average(column_name, options = {}) public

Calculates the average value on a given column. Returns nil if there’s no row. See calculate for examples with options.

Person.average('age') # => 35.8
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February 15, 2011 - (v3.0.0)
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No type cast to Float

In Rails 3 the returned value will be type cast to the column’s type and not Float. So when calculating average on a column the column’s type need to be float, the result will be truncated otherwise.