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graphql-php/docs/best-practices.md
Vladimir Razuvaev d3580e959e Moved Schema to GraphQL\Type namespace (but preserved BC)
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Config Validation

Defining types using arrays may be error-prone, but graphql-php provides config validation tool to report when config has unexpected structure.

This validation tool is disabled by default because it is time-consuming operation which only makes sense during development.

To enable validation - call: GraphQL\Type\Definition\Config::enableValidation(); in your bootstrap but make sure to restrict it to debug/development mode only.

Type Registry

graphql-php expects that each type in Schema is presented by single instance. Therefore if you define your types as separate PHP classes you need to ensure that each type is referenced only once.

Technically you can create several instances of your type (for example for tests), but GraphQL\Type\Schema will throw on attempt to add different instances with the same name.

There are several ways to achieve this depending on your preferences. We provide reference implementation below that introduces TypeRegistry class: