I have two classes Event and Review.
The event has an instance object Review in it.
A review also has an object Event in it.
This means a bidirectional relationship between them (two arrows).
When an event is deleted the review will also be deleted.
This means a composition relationship between them (filled diamond at Event).
Now my question is:
How can I display the two arrows and the filled diamond together in the same line?
I’m wondering if I should left out the directional relation when showing the composition or aggregation?
With association the direction arrow(s) can be displayed with no problem, but having the diamond there is a problem…
To answer the headline of the question: bidirectional navigations can be shown using a double arrow (one at each end) or no arrow at all (since the association is bidirectional, there´s no need to add arrows).