlight)->first
    There is an operator [[OCLOperators addReturnIndexOf0|addReturnIndexOf0]] that adds the Flight - and returns the zero based index of Booking.
    There is an operator [[Documentation:OCLOperators addReturnIndexOf0|addReturnIndexOf0]] that adds the Flight - and returns the zero based index of Booking.
      self.Bookings.at0(self.Flights.addReturnIndexOf0(aFlight)).AttributeOnBooking
      self.Bookings.at0(self.Flights.addReturnIndexOf0(aFlight)).AttributeOnBooking


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    Note! From the '''Booking''' object, it's only '''one''' Person object in the association. Hence, '''Person''', not '''Persons'''
    Note! From the '''Booking''' object, it's only '''one''' Person object in the association. Hence, '''Person''', not '''Persons'''


    See also: [[Training:Association classes|Association classes]]
    '''See also:''' [[Training:Association classes|Association classes]]
    [[Category:UML]]
    [[Category:UML]]
    {{Edited|July|12|2024}}
    {{Edited|July|12|2025}}

    Latest revision as of 05:16, 10 February 2025

    This page was created by Lars.olofsson@mdriven.net on 2018-10-18. Last edited by Stephanie@mdriven.net on 2025-02-10.

    Often, when you add to an association with a link class, you want to do things with the created link object.

    Do this:

    Association object.png

    Add a method to either of the "main" classes with content similar to this: 

    self.Flights.add(aFlight); 
self.Bookings->select(b | b.Flight = aFlight)->first

    There is an operator addReturnIndexOf0 that adds the Flight - and returns the zero based index of Booking. 

    self.Bookings.at0(self.Flights.addReturnIndexOf0(aFlight)).AttributeOnBooking

    It adds the object at the other end to the association and looks up the created link object - in this case, a Booking object and returns it.

    Please note that it's usually good to set the names on the links, both the InnerLinkName and the LinkRoleName.

    In this example: this is the InnerLinkName and the LinkRoleName for the Person's end of the association.

    Linkrolename.png

    Note! From the Booking object, it's only one Person object in the association. Hence, Person, not Persons

    See also: Association classes

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