Today I found something strange about Symfony >=2.3 validators. I you use
$metadata->addPropertyConstraint('body', new Length(array('min' => 50)));
it allows empty inputs. I don't think it should do this or am I wrong?
This is the expected behaviour.
Just think about the different use cases: a phone number can be optional, but if the user has entered a phone number, it should be at least 10 characters.
So you need to combine your Length constraint with a NotNull/NotBlank constraint.
See https://github.com/symfony/symfony/issues/10221#issuecomment-34769066 for more explanation.
Btw : there is actually a brainstorming about empty string handling https://github.com/symfony/symfony/issues/11956.
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