741d0952b1
* Improve account counters handling * Use ActiveRecord::Base::sanitize_sql to pass values instead of interpolating them Keep using string interpolation for `key` as it is safe and using “ActiveRecord::Base::sanitize_sql_hash_for_assignment” would require stitching bits of SQL in a way that is not more easily checked for safety. * Add migration hook to catch PostgreSQL versions earlier than 9.5
89 lines
2.9 KiB
Ruby
89 lines
2.9 KiB
Ruby
# frozen_string_literal: true
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module AccountCounters
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extend ActiveSupport::Concern
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ALLOWED_COUNTER_KEYS = %i(statuses_count following_count followers_count).freeze
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included do
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has_one :account_stat, inverse_of: :account
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after_save :save_account_stat
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end
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delegate :statuses_count,
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:statuses_count=,
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:following_count,
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:following_count=,
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:followers_count,
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:followers_count=,
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:last_status_at,
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to: :account_stat
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# @param [Symbol] key
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def increment_count!(key)
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update_count!(key, 1)
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end
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# @param [Symbol] key
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def decrement_count!(key)
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update_count!(key, -1)
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end
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# @param [Symbol] key
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# @param [Integer] value
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def update_count!(key, value)
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raise ArgumentError, "Invalid key #{key}" unless ALLOWED_COUNTER_KEYS.include?(key)
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raise ArgumentError, 'Do not call update_count! on dirty objects' if association(:account_stat).loaded? && account_stat&.changed? && account_stat.changed_attribute_names_to_save == %w(id)
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value = value.to_i
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default_value = value.positive? ? value : 0
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# We do an upsert using manually written SQL, as Rails' upsert method does
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# not seem to support writing expressions in the UPDATE clause, but only
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# re-insert the provided values instead.
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# Even ARel seem to be missing proper handling of upserts.
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sql = if value.positive? && key == :statuses_count
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<<-SQL.squish
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INSERT INTO account_stats(account_id, #{key}, created_at, updated_at, last_status_at)
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VALUES (:account_id, :default_value, now(), now(), now())
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ON CONFLICT (account_id) DO UPDATE
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SET #{key} = account_stats.#{key} + :value,
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last_status_at = now(),
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lock_version = account_stats.lock_version + 1,
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updated_at = now()
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RETURNING id;
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SQL
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else
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<<-SQL.squish
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INSERT INTO account_stats(account_id, #{key}, created_at, updated_at)
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VALUES (:account_id, :default_value, now(), now())
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ON CONFLICT (account_id) DO UPDATE
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SET #{key} = account_stats.#{key} + :value,
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lock_version = account_stats.lock_version + 1,
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updated_at = now()
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RETURNING id;
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SQL
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end
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sql = AccountStat.sanitize_sql([sql, account_id: id, default_value: default_value, value: value])
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account_stat_id = AccountStat.connection.exec_query(sql)[0]['id']
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# Reload account_stat if it was loaded, taking into account newly-created unsaved records
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if association(:account_stat).loaded?
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account_stat.id = account_stat_id if account_stat.new_record?
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account_stat.reload
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end
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end
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def account_stat
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super || build_account_stat
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end
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private
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def save_account_stat
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return unless association(:account_stat).loaded? && account_stat&.changed?
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account_stat.save
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end
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end
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