When rendering a number, you want to pretty up the string coming from #to_s:

• Render 0.0 as 0
• Sometimes require a minimum number of digits after the decimal separator
• Change the decimal separator from . to , in some European countries
• Render a dash if the given amount is nil

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The attached helper that does just that. Some usage examples with their resulting strings:

Rendering money amounts

If your amounts are Western hemisphere money amounts, you want some additional prettifications on top of that:

• Always use a minimum precision of 2
• Render a currency symbol after the string

A second helper method in the attached file does just that. Some usage examples with their resulting strings: