Validating exceptions inside methods with Symfony2 and Doctrine

Question

I'm new in Symfony2, so I'm pretty sure this is basic but I can't find the answer on the web,

I have an entity persisted in MySql through Doctrine, all of its properties have their own validation rules in the validation.yml. When the form is for example a Create/Update form, that's fine: if some rule doesn't match, the proper message pops out in the form noticing the user.

However, what happens when inside a method (let's say a setter) I use an object of another class (a utility, not another entity) for a more complex validation that may throw an exception? Is there a way that its message may be shown like the other validation rules in the form?

Answer 1

Instead of throwing an exception, you should use the Callback constraint, to execute the logic inside the utility method just as a validator.

In the documentation referenced above, you can see how you can add error messages to the validation errors from within this utility method.