Embedding a collection of forms Symfony2 forms with adding and deleting allowed

Question

In Symfony2, if I embed a collection of forms pointing at a many to one relationship in Doctrine and allow adding and deletion, if I delete a record from the beginning, add one

Answer 1

One way to pass primary id is to use INDEX BY.

For example, say I have an entity called Customer and a Customer has several Emails. In my Customer repository class, I can specify my collection to be indexed by Email's primary id.

$qb->select('c, e')
    ->leftJoin('c.emails', 'e', null, null, 'e.id')
    ->where('c.id = :id');

By doing so, the generated name of the input tag would be

customer[emails][e.id][fieldName]

Upon submitting the form, Symfony will bind the request values according to the input names.