56 lines
1.6 KiB
Ruby
56 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module BackgroundMigration
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# Base class for background migration for rename/type changes.
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class CleanupConcurrentSchemaChange
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include Database::MigrationHelpers
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# table - The name of the table the migration is performed for.
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# old_column - The name of the old (to drop) column.
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# new_column - The name of the new column.
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def perform(table, old_column, new_column)
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return unless column_exists?(table, new_column) && column_exists?(table, old_column)
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rows_to_migrate = define_model_for(table)
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.where(new_column => nil)
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.where
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.not(old_column => nil)
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if rows_to_migrate.any?
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BackgroundMigrationWorker.perform_in(
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RESCHEDULE_DELAY,
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self.class.name,
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[table, old_column, new_column]
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)
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else
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cleanup_concurrent_schema_change(table, old_column, new_column)
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end
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end
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def cleanup_concurrent_schema_change(_table, _old_column, _new_column)
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raise NotImplementedError
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end
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# These methods are necessary so we can re-use the migration helpers in
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# this class.
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def connection
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ActiveRecord::Base.connection
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end
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def method_missing(name, *args, &block)
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connection.__send__(name, *args, &block) # rubocop: disable GitlabSecurity/PublicSend
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end
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def respond_to_missing?(*args)
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connection.respond_to?(*args) || super
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end
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def define_model_for(table)
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Class.new(ActiveRecord::Base) do
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self.table_name = table
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end
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end
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end
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end
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end
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