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migrations make developing a database driven application much much easier.
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Migrations can manage the evolution of a schema used by several physical databases.
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ActiveRecordMigration allow you to use Ruby to define changes to your database schema, making it possible to use a version control system to keep things synchronised with the actual code.
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Library aiding in handling of money.
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to migrate to production, the command is “rake environment RAILS_ENV=production migrate” - rake tries to migrate to development by default
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