Does paperclip require all 4 columns (_file_name, _content_type,etc)?

问题

I am wondering if Paperclip does require all four columns in database as:

  add_column :users, :avatar_file_name,    :string
  add_column :users, :avatar_content_type, :string
  add_column :users, :avatar_file_size,    :integer
  add_column :users, :avatar_updated_at,   :datetime

Can I just add the avatar_file_name? And not add the other 3 columns?

It is because I wont to use paperclip instead of the filecolumn gem. And it uses only 1 column therefor I don´t want fill out all columns that paperclip support.

回答1:

I'm pretty sure you could just add one column + 3 attr_accessor playing a dummy role.

But this looks awkward and I wouldn't advise to do so.

来源：https://stackoverflow.com/questions/7475947/does-paperclip-require-all-4-columns-file-name-content-type-etc