105 lines
2.4 KiB
Ruby
105 lines
2.4 KiB
Ruby
class Vote < ActiveRecord::Base
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belongs_to :photo
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belongs_to :user
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validates_presence_of :photo_id
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validate :photo_id_cannot_be_zero
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validates_uniqueness_of :user_id, :scope => :photo_id, :if => lambda { |x| x.session_id.to_s.empty? }
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validates_uniqueness_of :session_id, :scope => :photo_id, :if => lambda { |x| !x.session_id.to_s.empty? }
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validates_presence_of :session_id, :if => lambda { |x| x.user_id.to_s.empty? }
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validates_presence_of :user_id, :if => lambda { |x| x.session_id.to_s.empty? }
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attr_protected :user_id
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attr_protected :session_id
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after_create :update_photo_stats
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after_destroy :update_photo_stats
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##
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# Checks if this vote is anonymous, or not an authenticated User vote.
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#
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def anonymous?
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self.user_id.nil?
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end
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##
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# Convert this Vote to a number.
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#
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def to_i
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self.vote? ? 1 : 0
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end
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##
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# Is this a 'no' vote.
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#
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def zero?
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self.to_i == 0
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end
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##
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# Is this a 'yes' vote.
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#
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def one?
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self.to_i == 1
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end
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##
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# Checks if a user has voted for a Photo. If you pass a User for user it will
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# check for an authenticated user, else it will look for an anonymous vote.
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#
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def self.voted_for?(photo, user)
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c = [ 'photo_id = :pid' ]
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v = { :pid => (photo.respond_to?('id') ? photo.id : photo) }
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if user.respond_to?('user_name')
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c << 'user_id = :uid'
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v[:uid] = user.id
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else
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c << 'session_id = :uid'
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v[:uid] = user
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end
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self.find :first, :conditions => [ c.join(' AND '), v ]
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end
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##
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# Does a quick find and collect on the cast votes so you can find all voted
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# photo ids.
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#
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def self.voted_photo_ids(user)
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c = if user.respond_to?('user_name')
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"votes.user_id = #{user.id}"
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else
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"votes.session_id = '#{user}'"
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end
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self.find(:all, :conditions => c, :select => 'photo_id').collect { |v| v.photo_id }
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end
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protected
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##
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# Checks to make sure the photo_id is not zero. There will never be a zero
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# id of a Photo.
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#
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def photo_id_cannot_be_zero
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self.errors.add :photo_id, 'cannot be zero' if self.photo_id.to_i == 0
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end
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##
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# Recalc the stats in the Photo for specific stats don't have to query the
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# database.
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#
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def update_photo_stats
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v = if self.frozen?
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-1
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else
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1
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end
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self.photo.votes_count += v
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if self.zero?
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self.photo.zero_votes += v
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else
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self.photo.one_votes += v
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end
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self.photo.save
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end
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end
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