I've got a table. In each row, I'd like to have a cell containing a
text field that dynamically updates a collection also in that cell. So
I need a uniquely identified part for each of these cells. I thought I
could use the model_id_class helper to give me a unique id to pass to
the part attribute like this (simplified to remove the irrelevant
fields):

      <table:list-items fields="notes">
        <notes-view:>
          <collection part="&model_id_class"/>
          <form with="&this.new" owner="list_item"
update="&model_id_class" >
            <field-list />
            <submit: label="Add note"/>
          </form>
        </notes-view:>
      </table:list-items>

But I get an "invalid part" error whenever I put anything other than
text in the value for part. Even underscores cause the error.

Thanks,
Andy
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