76 lines
2.3 KiB
Ruby
76 lines
2.3 KiB
Ruby
# rubocop:disable Lint/RescueException
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# Remove this monkey patch when we move to Rails 5.1, because the bug has been fixed in https://github.com/rails/rails/pull/26050.
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if Rails.gem_version >= Gem::Version.new("5.1")
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raise "Remove this monkey patch: #{__FILE__}"
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end
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module ActiveRecord
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module Locking
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module Optimistic
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# We overwrite this method because we don't want to have default value
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# for newly created records
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def _create_record(attribute_names = self.attribute_names, *) # :nodoc:
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super
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end
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def _update_record(attribute_names = self.attribute_names) #:nodoc:
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return super unless locking_enabled?
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return 0 if attribute_names.empty?
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lock_col = self.class.locking_column
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previous_lock_value = send(lock_col).to_i
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increment_lock
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attribute_names += [lock_col]
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attribute_names.uniq!
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begin
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relation = self.class.unscoped
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affected_rows = relation.where(
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self.class.primary_key => id,
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# Patched because when `lock_version` is read as `0`, it may actually be `NULL` in the DB.
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lock_col => previous_lock_value == 0 ? [nil, 0] : previous_lock_value
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).update_all(
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attributes_for_update(attribute_names).map do |name|
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[name, _read_attribute(name)]
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end.to_h
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)
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unless affected_rows == 1
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raise ActiveRecord::StaleObjectError.new(self, "update")
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end
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affected_rows
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# If something went wrong, revert the version.
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rescue Exception
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send(lock_col + '=', previous_lock_value)
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raise
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end
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end
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# This is patched because we need it to query `lock_version IS NULL`
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# rather than `lock_version = 0` whenever lock_version is NULL.
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def relation_for_destroy
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return super unless locking_enabled?
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column_name = self.class.locking_column
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super.where(self.class.arel_table[column_name].eq(self[column_name]))
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end
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end
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# This is patched because we want `lock_version` default to `NULL`
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# rather than `0`
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class LockingType
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def deserialize(value)
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super
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end
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def serialize(value)
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super
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end
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end
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end
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end
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