Ruby on Rails - change an existing columns type in ruby on rails - ruby on rails tutorial - rails guides - rails tutorial - ruby rails



To modify an existing column in Rails with a migration, run the below command:

class AddDetailsToUsers < ActiveRecord::Migration[5.0]
  def change
    add_column :users, :admin, :boolean, default: false
  end
end
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  • This will create a new migration file in db/migration directory (if it doesn’t exist already), which will contain the file prefixed with timestamp and migration file name which contains the below content:
def change
  change_column(:table_name, :column_name, :new_type)
end
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A longer and safer method

  • The above code prevents the user from ever rolling back the migration.
  • We can avoid this problem by splitting the change method into separate up and down methods:
def up
  change_column :my_table, :my_column, :new_type
end

def down
  change_column :my_table, :my_column, :old_type
end
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