method
down
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Class: MigrationContext
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down(target_version = nil)
public
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# File activerecord/lib/active_record/migration.rb, line 1064 def down(target_version = nil) selected_migrations = if block_given? migrations.select { |m| yield m } else migrations end Migrator.new(:down, selected_migrations, schema_migration, target_version).migrate end