49 lines
2.0 KiB
Ruby
49 lines
2.0 KiB
Ruby
class Favorite < ActiveRecord::Base
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belongs_to :post
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scope :for_user, lambda {|user_id| where("user_id % 100 = #{user_id.to_i % 100} and user_id = #{user_id.to_i}")}
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attr_accessible :user_id, :post_id
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# this is necessary because there's no trigger for deleting favorites
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def self.destroy_all(hash)
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if hash[:user_id] && hash[:post_id]
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connection.execute("delete from favorites_#{hash[:user_id] % 100} where user_id = #{hash[:user_id]} and post_id = #{hash[:post_id]}")
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elsif hash[:user_id]
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connection.execute("delete from favorites_#{hash[:user_id] % 100} where user_id = #{hash[:user_id]}")
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end
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end
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def self.add(post, user)
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Favorite.transaction do
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User.where(:id => user.id).select("id").lock("FOR UPDATE NOWAIT").first
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return if Favorite.for_user(user.id).where(:user_id => user.id, :post_id => post.id).exists?
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Favorite.create!(:user_id => user.id, :post_id => post.id)
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updates = "fav_count = fav_count + 1"
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updates = "#{updates}, score = score + 1" if user.is_gold?
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Post.where(:id => post.id).update_all(updates)
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post.append_user_to_fav_string(user.id)
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User.where(:id => user.id).update_all("favorite_count = favorite_count + 1")
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user.favorite_count += 1
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# post.fav_count += 1 # this is handled in Post#clean_fav_string!
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post.score += 1 if user.is_gold?
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end
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end
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def self.remove(post, user)
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Favorite.transaction do
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User.where(:id => user.id).select("id").lock("FOR UPDATE NOWAIT").first
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return unless Favorite.for_user(user.id).where(:user_id => user.id, :post_id => post.id).exists?
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Favorite.destroy_all(:user_id => user.id, :post_id => post.id)
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updates = "fav_count = fav_count - 1"
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updates = "#{updates}, score = score - 1" if user.is_gold?
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Post.where(:id => post.id).update_all(updates)
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post.delete_user_from_fav_string(user.id)
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User.where(:id => user.id).update_all("favorite_count = favorite_count - 1")
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user.favorite_count -= 1
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post.fav_count -= 1
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post.score -= 1 if user.is_gold?
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end
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end
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end
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