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class Tweet < ActiveRecord::Base
belongs_to :user
belongs_to :in_reply_to, class_name: "Tweet"
has_many :replies, class_name: "Tweet", foreign_key: "in_reply_to_id"
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, ->(period = 3.days) { where("tweets.id > ?", snowflake_min(Time.zone.now - period)) }
scope :reacted, ->(count = nil) { where("reactions_count >= ?", (count || 1).to_i) }
scope :not_protected, -> { joins(:user).references(:user).where(users: { protected: false }) }
scope :registered, -> { joins(user: :account).references(:account).where(accounts: { status: Account::ACTIVE }) }
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) { offset((page - 1) * all.limit_value) }
scope :order_by_id, -> { order(id: :desc) }
scope :order_by_reactions, -> { order(reactions_count: :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) {
load_count = all.limit_value.to_i + all.offset_value.to_i
load_count = nil if load_count == 0
un = [:favorites, :retweets].map {|m|
user.__send__(m).select(:tweet_id).order(tweet_id: :desc).limit(load_count)
}.map {|m| "(#{m.to_sql})" }.join(" UNION ")
joins("INNER JOIN ((#{un})) reactions ON reactions.tweet_id = tweets.id")
}
def twitter_url
"https://twitter.com/#{self.user.screen_name}/status/#{self.id}"
end
def reply_ancestors(max_level = Float::INFINITY)
nodes = []
node = self
level = 0
while node.in_reply_to && level < max_level
nodes.unshift(node = node.in_reply_to)
level += 1
end
nodes
end
def reply_descendants(max_level = Float::INFINITY)
nodes = []
c_nodes = [self]
level = 0
while c_nodes.size > 0 && level < max_level
nodes.concat(c_nodes.map! {|node| node.replies }.flatten!)
level += 1
end
nodes.sort_by {|t| t.id }
end
def update_reactions_count(favorites_count: 0, retweets_count: 0, json: {})
fav_op = favorites_count >= 0 ? "+" : "-"
rts_op = retweets_count >= 0 ? "+" : "-"
Tweet.where(id: self.id)
.update_all("favorites_count = GREATEST(favorites_count #{fav_op} #{favorites_count.abs}, #{(json[:favorite_count] || 0).to_i}), " +
"retweets_count = GREATEST(retweets_count #{rts_op} #{retweets_count.abs}, #{(json[:retweet_count] || 0).to_i}), " +
"reactions_count = favorites_count + retweets_count")
end
def self.create_from_json(json)
tweet = transaction do
self.find_by(id: json[:id]) ||
self.create!(id: json[:id],
text: extract_entities(json),
source: json[:source],
tweeted_at: json[:created_at],
in_reply_to_id: json[:in_reply_to_status_id],
user: User.create_from_json(json[:user]))
end
rescue ActiveRecord::RecordNotUnique => e
logger.debug("Duplicate tweet: #{tweet}: #{e.class}")
rescue => e
logger.error("Failed to create a tweet: #{tweet}: #{e.class}: #{e.message}/#{e.backtrace.join("\n")}")
ensure
return tweet
end
def self.create_from_twitter_object(obj)
t = self.create_from_json(obj.attrs)
t.update_reactions_count(json: obj.attrs)
t
end
def self.destroy_from_json(json)
deleted_count = self.delete(json[:delete][:status][:id])
if deleted_count > 0
Favorite.where(tweet_id: json[:delete][:status][:id]).delete_all
Retweet.where(tweet_id: json[:delete][:status][:id]).delete_all
true
else
false
end
end
def self.import(id, client = nil)
client ||= Account.random.client
st = client.status(id)
tweet = self.create_from_twitter_object(st)
tweet.update(text: extract_entities(st.attrs),
source: st.attrs[:source],
in_reply_to_id: st.attrs[:in_reply_to_status_id])
begin
nt = tweet
nt = self.create_from_twitter_object(client.status(nt.in_reply_to_id)) while !nt.in_reply_to && nt.in_reply_to_id
rescue Twitter::Error
logger.warn($!)
end
tweet.reload
end
def self.eager_load_for_html
self.eager_load(:user)
end
def self.filter_by_query(query)
strings = []
query.gsub!(/"((?:\\"|[^"])*?)"/) {|m| strings << $1; "##{strings.size - 1}" }
escape_text = -> str do
str.gsub(/#(\d+)/) { strings[$1.to_i] }
.gsub("%", "\\%")
.gsub("*", "%")
.gsub("_", "\\_")
.gsub("?", "_")
end
parse_condition = ->(scoped, token) do
positive = !token.slice!(/^[-!]/)
where_args = case token
when /^(?:user|from):([A-Za-z0-9_]{1,20})$/
u = User.find_by(screen_name: $1)
uid = u && u.id || -1
{ user_id: uid }
when /^fav(?:orite)?s?:(\d+)$/
["favorites_count >= ?", $1.to_i]
when /^(?:retweet|rt)s?:(\d+)$/
["retweets_count >= ?", $1.to_i]
when /^(?:sum|(?:re)?act(?:ion)?s?):(\d+)$/
["reactions_count >= ?", $1.to_i]
when /^(?:source|via):(.+)$/
["source LIKE ?", escape_text.call($1)]
when /^text:(.+)$/
["text LIKE ?", "%" + escape_text.call($1) + "%"]
else
nil
end
positive ? scoped.where(where_args) : scoped.where.not(where_args)
end
query.scan(/\S+/).inject(self.all) {|s, token| parse_condition.call(s, token) }
end
private
# replace t.co with expanded_url
def self.extract_entities(json)
entity_values = json[:entities].values.flatten.sort_by {|v| v[:indices].first }
entity_values.select! {|e| e[:url] }
result = ""
last_index = entity_values.inject(0) do |last_index, entity|
result << json[:text][last_index...entity[:indices].first]
result << entity[:expanded_url]
entity[:indices].last
end
result << json[:text][last_index..-1]
result
end
def self.snowflake_min(time)
(time.to_datetime.to_i * 1000 - 1288834974657) << 22
end
end
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