我已经将此工作了，但我没有

The times I have gotten this to work, I did not

use Doctrine\Common\Collections\ArrayCollection; 

我只是

$this->field = new \Doctrine\Common\Collections\ArrayCollection();

在我的构造函数中.

此外，您可能需要考虑将住户"(似乎是客户中的成员)添加为实体形式:

Also, you may want to consider adding Household (which appear to be the members in clients) as an entity form:

->add('members', 'entity', array(
    'type' => new HouseholdType(),
    'allow_add' => true, 
    'by_reference' => false,
    ));