createCollections.rb

user = User.find_by(:email => "depositor@wpi.edu")
options = { title: 'Nestable Collection', description: 'Sample collection type that allows nesting of collections.', nestable: true, discoverable: true, sharable: true, allow_multiple_membership: true, require_membership: true }
def create_collection_type(machine_id, options)
  coltype = Hyrax::CollectionType.find_by_machine_id(machine_id)
  return coltype if coltype.present?
  default_options = {
    nestable: false, discoverable: false, sharable: false, allow_multiple_membership: false,
    require_membership: false, assigns_workflow: false, assigns_visibility: false,
    participants: [{ agent_type: Hyrax::CollectionTypeParticipant::GROUP_TYPE, agent_id: ::Ability.admin_group_name, access: Hyrax::CollectionTypeParticipant::MANAGE_ACCESS },
                   { agent_type: Hyrax::CollectionTypeParticipant::GROUP_TYPE, agent_id: ::Ability.registered_group_name, access: Hyrax::CollectionTypeParticipant::CREATE_ACCESS }]
  }
  final_options = default_options.merge(options.except(:title))
  Hyrax::CollectionTypes::CreateService.create_collection_type(machine_id: machine_id, title: options[:title], options: final_options)
end

def create_public_collection(user, type_gid, id, options)
  options[:visibility] = Hydra::AccessControls::AccessRight::VISIBILITY_TEXT_VALUE_PUBLIC
  create_collection(user, type_gid, id, options)
end

def create_collection(user, type_gid, id, options)
  col = Collection.where(id: id)
  return col.first if col.present?
  col = Collection.new(id: id)
  col.attributes = options.except(:visibility)
  col.apply_depositor_metadata(user.user_key)
  col.collection_type_gid = type_gid
  col.visibility = options[:visibility]
  col.save
  Hyrax::Collections::PermissionsCreateService.create_default(collection: col, creating_user: user)
  col
end

nestable_gid = create_collection_type('nestable_collection', options).gid

scae = create_public_collection(user, nestable_gid, 'scae', title: ['Special Collections, Archives, and Exhibits'], description: ['Special Collections, Archives, and Exhibits'])
scae.reindex_extent = Hyrax::Adapters::NestingIndexAdapter::LIMITED_REINDEX
scae.save()

cdn = create_public_collection(user, nestable_gid, 'cdn', title: ["Charles Dickens's Novels"], description: ["Charles Dickens's Novels"])
cdn.reindex_extent = Hyrax::Adapters::NestingIndexAdapter::LIMITED_REINDEX
cdn.save()

nn = create_public_collection(user, nestable_gid, 'nn', title: ['Nicholas Nickleby'], description: ['Nicholas Nickleby'])
nn.reindex_extent = Hyrax::Adapters::NestingIndexAdapter::LIMITED_REINDEX
nn.save()

Hyrax::Collections::NestedCollectionPersistenceService.persist_nested_collection_for(parent: scae, child: cdn)
Hyrax::Collections::NestedCollectionPersistenceService.persist_nested_collection_for(parent: cdn, child: nn)