Methods after has_one_attached don't work - ruby-on-rails-6

Question

I am using Active Storage to store images but and doesn't work for a specific model, first an example with a working model:
class GalleryImage < ApplicationRecord
has_one_attached :image
end
In this case everything works well, here is the console output:
2.7.0 :006 > ::GalleryImage.new.image
=> #<ActiveStorage::Attached::One:0x0000557a5b57b1f8 #name="image" ...>>
But, I have another model called AppSetting like this:
class AppSetting < ApplicationRecord
def hola
'hola'
end
has_one_attached :gimmick
def adios
'adios'
end
end
And, when I try it in the rails console:
2.7.0 :006 > ::AppSetting.new.hola
=> "hola"
2.7.0 :007 > ::AppSetting.new.gimmick
Traceback (most recent call last):
1: from (irb):7
NoMethodError (undefined method `gimmick' for #<AppSetting:0x0000560cb955b470>)
2.7.0 :008 > ::AppSetting.new.adios
Traceback (most recent call last):
2: from (irb):7
1: from (irb):8:in `rescue in irb_binding'
NoMethodError (undefined method `adios' for #<AppSetting:0x0000560cb94241d8>)
As you can see, the first method (hola) works well, but I'm getting NoMethodError (undefined method... error message for the next methods.
any help? please.