```ruby
module ActiveRecord

  module HumanizedErrors
    def humanized_errors
      errors.clear
      send :run_validations!
      errors.full_messages.join ', '
    end
  end

  Base.class_eval do
    include HumanizedErrors
  end

end
```

Use `valid?` to trigger validations.
user
```ruby
module ActiveRecord

  module HumanizedErrors
    def humanized_errors
      valid?
      errors.full_messages.join ', '
    end
  end

  Base.class_eval do
    include HumanizedErrors
  end

end
```
assistant