mastodon-glitch/app/models/account_suggestions/friends_of_friends_source.rb

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# frozen_string_literal: true
class AccountSuggestions::FriendsOfFriendsSource < AccountSuggestions::Source
def get(account, limit: 10)
Account.find_by_sql([<<~SQL.squish, { id: account.id, limit: limit }]).map { |row| [row.id, key] }
WITH first_degree AS (
SELECT target_account_id
FROM follows
JOIN accounts AS target_accounts ON follows.target_account_id = target_accounts.id
WHERE account_id = :id
AND NOT target_accounts.hide_collections
)
SELECT accounts.id, COUNT(*) AS frequency
FROM accounts
JOIN follows ON follows.target_account_id = accounts.id
JOIN account_stats ON account_stats.account_id = accounts.id
LEFT OUTER JOIN follow_recommendation_mutes ON follow_recommendation_mutes.target_account_id = accounts.id AND follow_recommendation_mutes.account_id = :id
WHERE follows.account_id IN (SELECT * FROM first_degree)
AND NOT EXISTS (SELECT 1 FROM follows f WHERE f.target_account_id = follows.target_account_id AND f.account_id = :id)
AND follows.target_account_id <> :id
AND accounts.discoverable
AND accounts.suspended_at IS NULL
AND accounts.silenced_at IS NULL
AND accounts.moved_to_account_id IS NULL
AND follow_recommendation_mutes.target_account_id IS NULL
GROUP BY accounts.id, account_stats.id
ORDER BY frequency DESC, account_stats.followers_count ASC
LIMIT :limit
SQL
end
private
def key
:friends_of_friends
end
end