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class Tweet < ActiveRecord::Base
extend Aclog::Twitter
belongs_to :user
has_many :favorites, -> { order("favorites.id") }, dependent: :delete_all
has_many :retweets, -> { order("retweets.id") }, dependent: :delete_all
has_many :favoriters, -> {order("favorites.id") }, through: :favorites, source: :user
has_many :retweeters, -> { order("retweets.id") }, through: :retweets, source: :user
scope :recent, ->(days = 3) { where("tweets.id > ?", snowflake(Time.zone.now - days.days)) }
scope :reacted, -> {where("tweets.favorites_count > 0 OR tweets.retweets_count > 0") }
scope :not_protected, -> { includes(:user).where(users: {protected: false}) }
scope :max_id, -> id { where("tweets.id <= ?", id.to_i) if id }
scope :since_id, -> id { where("tweets.id > ?", id.to_i) if id }
scope :page, ->(page, count) { offset((page - 1) * count) }
scope :order_by_id, -> { order("tweets.id DESC") }
scope :order_by_favorites, -> { order("tweets.favorites_count DESC") }
scope :order_by_retweets, -> { order("tweets.retweets_count DESC") }
scope :order_by_reactions, -> { order("COALESCE(tweets.favorites_count, 0) + COALESCE(tweets.retweets_count, 0) DESC") }
scope :favorited_by, -> user { joins(:favorites).where(favorites: {user: user}) }
scope :retweeted_by, -> user { joins(:retweets).where(retweets: {user: user}) }
scope :discovered_by, -> user {
un = "SELECT favorites.tweet_id FROM favorites WHERE favorites.user_id = #{user.id}" +
" UNION " +
"SELECT retweets.tweet_id FROM retweets WHERE retweets.user_id = #{user.id}"
joins("INNER JOIN (#{un}) m ON m.tweet_id = tweets.id")
}
def self.list(params, options = {})
params[:page] ||= "1" if options[:force_page]
count = params[:count].to_i
count = Settings.tweets.count_default unless (1..Settings.tweets.count_max) === count
ret = limit(count)
if params[:page]
ret = ret.page(params[:page].to_i, count)
else
ret = ret.max_id(params[:max_id]).since_id(params[:since_id])
end
if options[:cache] && options[:cache] > 0
ret = ret.cache_list(options[:cache])
end
ret
end
def self.delete_from_id(id)
return {} if id.is_a?(Array) && id.size == 0
begin
# counter_cache の無駄を省くために delete_all で
deleted_tweets = Tweet.where(id: id).delete_all
if deleted_tweets > 0
deleted_favorites = Favorite.where(tweet_id: id).delete_all
deleted_retweets = Retweet.where(tweet_id: id).delete_all
end
unless id.is_a?(Integer) && deleted_tweets == 1
deleted_retweets = Retweet.where(id: id).destroy_all.size # counter_cache
end
return {tweets: deleted_tweets, favorites: deleted_favorites, retweets: deleted_retweets}
rescue
logger.error("Unknown error while deleting tweet: #{$!}/#{$@}")
end
end
def self.from_hash(hash)
begin
t = logger.quietly do
create!(id: hash[:id],
text: hash[:text],
source: hash[:source],
tweeted_at: hash[:tweeted_at],
user_id: hash[:user_id])
end
logger.debug("Created Tweet: #{hash[:id]}")
return t
rescue ActiveRecord::RecordNotUnique
logger.debug("Duplicate Tweet: #{hash[:id]}")
rescue => e
logger.error("Unknown error while inserting tweet: #{e.class}: #{e.message}/#{e.backtrace.join("\n")}")
end
end
def self.parse_query(query)
str = query.dup
strings = []
str.gsub!(/"((?:\\"|[^"])*?)"/) {|m| strings << $1; "##{strings.size - 1}" }
groups = []
while str.sub!(/\(([^()]*?)\)/) {|m| groups << $1; " $#{groups.size - 1} " }; end
conv = -> s do
s.scan(/\S+(?: +OR +\S+)*/).map {|co|
co.split(/ +OR +/).map {|token|
if /^\$(\d+)$/ =~ token
conv.call(groups[$1.to_i])
else
parse_condition(token, strings)
end
}.inject(&:or)
}.inject(&:and)
end
where(conv.call(str))
end
private
def self.parse_condition(token, strings)
tweets = Tweet.arel_table
escape_text = -> str do
str.gsub(/#(\d+)/) { strings[$1.to_i] }
.gsub("%", "\\%")
.gsub("*", "%")
.gsub("_", "\\_")
.gsub("?", "_")
end
positive = token[0] != "-"
case token
when /^-?(?:user|from):([A-Za-z0-9_]{1,20})$/
u = User.find_by(screen_name: $1)
uid = u && u.id || 0
tweets[:user_id].__send__(positive ? :eq : :not_eq, uid)
when /^-?since:(\d{4}(-?)\d{2}\2\d{2})$/
tweets[:id].__send__(positive ? :gteq : :lt, snowflake(Date.parse($1)))
when /^-?until:(\d{4}(-?)\d{2}\2\d{2})$/
tweets[:id].__send__(positive ? :lt : :gteq, snowflake(Date.parse($1) + 1))
when /^-?favs?:(\d+)$/
tweets[:favorites_count].__send__(positive ? :gteq : :lt, $1.to_i)
when /^-?rts?:(\d+)$/
tweets[:retweets_count].__send__(positive ? :gteq : :lt, $1.to_i)
when /^-?(?:sum|reactions?):(\d+)$/
(tweets[:favorites_count] + tweets[:retweets_count]).__send__(positive ? :gteq : :lt, $1.to_i)
when /^(?:source|via):(.+)$/
source_text = "<url:%:#{escape_text.call($1).gsub(":", "%3A")}>"
tweets[:source].__send__(positive ? :matches : :does_not_match, source_text)
else
search_text = escape_text.call(positive ? token : token[1..-1])
tweets[:text].__send__(positive ? :matches : :does_not_match, "%#{search_text}%")
end
end
def self.cache_list(expires_in)
key = "tweets/#{scoped.to_sql}"
ids = Rails.cache.read(key)
unless ids
ids = pluck(:id)
Rails.cache.write(key, ids, expires_in: expires_in)
end
Tweet.where(id: ids).order("CASE tweets.id #{ids.each_with_index.map {|m, i| "WHEN #{m} THEN #{i}" }.join(" ")} END")
end
end
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