Support to child routes

[weierophinney]

I'm using child routes with success in apigility, but the zfcampus/zf-apigility-documentation package apparently don't support the child routes.

Notice: Undefined index: my.route/is-child in ./vendor/zfcampus/zf-apigility-documentation/src/ApiFactory.php on line 190

Someone have any solution ?

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Originally posted by @lucascampelo at zfcampus/zf-apigility-documentation#60