Required attractor model attr_accessor is missing with Paperclip

I am trying to load more than one file into a movie. I keep getting the error Asset model missing required attr_accessor for 'asset_file_name'

and I'm not sure why, here is my code:

asset.rb model

class Asset < ActiveRecord::Base
  belongs_to :movie

  has_attached_file :asset
end

      

        
        
        
      

    

movie.rb model

class Movie < ActiveRecord::Base
  belongs_to :user

  has_many :assets
  accepts_nested_attributes_for :assets

  validates :title, presence: true

  default_scope order: 'movies.created_at DESC'
end

      

        
        
        
      

    

I also ran rails g paperclip movie asset

which generated the following migration file

class AddAttachmentAssetToMovie < ActiveRecord::Migration
  def self.up
    add_column :movies, :asset_file_name, :string
    add_column :movies, :asset_content_type, :string
    add_column :movies, :asset_file_size, :integer
    add_column :movies, :asset_updated_at, :datetime
  end

  def self.down
    remove_column :movies, :asset_file_name
    remove_column :movies, :asset_content_type
    remove_column :movies, :asset_file_size
    remove_column :movies, :asset_updated_at
  end
end

      

        
        
        
      

    

And here is my "create assets" migration that came up after creating the asset model:

class CreateAssets < ActiveRecord::Migration
  def change
    create_table :assets do |t|
    t.string :asset_file_name
    t.integer :asset_file_size
    t.string :asset_content_type
    t.datetime :asset_updated_at
    t.text :asset_description
    t.integer :movie_id

    t.timestamps
  end
end

      

        
        
        
      

    

Can you guess why I am getting the error Asset model missing required attr_accessor for 'asset_file_name'

?