attachment_fu thumbnails

schaf88 wrote in post #236924:

howdy!
I had the problem that attachment_fu didn't make a thumbnail, but
everything else worked. I read this post
http://www.ruby-forum.com/topic/104213 and added a parent_id column. now
I get the following error when I trie to add a photo:

undefined method `find_or_initialize_by_thumbnail_and_parent_id' for
Photo:Class

my code is:

class Photo < ActiveRecord::Base
  has_attachment :content_type => :image,
                 :storage => :file_system,
           :max_size => 1.megabyte,
                 :thumbnails => { :thumb => '164x164>' }
end

create_table :photos do |t|
  t.column :filename, :string
  t.column :posted_on, :datetime
  t.column :description, :text
  t.column :name, :string
end

def create
  @photo = Photo.new(params[:photo])
  if @photo.save
    redirect_to :action => 'list'
  else
    render :action => 'new'
  end
end

My first guess, You don't have 'thumbnail' column in your database
table.
The clue is in the error message:
'find_or_initialize_by_thumbnail_and_parent_id', means attachment_fu
looks for both 'thumbnail' and 'parent_id' column

My db table looks something like this and it works fine.
create_table :photos do |t|
      t.string :filename, :null => false
      t.string :content_type
      t.string :thumbnail
      t.integer :size
      t.integer :width
      t.integer :height
      t.integer :parent_id
      t.integer :album_id