Calculates the sum of
values on a given column. The value is returned with the same data type of
the column, 0 if there’s no row. See calculate for
examples with options.
# File activerecord/lib/active_record/relation/calculations.rb, line 92
def sum(*args)
if block_given?
self.to_a.sum(*args) {|*block_args| yield(*block_args)}
else
calculate(:sum, *args)
end
end
