Migración de rails db

Ejemplos de código

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rails g migración añadir columnas

$ rails generate migration AddDetailsToProducts part_number:string price:decimal
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cómo crear carriles de migración

rails g migration AddPartNumberToProducts
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activerecord agregar columna

class AddPartNumberToProducts < ActiveRecord::Migration[6.0]
  def change
    add_column :products, :part_number, :string
  end
end
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uso de SQL en la migración de rails

def change
  execute <<-SQL
    UPDATE table1
    SET column1 = "value"
  SQL
end
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migración de ruby on rails db

rails db:migrate
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rials db down

bin/rails db:migrate:down VERSION=YYYYMMDDHHMMSS

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