class ActiveModel::Errors

# => ["Name is too short (minimum is 5 characters)", "Name can't be blank"]
person.errors.full_messages_for(:name)
person = Person.create()

end
validates_length_of :name, in: 5..30
validates_presence_of :name, :email
class Person

Returns all the full error messages for a given attribute in an array.

def full_messages_for(attribute)
  attribute = attribute.to_sym
  messages[attribute].map { |message| full_message(attribute, message) }
end