I solved the problem.
The trick is to add the ID of the ingredient like so: echo $form->input
('IngredientList.'.$x.'.id', array('type'=>'hidden'));
You can see it in context below.
<?php
$x = 0;
foreach($ingredient_list as $ingredient)
{
?>
<table>
<tr>
<td><?php echo $form->input('IngredientList.'.$x.'.amount');
?></td>
<td><?php
echo
$form->label('IngredientList.'.$x.'.measurement_type_id',
'Measurement Type');
echo
$form->select('IngredientList.'.$x.'.measurement_type_id',
$measurement_types);
?></td>
<td><?php echo
$form->input('IngredientList.'.$x.'.description'); ?
></td>
<td><?php
echo $form->label('IngredientList.'.$x.'.ingredient_id',
'Ingredient');
echo
$form->select('IngredientList.'.$x.'.ingredient_id',
$ingredients);
?></td>
</tr>
</table>
<?php
echo $form->input('IngredientList.'.$x.'.id', array
('type'=>'hidden'));
$x++;
}
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