How to destroy columns mistakenly created by Paperclip in Ruby on Rails

Question

As the title suggests, I accidentally add some random attachment columns to my model. Say I did rails generate paperclip portfolio href

How do I remove those columns created? rails destroy paperclip portfolio href doesnt seem to work!

Answer 1

For recent version rails 4++
Just create a migration
Example:

rails g migration remove_attachment_photo_to_course
Then open the migration file

class RemoveAttachmentPhotoToCourse < ActiveRecord::Migration                                                                                                                                                                             
  def change                                                                                                                                                                                                                                   
    remove_attachment :courses, :photo                                                                                                                                                                                                   
  end                                                                                                                                                                                                                              
end

Then run, to update the table

rake db:migrate 

Where:
photo is the name of paperclip attachment you want to remove
courses is the name of table name