Null
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Null
Validates that a value is exactly equal to null
. To force that a property
is simply blank (blank string or null
), see the Blank
constraint. To ensure that a property is not null, see NotNull.
Applies to | property or method |
Options | |
Class | Null |
Validator | NullValidator |
Basic Usage
If, for some reason, you wanted to ensure that the firstName
property
of an Author
class exactly equal to null
, you could do the following:
- YAML
- Annotations
- XML
- PHP
1 2 3 4 5
# src/Acme/BlogBundle/Resources/config/validation.yml
Acme\BlogBundle\Entity\Author:
properties:
firstName:
- 'Null': ~
Caution
When using YAML, be sure to surround Null
with quotes ('Null'
)
or else YAML will convert this into a null
value.