method

to_ary

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What's this?

to_ary() public

+Array#flatten+ will call #to_ary (recursively) on each of the elements of the array, and then rescues from the possible NoMethodError. If those elements are +ActiveRecord::Base+‘s, then this triggers the various method_missing's that we have, which significantly impacts upon performance.

So we can avoid the method_missing hit by explicitly defining #to_ary as nil here.

See also tenderlovemaking.com/2011/06/28/til-its-ok-to-return-nil-from-to_ary.html

Show source

# File activerecord/lib/active_record/core.rb, line 747
      def to_ary
        nil
      end

to_ary

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