56 lines
1.7 KiB
Ruby
56 lines
1.7 KiB
Ruby
class ActiveRecord::Base
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# Handle PG::UniqueViolation as well due to concurrency
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# find_or_create does find_by(hash) || create!(hash)
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# in some cases find will not find and multiple creates will be called
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#
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# note: Rails 6 has: https://github.com/rails/rails/blob/c83e30da27eafde79164ecb376e8a28ccc8d841f/activerecord/lib/active_record/relation.rb#L171-L201
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# This means that in Rails 6 we would either use:
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#
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# create_or_find_by! (if we are generally creating)
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#
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# OR
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#
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# find_by(hash) || create_or_find_by(hash) (if we are generally finding)
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def self.find_or_create_by_safe!(hash)
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begin
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find_or_create_by!(hash)
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rescue PG::UniqueViolation, ActiveRecord::RecordNotUnique
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# try again cause another transaction could have passed by now
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find_or_create_by!(hash)
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end
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end
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# Execute SQL manually
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def self.exec_sql(*args)
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Discourse.deprecate("exec_sql should not be used anymore, please use DB.exec or DB.query instead!")
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conn = ActiveRecord::Base.connection
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sql = ActiveRecord::Base.send(:sanitize_sql_array, args)
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conn.raw_connection.async_exec(sql)
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end
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def exec_sql(*args)
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ActiveRecord::Base.exec_sql(*args)
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end
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# Executes the given block +retries+ times (or forever, if explicitly given nil),
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# catching and retrying SQL Deadlock errors.
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#
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# Thanks to: http://stackoverflow.com/a/7427186/165668
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#
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def self.retry_lock_error(retries = 5, &block)
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begin
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yield
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rescue ActiveRecord::StatementInvalid => e
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if e.message =~ /deadlock detected/ && (retries.nil? || retries > 0)
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retry_lock_error(retries ? retries - 1 : nil, &block)
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else
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raise e
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end
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end
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end
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end
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