Internal class used by the Sequel.migration DSL, part of the migration extension.
Creates a reversible migration. This is the same as creating the same block with up, but it also calls the block and attempts to create a down block that will reverse the changes made by the block.
There are no guarantees that this will work perfectly in all cases, but it should work for most common cases.
# File lib/sequel/extensions/migration.rb, line 115 def change(&block) migration.up = block migration.down = MigrationReverser.new.reverse(&block) end
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