gistfile1.rb

namespace :flickr do
  
  desc "Fetches, checks and updates photos"
  task :default => [:fetch_photos, :check_photos, :update_photos]
  
  desc "Fetches photos for tags from flickr"
  task :fetch_photos => :merb_env do

    categories = Category.all

    puts "Getting photos for each category..."
    saved = 0
    # For each category
    categories.each do |category|
      puts "Getting photos for #{category.name}"
      # => Find all Jean's photos that are tagged as that category
      photos = Photo.find_for_tag(category.tag)
      # => Loop through results
      photos.each do |flickr_photo|
        next if Photo.get(flickr_photo.id)  
        # => If photo isn't stored, save in database
        photo = Photo.new 
        photo.attributes = {
          :id => flickr_photo.id, 
          :farm => flickr_photo.farm,
          :server => flickr_photo.server,
          :secret => flickr_photo.secret, 
          :title => flickr_photo.title,
          :category_id => category.id
        }
        # *TO DO => If the photo is stored but not associated with this category, add the association
        if photo.save
          puts "Saved new photo #{photo.title}"
          saved += 1
        else
          puts "Couldn't save photo \"#{photo.title}\". #{photo.errors.size} error(s)."
        end
      end
    end
    puts "Finished. #{saved} new photo(s) saved."
    
  end
  
  desc "Checks stored flickr photos"
  task :check_photos => :merb_env do
    
    puts "Checking photos..."
    checked, deleted = 0, 0
    # For each photo in the database
    photos = Photo.all
    photos.each do |photo|
      checked += 1
      # Check if photo still exists on flickr and is still tagged what we expect it to be
      result = Photo.fetch_info(photo.id, photo.secret)
      unless result && result[:info].tags.any? { |t| t.raw == photo.category.tag }
        # If it doesn't, delete it from the database
        if photo.destroy
          deleted += 1
          puts "Deleted #{photo.title}"
        else
          puts "Couldn't delete #{photo.title}"
        end
      end
    end
    puts "#{checked} photo(s) checked. #{deleted} photo(s) deleted."
    
  end
  
  desc "Updates stored flickr photos"
  task :update_photos => :merb_env do
    
    puts "Updating photos..."
    updated = 0
    # For each photo in the database
    photos = Photo.all
    photos.each do |photo|
      result = Photo.fetch_info(photo.id, photo.secret)
      if result
        # Store the extra information and size info
        photo.attributes = {
          :title          =>  result[:info].title,
          :description    =>  result[:info].description,
          :url            =>  result[:info].urls.first._content,
          :square_src     =>  result[:sizes].first.source,
          :square_side    =>  result[:sizes].first.height,
          :medium_src     =>  result[:sizes][3].source,
          :medium_width   =>  result[:sizes][3].width,
          :medium_height  =>  result[:sizes][3].height,
          :active         =>  true
        }
        if photo.save
          puts "Saved photo #{photo.title}"
          updated += 1
        else
          puts "Couldn't save photo \"#{photo.title}\". #{photo.errors.size} error(s)."
        end
      else
        puts "Failed to retrieve info for photo #{photo.title}"
      end
    end
    puts "Finished. #{updated} photo(s) updated."
    
  end
  
end