discourse/lib/freedom_patches/active_record_base.rb

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class ActiveRecord::Base
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# Execute SQL manually
def self.exec_sql(*args)
conn = ActiveRecord::Base.connection
sql = ActiveRecord::Base.send(:sanitize_sql_array, args)
conn.execute(sql)
end
def self.exec_sql_row_count(*args)
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exec_sql(*args).cmd_tuples
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end
# exists fine in rails4
unless rails4?
# note: update_attributes still spins up a transaction this can cause contention
# this method performs the raw update sidestepping the locking
# exists in rails 4
def update_columns(hash)
self.class.where(self.class.primary_key => self.id).update_all(hash)
hash.each do |k,v|
raw_write_attribute k, v
end
end
end
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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
#
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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# Support for psql. If we want to support multiple RDBMs in the future we can
# split this.
def exec_sql_row_count(*args)
exec_sql(*args).cmd_tuples
end
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end