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class FollowSuggestion
def self.get(for_account_id, limit = 6)
neo = Neography::Rest.new
query = <<END
START a=node:account_index(Account={id})
MATCH (a)-[:follows]->(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)
if results.empty?
results = fallback(for_account_id, limit)
elsif results['data'].size < limit
results['data'] = (results['data'] + fallback(for_account_id, limit - results['data'].size)['data']).uniq
end
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
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 = <<END
START a=node:account_index(Account={id})
MATCH (b)
WHERE a <> b
AND NOT (a)-[:follows]->(b)
RETURN b.account_id
ORDER BY b.nodeRank DESC
LIMIT {limit}
END
neo.execute_query(query, id: for_account_id, limit: limit)
end
end
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