Managing sets of relationships with an Operation

current destroy photo

PhotosController
  def destroy
      @photo = Photo.find(params[:id])
      @photo.destroy
   end
   
Planting
  before_destroy do |planting|
    photolist = planting.photos.to_a # save a temp copy of the photo list
    planting.photos.clear # clear relationship b/w planting and photo

    photolist.each do |photo|
      photo.destroy_if_unused
    end
  end
  
Garden
   before_destroy do |garden|
     photolist = garden.photos.to_a # save a temp copy of the photo list
     garden.photos.clear # clear relationship b/w garden and photo

     photolist.each do |photo|
       photo.destroy_if_unused
     end
   end

Harvest
  before_destroy do |harvest|
    photolist = harvest.photos.to_a # save a temp copy of the photo list
    harvest.photos.clear # clear relationship b/w harvest and photo

    photolist.each do |photo|
      photo.destroy_if_unused
    end
  end
  
GardensController
  def destroy
    @garden = Garden.find(params[:id])
    @garden.destroy
    expire_fragment("homepage_stats")
    
HarvestsController
  def destroy
    @harvest = Harvest.find(params[:id])
    @harvest.destroy
    
PlantingController
  def destroy
    @planting = Planting.find(params[:id])
    @garden = @planting.garden
    @planting.destroy

possible future state

class SafePhotoRemovalOperation
  def destroy_if_unused(photo) # more or less the same as current implementation
  
  def destroy_all_relationships!(photo) # Currently in before_destroy do |photo|
    photo.plantings.clear
    photo.harvests.clear
    photo.gardens.clear

  ## Remove photos safely from an object we are destroying, ie: garden
  def remove_photo_from_object(object)
    photolist = planting.photos.to_a # save a temp copy of the photo list
    object.photos.clear # clear relationship b/w planting and photo

    photolist.each do |photo|
      destroy_if_unused(photo)
    end

end