cum se adaugă coloana la șinele de masă
rails g migration add_description_to_users description:string
#'g' means generate, the 'add' in 'add_description_to_users' tells
#Rails you want to add a column, the 'description' is the new column name,
#and the 'users' is the table you want to add it to, must be plural.
#After you've checked your migration to make sure its what you want...
rails db:migrate
rails g migration adaugă coloane
$ rails generate migration AddDetailsToProducts part_number:string price:decimal
modificați exemplul șinelor de coloană
def change
change_column(:table_name, :column_name, :new_type)
end