gistfile1.txt

# Numeric#nonzero? returns self if num is not zero, nil otherwise.
# This behavior is useful when chaining comparisons.

array.sort { |a, b| (a.foo <=> b.foo).nonzero? || (a.bar <=> b.bar) }

# Alternatively, consider #sort_by:

array.sort_by { |e| [e.foo, e.bar] }