method
average
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Class: ActiveRecord::Calculations
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average(column_name)
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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lawitschka -
February 15, 2011 - (v3.0.0)
0 thanks
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.