Fix Nested Resources example

[votintsev]

There was an error using a variable.

[codecov-io]

Codecov Report

Merging #34 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   98.61%   98.61%           
=======================================
  Files           6        6           
  Lines         216      216           
=======================================
  Hits          213      213           
  Misses          3        3

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