class Sequel::MigrationAlterTableReverser

    # File lib/sequel/extensions/migration.rb
242 def initialize
243   @actions = []
244 end

    # File lib/sequel/extensions/migration.rb
246 def reverse(&block)
247   instance_exec(&block)
248   actions = @actions.reverse
249   # Allow calling private methods as the reversing methods are private
250   Proc.new{actions.each{|a| send(*a)}}
251 end

    # File lib/sequel/extensions/migration.rb
255 def add_column(*args)
256   @actions << [:drop_column, args.first]
257 end

    # File lib/sequel/extensions/migration.rb
259 def add_constraint(*args)
260   name = args.first
261   name = name.is_a?(Hash) ? name[:name] : name
262   @actions << [:drop_constraint, name]
263 end

    # File lib/sequel/extensions/migration.rb
265 def add_foreign_key(key, table, *args)
266   @actions << [:drop_foreign_key, key, *args]
267 end

    # File lib/sequel/extensions/migration.rb
274 def add_index(*args)
275   @actions << [:drop_index, *args]
276 end

    # File lib/sequel/extensions/migration.rb
269 def add_primary_key(*args)
270   super if args.first.is_a?(Array)
271   @actions << [:drop_column, args.first]
272 end

    # File lib/sequel/extensions/migration.rb
280 def rename_column(name, new_name)
281   @actions << [:rename_column, new_name, name]
282 end

    # File lib/sequel/extensions/migration.rb
284 def set_column_allow_null(name, allow_null=true)
285   @actions << [:set_column_allow_null, name, !allow_null]
286 end

    # File lib/sequel/extensions/migration.rb
288 def set_column_not_null(name)
289   @actions << [:set_column_allow_null, name]
290 end