How do I use the cascade option in Symfony2 Doctrine? - doctrine

Question

I'm trying to understand the cascade option in Doctrine in Symfony2.
I would like to be able to delete a child entity (and not trigger the foreign key constraint error.)
I have 3 entities:
Report
/**
* #ORM\OneToMany(targetEntity="Response", mappedBy="report")
*/
protected $responses;
/**
* #ORM\OneToMany(targetEntity="Response", mappedBy="report")
*/
protected $sms;
Response
/**
* #ORM\ManyToOne(targetEntity="Report", inversedBy="responses")
*/
protected $report;
SMS
/**
* #ORM\ManyToOne(targetEntity="Report")
*/
protected $report;
Now I would like to delete a Response entity but I get
SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row:
a foreign key constraint fails (mybundle.sms, CONSTRAINT FK_B0A93A77BB333E0D FOREIGN KEY (reportId) REFERENCES report (id))
Where do I use the cascade option and which option should I use (detach or remove)?
I can do a lot of trial and error to figure this out, but I was hoping for an expert explanation, so I don't overlook something.

Answer 1

Try using
/**
* #ORM\ManyToOne(targetEntity="Report", inversedBy="responses")
* #ORM\JoinColumn(name="reportId", referencedColumnName="id", onDelete="CASCADE")
*/
protected $report;
And then update yor schema. It will add database level Cascading

Answer 2

Ziumin's answer
using the onDelete option for the ORM JoinColumn
method worked when you want to delete a child item (Owning Side).
But if you want to delete a Response which is a parent item (Inverse Side), this is when cascade comes in handy. In the Report entity I added the following for each of its collections (OneToMany relationships):
Report
/**
* #ORM\OneToMany(targetEntity="Response", mappedBy="report", cascade={"remove"})
*/
protected $responses;
/**
* #ORM\OneToMany(targetEntity="SMS", mappedBy="report", cascade={"remove"})
*/
protected $sms;
Now, when I delete a Report, it removes all of its associated entries in the Response and SMS tables.

Answer 3

You may also use cascade=all for update all actions.
Report
/**
* #ORM\OneToMany(targetEntity="Response", mappedBy="report", cascade={"all"})
*/
protected $responses;
/**
* #ORM\OneToMany(targetEntity="SMS", mappedBy="report", cascade={"all"})
*/
protected $sms;