symfony - using sonata_type_collection against a custom form type instead of a property/relationship with another entity -

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is possible use sonata_type_collection against custom form type instead of property/relationship entity?

something this:

$formmapper->add('foo', 'sonata_type_collection',     array('type' => new \myvendor\mybundlebundle\form\type\blocktype()  ));

which throws me following error 

the current field `contingut` not linked admin. please create 1 target entity : ``

edit:

something did trick:

$formmapper->add('contingut', 'collection', array(                                      'type' => new \myvendor\mybundlebundle\form\type\block1type(),     'allow_add' => true,     'allow_delete' => true,     'by_reference' => false  ));

instead of custom type in example, can use native entity type.

$formmapper->add('cars',                             'collection',                             array(                                 'type' => 'entity',                                 'allow_add' => true,                                 'allow_delete' => true,                                 'by_reference' => false,                                 'label' => false,                                 'options' => array(                                     'class' => 'yourbundle:car',                                     'property' => 'name',                                     'label' => false                                 )                             )                         )

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