Valkyrie: Edit collection using PcdmCollection raises exception undefined thumbnail_id

[elrayle]

Descriptive summary

When Hyrax is configured with collection_model = "Hyrax::PcdmCollection", editing a collection raises exception undefined thumbnail_id.

Rationale

A collections should be able to be edited using the ActiveFedora::Base ::Collection or Valkyrie::Resource Hyrax::PcdmCollection. Eventually, all collection manipulation will be through Valkyrie.

Expected behavior

When editing a collection with collection_model = "Hyrax::PcdmCollection", expect the collection edit form to load.

Actual behavior

When editing a collection with collection_model = "Hyrax::PcdmCollection", raises exception undefined thumbnail_id.

Steps to reproduce the behavior

Prerequisite:

• edit config/initializers/hyrax.rb and change or set config.collection_model to "Hyrax::PcdmCollection"
• restart rails server
• login and create a collection

To reproduce:

1. Login
2. Dashboard -> Collections
3. Click the action menu beside an existing collection
4. Select Edit collection

raises undefined thumbnail_id

Related work

See https://github.com/samvera-labs/nurax-pg/issues/27

[elrayle]

PR #5287 adds a check to skip the code that allows a user to select a thumbnail for the collection. When this issue is resolved, the skip should be removed.

[no-reply]

per #5764, we shouldn't undo the changes in #5287.

collection thumbnail selection is still a serious issue (for all model types), even after this ticket is closed.