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class Photo < ActiveRecord::Base
  acts_as_taggable
end

photo = Photo.new

# standard tagging with a string
photo.tag 'brazil rio beach'

# tagging with an array
photo.tag ['south america', 'soccer']

# tagging with a different separator
photo.tag 'beautiful women, babes, hot chicks', :separator => ','

# tagging with a Proc separator
photo.tag '2001..2005', :separator => proc { |s| eval(s).to_a }

# suppose your tags_photos join table has attributes 
# and you want to set them while you tag
photo.tag 'samba', :attributes => { :tagged_at => Time.now }

# Let´s do some tag searching now
# Photos with soccer OR rio
Photo.find_tagged_with :any => 'soccer rio'

# Photos with beach AND women (combo tags)
Photo.find_tagged_with :all => 'beach woman'

# Using a different separator 
Photo.find_tagged_with :all => 'beach+woman', :separator => '+'