discourse/lib/freedom_patches/active_record_base.rb

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