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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).merge(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, page_per) { limit(page_per).offset((page - 1) * page_per) }
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 }) }
class << self
# Builds a new instance of Tweet and initialize with JSON data from Twitter API.
# @note This method just builds an instance, doesn't save it.
# @param [Hash] json Data from Twitter API
# @return [Tweet] The new instance.
def build_from_json(json)
self.new(id: json[:id],
text: extract_entities(json),
source: json[:source],
tweeted_at: Time.parse(json[:created_at]),
user_id: json[:user][:id],
in_reply_to_id: json[:in_reply_to_status_id],
favorites_count: json[:favorite_count],
retweets_count: json[:retweet_count],
reactions_count: json[:favorite_count] + json[:retweet_count])
end
# Builds instances of Tweet and save them. This method is supposed to be used from collector daemon.
# @param [Array<Hash>] array Data from collector.
def create_bulk_from_json(array)
objects = array.map {|json| build_from_json(json) }
self.import(objects, on_duplicate_key_update: [:favorites_count, :retweets_count, :reactions_count])
end
# Destroys Tweets from database. This method is supposed to be used from collector daemon.
# @param [Array<Hash>] array An array of Streaming API delete events.
def destroy_bulk_from_json(array)
ids = array.map {|json| json[:delete][:status][:id] }
self.where(id: ids).delete_all
Favorite.where(tweet_id: ids).delete_all
Retweet.where(tweet_id: ids).delete_all
end
# Imports a Tweet from Twitter REST API.
# If the client is not specified, An random account will be selected from database.
# @param [Integer] id Target status ID.
# @param [Twitter::REST::Client] client The Twitter::REST::Client to be used.
# @return [Tweet] The Tweet instance imported.
def import_from_twitter(id, client = nil)
client ||= Account.random.client
st = client.status(id)
self.create_bulk_from_json([st.attrs])
User.create_or_update_from_json(st.attrs[:user])
tweet = self.find(st.id)
tweet.update(text: extract_entities(st.attrs),
source: st.attrs[:source],
in_reply_to_id: (tweet.in_reply_to_id || st.attrs[:in_reply_to_status_id]))
nt = tweet
nt = self.build_from_json(client.status(nt.in_reply_to_id).attrs).save! while nt.in_reply_to_id && !nt.in_reply_to
tweet.reload
end
# Parses /\d+[dwmy]/ style query and returns recent tweets (Relation) in specified period.
# @note When nil or unparsable string are specified, this method does nothing.
# @param [String] param
# @return [ActiveRecord::Relation]
def parse_recent(param)
match = param.to_s.match(/^(\d+)([a-z])$/)
if match
n = match[1].to_i
case match[2]
when "d" then recent(n.days)
when "w" then recent(n.weeks)
when "m" then recent(n.months)
when "y" then recent(n.years)
end
else
self
end
end
# Filters tweets with original query string.
# @param [String] query
# @return [ActiveRecord::Relation]
def filter_by_query(query)
strings = []
query = query.gsub(/"((?:\\"|[^"])*?)"/) {|m| strings << $1; "##{strings.size - 1}" }
escape_text = -> str do
str.gsub(/#(\d+)/) { strings[$1.to_i] }
.gsub(/(_|%)/) {|x| "\\" + x }
.gsub("*", "%")
.gsub("?", "_")
end
parse_condition = ->(scoped, token) do
positive = !token.slice!(/^[-!]/)
where_args = case token
when /^(?:user|from):([A-Za-z0-9_]{1,20})$/
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 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 snowflake_min(time)
(time.to_datetime.to_i * 1000 - 1288834974657) << 22
end
end
# Returns the URI of the tweet on twitter.com.
# @return [String] The URI.
def twitter_url
"https://twitter.com/#{user.screen_name}/status/#{self.id}"
end
# Searches the ancestors of this Tweet recursively up to specified level.
# @param [Integer] max_level
# @return [Array<Tweet>] The search result.
def reply_ancestors(max_level = Float::INFINITY)
nodes = []
node = self
level = 0
while level < max_level && node.in_reply_to
nodes << (node = node.in_reply_to)
level += 1
end
nodes.reverse
end
# Searches the descendants of this Tweet recursively up to specified level.
# @param [Integer] max_level
# @return [Array<Tweet>] The search result.
def reply_descendants(max_level = Float::INFINITY)
nodes = []
c_nodes = [self]
level = 0
while level < max_level && c_nodes.size > 0
nodes.concat(c_nodes.map! {|node| node.replies }.flatten!)
level += 1
end
nodes.sort_by(&:id)
end
end
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