Collection.select(%w(portable_data_hash)).where(portable_data_hash: pdhs).distinct().each do |collection|
@all_pdhs_for[collection.portable_data_hash] << collection
end
Collection.select(%w(portable_data_hash)).where(portable_data_hash: pdhs).distinct().each do |collection|
@all_pdhs_for[collection.portable_data_hash] << collection
end