gistfile1.rb

#If you are setting a custom folder for Carrierwave uploads and that folder structure relies on related objects, 
# be sure that those related objects are already created before initializing the carrierwave object! 



##This is bad

User.create(
    username: "cosby",
    avatar: Avatar.create(file: <a file>)
  )
  
##This is Good
  user = User.create(username: "cosby")
  user.build_avatar(file: <a file>)
  user.save