是否已经不赞成`validates_presence_of`（从Rails 3开始）？

Question

According the the Rails 3 release notes, validate_presence_of is deprecated .

However, I can see no mention of this in the documentation (for v4.0.2) .

Was this an error in the release notes/did it get re-precated/is the documentation wrong?

Answer 1

The syntax has changed to:

validates :some_field, :presence => true

Referrence: Link

Answer 2

It's a soft deprecation. Both syntaxes still exist, but the validates is newer and 'preferred'.

Answer 3

The method is still there, but since Rails 3 it is defined in a slightly different namespace than before.

Before Rails 3:

 ActiveModel::Validations::ClassMethods#validates_presence_of

Since Rails 3:

ActiveRecord::Validations::ClassMethods#validates_presence_of
ActiveModel::Validations::HelperMethods#validates_presence_of

I had to look very close to see the differences.

Conclusion: just keep using validates_presence_of !