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- # frozen_string_literal: true
- class Trends::Statuses < Trends::Base
- PREFIX = 'trending_statuses'
- self.default_options = {
- threshold: 5,
- review_threshold: 3,
- score_halflife: 2.hours.freeze,
- decay_threshold: 0.3,
- }
- class Query < Trends::Query
- def filtered_for!(account)
- @account = account
- self
- end
- def filtered_for(account)
- clone.filtered_for!(account)
- end
- private
- def apply_scopes(scope)
- if @account.nil?
- scope
- else
- scope.not_excluded_by_account(@account).not_domain_blocked_by_account(@account)
- end
- end
- end
- def register(status, at_time = Time.now.utc)
- add(status.proper, status.account_id, at_time) if eligible?(status.proper)
- end
- def add(status, _account_id, at_time = Time.now.utc)
- # We rely on the total reblogs and favourites count, so we
- # don't record which account did the what and when here
- record_used_id(status.id, at_time)
- end
- def query
- Query.new(key_prefix, klass)
- end
- def refresh(at_time = Time.now.utc)
- statuses = Status.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq).includes(:account, :media_attachments)
- calculate_scores(statuses, at_time)
- end
- def request_review
- statuses = Status.where(id: currently_trending_ids(false, -1)).includes(:account)
- statuses.filter_map do |status|
- next unless would_be_trending?(status.id) && !status.trendable? && status.requires_review_notification?
- status.account.touch(:requested_review_at)
- status
- end
- end
- protected
- def key_prefix
- PREFIX
- end
- def klass
- Status
- end
- private
- def eligible?(status)
- status.public_visibility? && status.account.discoverable? && !status.account.silenced? && status.spoiler_text.blank? && !status.sensitive? && !status.reply?
- end
- def calculate_scores(statuses, at_time)
- global_items = []
- locale_items = Hash.new { |h, key| h[key] = [] }
- statuses.each do |status|
- expected = 1.0
- observed = (status.reblogs_count + status.favourites_count).to_f
- score = begin
- if expected > observed || observed < options[:threshold]
- 0
- else
- ((observed - expected)**2) / expected
- end
- end
- decaying_score = score * (0.5**((at_time.to_f - status.created_at.to_f) / options[:score_halflife].to_f))
- next unless decaying_score >= options[:decay_threshold]
- global_items << { score: decaying_score, item: status }
- locale_items[status.language] << { account_id: status.account_id, score: decaying_score, item: status } if valid_locale?(status.language)
- end
- replace_items('', global_items)
- Trends.available_locales.each do |locale|
- replace_items(":#{locale}", locale_items[locale])
- end
- end
- def filter_for_allowed_items(items)
- # Show only one status per account, pick the one with the highest score
- # that's also eligible to trend
- items.group_by { |item| item[:account_id] }.values.filter_map { |account_items| account_items.select { |item| item[:item].trendable? && item[:item].account.discoverable? }.max_by { |item| item[:score] } }
- end
- def would_be_trending?(id)
- score(id) > score_at_rank(options[:review_threshold] - 1)
- end
- end
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