Table footer used within models-table/table.

By default it's an empty component. It should be used with a block context:

<ModelsTable @data={{data}} @columns={{columns}} as |MT|>
  <MT.Table as |Table|>
    <Table.Footer as |Footer|>
      {{! ... }}
    </Table.Footer>
    {{! ... }}
  </MT.Table>
  {{! .... }}
</ModelsTable>

Block usage example 2:

<ModelsTable @data={{data}} @columns={{columns}} as |MT|>
  <MT.Table as |Table|>
    <Table.Footer as |Footer|>
       <tr>
         <td colspan={{if Footer.shouldAddExtraColumn  (inc MT.visibleProcessedColumns.length) MT.visibleProcessedColumns.length}}>
           {{! "inc" is a helper from ember-composable-helpers }}
           Some custom summary for table can be shown in the <code>tfoot</code>
         </td>
       </tr>
     </Table.Footer>
    {{! ... }}
  </MT.Table>
  {{! .... }}
</ModelsTable>

References to the following properties are yielded:

• shouldAddExtraColumn - determines if extra column should be added to the row in the tfoot. It happens when rows grouping is used and extra column with group values exists