GenericWorks should have a .generic_file_ids= setter method

[flyingzumwalt]

I think this translates into a feature request for AF::Aggregation, but the request only makes sense with an example. This is the example.

Use case: changing the order of generic_files within a generic_work
Currently I have to

page_ids = book.generic_file_ids
# {... rearrange page_ids ...}
book.member_ids = page_ids

I get an error if I try to call book.generic_file_ids = page_ids, even though that's where I got the ids.

Note that generic_file_ids is a filtered subset of member_ids, so the code sample here actually risks accidentally removing other members from book.members.

Of course, I could always use member_ids for both getter and setter but that violates the whole reason for having the generic_file_ids method in the first place.

[flyingzumwalt]

Blocked by samvera-deprecated/activefedora-aggregation#71

[jcoyne]

Keep in mind that the ids setter isn't going to get you much. It'll still have to do a find on each of the ids so that it can run the type_validator on each member.

[flyingzumwalt]

Ah. So maybe it's a moot point for tomorrow's work. I was hoping to avoid loading the objects before saving the new order.

[flyingzumwalt]

My use case is for reordering page images within books that sometimes have
hundreds of pages. Loading all of the member objects is not an option.

On Tuesday, September 8, 2015, Justin Coyne [email protected]
wrote:

Keep in mind that the ids setter isn't going to get you much. It'll still
have to do a find on each of the ids so that it can run the type_validator
on each member.

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#208 (comment)
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[jcoyne]

Yeah, I think you want to make a special function for that. Maybe AggregationProxy#swap(i, j)