A VCR matcher that matches a request where the JSON body is identical to another, except for some keys

vcr_body_as_json_excluding_matcher.rb

# Match the JSON body of the request, ignoring some specified keys.
#
# Usage:
#   VCR.use_cassette(
#     'my_request',
#     match_requests_on: [:host, :path, body_as_json_excluding(:timestamp)]
#   )
#
# See also: body_as_json
def body_as_json_excluding(*keys)
  lambda do |r1, r2|
    begin
      keys = keys.map(&:to_s)
      JSON.parse(r1.body).except(*keys) == JSON.parse(r2.body).except(*keys)
    rescue JSON::ParserError
      false
    end
  end
end