add first and last predicates when proxy is added

[elrayle]

col = Collection.new(id: 'col-1')    # includes Hydra::Works::CollectionBehaviors
col.save
work = BibliographicWork.new(id: 'work-1')  # includes Hydra::Works::GenericWorkBehaviors
col.generic_works << work

In Fedora...

Observations:

• col contains work
• col hasMember proxy to work
• first and last predicates DO NOT exist in col

col.save

Observations:

• first and last predicates now exist in col

If work is automatically saved and a proxy is added to col's members, then first and last
predicates should also automatically be added without having to do a manually save.

[jcoyne]

@elrayle are you describing behavior you'd like to see or a problem with the current behavior? Can you describe what it will look like when the problem is fixed? Also the "view in fedora" links aren't very helpful as they point to your local system. Can you add screenshots instead?

[elrayle]

I must have been half asleep when I wrote that. The issue is with the first and last predicates on the collection. Those predicates do not get created when the proxy is created and added to the collection and they should be added when the proxy is added as a member.

[elrayle]

I added two tests to association_spec.rb (lines 80-88) in branch test_issue_80 to check for first and last.

[tpendragon]

I think this is fixed with the new ordering - yes @jcoyne @elrayle?