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Aug 19th, 2017
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  1. - Cuando se ejecuta ``rails g model Goal user:references`` rails hace lo siguiente:
  2. - Agrega una columna ``user_id`` a la tablas goals
  3. - Agrega una relación ``belongs_to :user`` al modelo Goal
  4. - Genera un puntero para una fila específica de goals apuntando a una fila correspondiente de users
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