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