Symfony2 Form Validator - Comparing old and new values before flush

Question

I was wondering if there is a way to compare old and new values in a validator within an entity prior to a flush.

I have a Server entity which renders to a

Answer 1

Previous answers are perfectly valid, and may fit your use case.

For "simple" use case, it may fill heavy though. In the case of an entity editable through (only) a form, you can simply add the constraint on the FormBuilder:

add('fooField', IntegerType::class, [
                'constraints' => [
                    new GreaterThanOrEqual(['value' => $builder->getData()->getFooField()])
                ]
            ])
        ;
    }
}

This is valid for any Symfony 2+ version.