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Type System

Types

Types can be define 3 different ways:

  1. The configuration way

    Creating this file extension .types.yml in src/*Bundle/Resources/config/graphql or app/config/graphql. See the different possible types:

    You can also define custom dirs using config:

    overblog_graphql:
        definitions:
            mappings:
                # auto_discover: false # to disable bundles and root dir auto discover
                types:
                    -
                        type: yaml # or graphql or annotation null
                        dir: "%kernel.root_dir%/.../mapping" # sub directories are also searched
                        # suffix: .types # use to change default file suffix
                    -
                        types: [yaml, graphql] # to include different types from the same dir
                        dir: "%kernel.root_dir%/.../mapping"
  2. The PHP way

    You can also declare PHP types (any subclass of GraphQL\Type\Definition\Type) in src/*Bundle/GraphQL or app/GraphQL they will be auto discover (thanks to auto mapping). Auto map classes are accessible by service id (example: AppBundle\GraphQL\Type\DateTimeType), you can also alias a type by implementing Overblog\GraphQLBundle\Definition\Resolver\AliasedInterface that returns an array of aliases.

    here an example:

    <?php
    
    namespace App\GraphQL\Type;
    
    use Overblog\GraphQLBundle\Definition\Resolver\AliasedInterface;
    use GraphQL\Type\Definition\ScalarType;
    
    class DateTimeType extends ScalarType implements AliasedInterface
    {
        /**
         * {@inheritdoc}
         */
        public static function getAliases(): array
        {
            return ['DateTime', 'Date'];
        }
        // ...
    }

    Here an example of how this can be done with DI autoconfigure:

    services:
        _defaults:
            autoconfigure: true
    
        App\Type\:
            resource: '../src/Type'

    Note:

    • Types are lazy loaded so when using Symfony DI autoconfigure or this bundle auto mapping, the only access to type is FQCN (or aliases if implements the aliases interface).
    • When using service id as FQCN in yaml definition, backslashes must be correctly escaped,
  3. The service way

    Creating a service tagged overblog_graphql.type

    services:
        AppBundle\GraphQL\Type\DateTime:
            # only for sf < 3.3
            #class: AppBundle\GraphQL\Type\DateTime
            tags:
                - { name: overblog_graphql.type, alias: DateTime }