class FollowSuggestion def self.get(for_account_id, limit = 6) neo = Neography::Rest.new query = <(b)-[:follows]->(c) WHERE a <> c AND NOT (a)-[:follows]->(c) RETURN DISTINCT c.account_id, count(b), c.nodeRank ORDER BY count(b) DESC, c.nodeRank DESC LIMIT {limit} END results = neo.execute_query(query, id: for_account_id, limit: limit) return fallback(for_account_id, limit) if results.empty? || results['data'].empty? map_to_accounts(for_account_id, results) rescue Neography::NeographyError, Excon::Error::Socket => e Rails.logger.error e return [] end private def self.fallback(for_account_id, limit) neo = Neography::Rest.new query = 'MATCH (a) WHERE a.account_id <> {id} RETURN a.account_id ORDER BY a.nodeRank DESC LIMIT {limit}' results = neo.execute_query(query, id: for_account_id, limit: limit) map_to_accounts(for_account_id, results) rescue Neography::NeographyError, Excon::Error::Socket => e Rails.logger.error e return [] end def self.map_to_accounts(for_account_id, results) return [] if results.empty? || results['data'].empty? account_ids = results['data'].map(&:first) blocked_ids = Block.where(account_id: for_account_id).pluck(:target_account_id) accounts_map = Account.where(id: account_ids - blocked_ids).map { |a| [a.id, a] }.to_h account_ids.map { |id| accounts_map[id] }.compact end end