gistfile1.builder

##### I need to be able to eager load the notes element on the lesson element. Figured the best way to do it was through an 
##### association. 

##############
# doesn't work . . . conditions on associations don't take lambda's
class Note < ActiveRecord::Base
  belongs_to :notable, :polymorphic => true
end

class Lesson < ActiveRecord::Base
  has_one :note, :as => :notable, :conditions => lamda {['user_id = ?', User.current.id]}
end

##############
# Next step was to try default scope, doesn't work, no lambdas to default scope

class Note < ActiveRecord::Base
  belongs_to :notable, :polymorphic => true
  default_scope lambda {{:user_id => User.current.id}}
end

##############
# Okay, lets try this manually in my controllers and I will just create some magic model methods:
class Note < ActiveRecord::Base
  belongs_to :notable, :polymorphic => true
end

class Lesson < ActiveRecord::Base
  has_many :notes, :as => :notable
  belongs_to :course
end

class Course < ActiveRecord::Base
  has_many :lessons
end

#=> in my controller
course = Course.find params[:course_id]
lessons = course.lessons.find(:all, :include => [:other_stuff, :notes], :conditions => ["notes.user_id = ?", User.current.id])