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Class: ChangeGenerator
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# File railties/lib/rails/generators/rails/db/system/change/change_generator.rb, line 21 def initialize(*) super unless DATABASES.include?(options[:to]) raise Error, "Invalid value for --to option. Supported preconfigurations are: #{DATABASES.join(", ")}." end opt = options.dup opt[:database] ||= opt[:to] self.options = opt.freeze end