The behavior of presence validation combined with boolean fields is a bit confusing, Object#blank? causes ActiveModel::Validations::PresenceValidator to identify a boolean field with a false value as blank. The common solution to this issue is to use the inclusion validation, but it seems a bit off for me that i would need to remember to create a specific validation to ensure presence of a boolean field - when i use a different one for any other field type. My suggestion is as follows, Alter the current implementation of the Validator classes to take into consideration the validated field (if it is a field) and choose a validation process that matches this field. at the moment i can only think of a boolean field as an exception that will benefit from this implementation - but i think that it would present a much more lean way to validate data layer fields. This issue was already discussed here: https://github.com/rails/rails/issues/6953 -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Core" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-core+unsubscribe@googlegroups.com. To post to this group, send email to rubyonrails-core@googlegroups.com. Visit this group at http://groups.google.com/group/rubyonrails-core. For more options, visit https://groups.google.com/groups/opt_out.