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Clarify possible validations you can use to avoid a NULL boolean value 

in the database. Closes #16304 [ci skip]
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Zachary Scott 2014-10-03 17:36:56 -07:00
parent 44e6d91a07
commit a4d8b62ed1
1 changed files with 8 additions and 2 deletions
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10
guides/source/active_record_validations.md
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@ -524,9 +524,15 @@ If you validate the presence of an object associated via a `has_one` or
`marked_for_destruction?`.
Since `false.blank?` is true, if you want to validate the presence of a boolean
field you should use `validates :field_name, inclusion: { in: [true, false] }`.
field you should use one of the following validations:
The default error message is _"can't be blank"_.
```ruby
validates :boolean_field_name, presence: true
validates :boolean_field_name, inclusion: { in: [true, false] }
validates :boolean_field_name, exclusion: { in: [nil] }
```
By using one of these validations, you will ensure the value will NOT be `nil`
which would result in a `NULL` value in most cases.
### `absence`