How to format decimals

I need to format float like price for two decimal places and t开发者_JAVA百科housands spaces, like this: "1 082 233.00"

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Use number_to_currency or number_with_precision:

number_with_precision(1082233, :precision => 2,
                               :separator => '.',
                               :delimiter => ' ')
# => '1 082 233.00'

See the NumberHelper documentation for details.