Point
Model.reset_column_information
It makes AR reload the column information.
Example
class ChangeColumnTypeInCompanies < ActiveRecord::Migration[6.0]
def up
add_column :companies, :r_id, :string, comment: 'registration_id', after: :id
# マイグレーション中にデータ移行するので、直前に足したカラム情報を読み込む
# https://github.com/rails/rails/blob/v5.1.4/activerecord/lib/active_record/migration.rb#L409-L424
Company.reset_column_information
Company.find_each {|company|
company.update(r_id: company.registration_number&.to_s)
}
remove_column :companies, :registration_number
end
def down
add_column :companies, :registration_number, :integer
Company.reset_column_information
Company.find_each {|company|
company.update(registration_number: company.r_id&.to_s)
}
remove_column :companies, :r_id
end
end
Top comments (1)
I've been trying to avoid reset_column_information in favour of
executewhere I can. Mostly because it's faster, but also because it'll work if theCompanymodel ever changes in the future.