Scanned Resource form Collection list not sorted by title

[escowles]

The code appears to sort the collection list by title:

  <%= f.input :member_of_collection_ids,
              collection: @collections.sort_by { |title| title.to_s },

But it is sorting by ID instead:

<option value="008ddfbc-053b-4ecb-b755-1847902b6994">aisls_yd</option>
<option value="012ce943-1960-4153-b111-88c5a6c8e60b">Pre-1979 Persian Periodicals</option>
<option value="02590a33-e8ad-42eb-8239-f8decf871de1">Need Host Record</option>
<option value="029ecaaf-0e84-4cb7-8dd2-9adc16b68640">José Bianco Papers C0681</option>
<option value="03556507-2e2b-4393-a50f-5207877c38e8">William McElwee Miller Collection of Bābī Writings and Other Iranian Texts C0723.1-47</option>