ejemplo de cambio de raíles de columna
def change
change_column(:table_name, :column_name, :new_type)
end
renombrar columna en db rails
class RenameTitleToNameInTasks < ActiveRecord::Migration[6.0]
def up
rename_column :tasks, :title, :name
end
def down
rename_column :tasks, :name, :title
end
end