Custom error message for unless validation in Rails 5

Question

I have the following validation in my model:

validates :cep, presence: true, :unless => lambda { |o| o.location }

How can I customize the error message that shows when the validation fails?

Answer 1

将message选项传递给validates方法。

validates :cep, presence: { message: 'Your custom error message' }, unless: lambda { |o| o.location }