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Adding information about 'allow_nil' option for 'numericality' [ci skip]

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Andrey Nering 2014-12-09 16:51:21 -02:00
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guides/source/active_record_validations.md
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@ -487,6 +487,8 @@ constraints to acceptable values:
* `:even` - Specifies the value must be an even number if set to true. The
default error message for this option is _"must be even"_.
NOTE: By default, `numericality` doesn't allow `nil` values. You can use `allow_nil: true` option to permit it.
The default error message is _"is not a number"_.
### `presence`