Allow lazy root types (query, mutation, subscription)

[ruudk]

This makes it possible to create a schema with the root types lazy. This way, only when the root type is needed, the type will be initialized by calling the callable.

Why would a Schema have an instance of the mutation and subscription root type, when it's only serving a query operation? Visa versa. That does not make sense to me.

This is in line with the rest of the codebase, where all the types can be passed as lazy.

$schema = new Schema([
    'query' => fn () => $query,
    'mutation' => fn () => $mutation,
    'subscription' => fn () => $subscription,
]);

Alternative solution

An alternative solution could be to allow passing a string with the name of the root type. When needed, the Schema will call the typeLoader with the given name. For example:

new Schema([
    'query' => 'Query',
    'typeLoader' => $typeLoader,
]);

[shmax]

Nice concept. Don't know why I didn't think of it when I was working on this stuff. 👍

[ruudk]

@spawnia nice, added some tweaks as comments

[spawnia]

Thank you, released with https://github.com/webonyx/graphql-php/releases/tag/v15.6.0.

[stayallive]

Very nice 🤘

[N-Silbernagel]

Is it possible to leverage this lazy loading using the schema definition language?

[spawnia]

Is it possible to leverage this lazy loading using the schema definition language?

Sure, depends on the implementation.