JSONAPI testing with rspec and Airborne

Hello i have problem with testing JSONAPI with rspec and airborne. GET model below

GET

Im testing it this way Test

Rspec output:

Failures: 1) GET on /contacts should validate types Failure/Error: expect_json('books.0', title: 'The Great Escape')

 Airborne::PathError:
   Expected NilClass
   to be an object with property 0
 # /home/robert/.rvm/gems/ruby-2.4.0/gems/airborne-0.2.5/lib/airborne/path_matcher.rb:21:in `rescue in block in get_by_path'
 # /home/robert/.rvm/gems/ruby-2.4.0/gems/airborne-0.2.5/lib/airborne/path_matcher.rb:18:in `block in get_by_path'
 # /home/robert/.rvm/gems/ruby-2.4.0/gems/airborne-0.2.5/lib/airborne/path_matcher.rb:9:in `each'
 # /home/robert/.rvm/gems/ruby-2.4.0/gems/airborne-0.2.5/lib/airborne/path_matcher.rb:9:in `each_with_index'
 # /home/robert/.rvm/gems/ruby-2.4.0/gems/airborne-0.2.5/lib/airborne/path_matcher.rb:9:in `get_by_path'
 # /home/robert/.rvm/gems/ruby-2.4.0/gems/airborne-0.2.5/lib/airborne/request_expectations.rb:137:in `call_with_path'
 # /home/robert/.rvm/gems/ruby-2.4.0/gems/airborne-0.2.5/lib/airborne/request_expectations.rb:18:in `expect_json'
 # ./book_resource.rb:10:in `block (2 levels) in <top (required)>'
 # ------------------
 # --- Caused by: ---
 # NoMethodError:
 #   undefined method `[]' for nil:NilClass
 #   /home/robert/.rvm/gems/ruby-2.4.0/gems/airborne-0.2.5/lib/airborne/path_matcher.rb:57:in `process_json'

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