Converting a decimal to price format in Ruby

Question

Hey I am using the ruby on rails framework and I have a price variable that is a decimal. Naturally values like $39.99 is fine but when the price is $39.90 my app shows the price as $39.9 How could I change that.

My view

%b price

= @product.price

Answer 1

rails includes the number_to_currency(@product.price) helper. Little simpler and easier to remember.

Answer 2

The standard answer here is to use sprintf.

sprintf("$%2.2f", @product.price)

This will format your number with a leading dollar sign, then the number to two decimal places.