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<?php |
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namespace Digia\GraphQL\Type\Definition; |
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use Digia\GraphQL\Error\InvariantException; |
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use function Digia\GraphQL\Type\isAssocArray; |
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use function Digia\GraphQL\Type\resolveThunk; |
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use function Digia\GraphQL\Util\invariant; |
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use function Digia\GraphQL\Util\toString; |
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trait FieldsTrait |
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{ |
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/** |
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* Fields can be defined either as an array or as a thunk. |
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* Using thunks allows for cross-referencing of fields. |
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* |
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* @var array|callable |
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*/ |
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protected $fieldsOrThunk; |
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/** |
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* A key-value map over field names and their corresponding field instances. |
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* |
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* @var Field[] |
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*/ |
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protected $fieldMap; |
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/** |
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* @return null|string |
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*/ |
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abstract public function getName(): ?string; |
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/** |
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* @param string $fieldName |
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* @return Field|null |
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* @throws InvariantException |
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*/ |
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public function getField(string $fieldName): ?Field |
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{ |
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return $this->getFields()[$fieldName] ?? null; |
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} |
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/** |
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* @return Field[] |
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* @throws InvariantException |
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*/ |
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public function getFields(): array |
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{ |
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// Fields are built lazily to avoid concurrency issues. |
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if (!isset($this->fieldMap)) { |
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$this->fieldMap = $this->buildFieldMap($this->fieldsOrThunk); |
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} |
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return $this->fieldMap; |
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} |
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/** |
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* @param array|callable $fieldsOrThunk |
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* @return array |
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* @throws InvariantException |
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*/ |
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protected function buildFieldMap($fieldsOrThunk): array |
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{ |
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$fields = resolveThunk($fieldsOrThunk); |
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invariant( |
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isAssocArray($fields), |
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\sprintf( |
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'%s fields must be an associative array with field names as key or a callable which returns such an array.', |
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$this->getName() |
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) |
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); |
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$fieldMap = []; |
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foreach ($fields as $fieldName => $fieldConfig) { |
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invariant( |
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\is_array($fieldConfig), |
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\sprintf('%s.%s field config must be an array', $this->getName(), $fieldName) |
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); |
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invariant( |
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!isset($fieldConfig['isDeprecated']), |
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\sprintf( |
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'%s.%s should provide "deprecationReason" instead of "isDeprecated".', |
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$this->getName(), |
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$fieldName |
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) |
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); |
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if (isset($fieldConfig['resolve'])) { |
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invariant( |
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null === $fieldConfig['resolve'] || \is_callable($fieldConfig['resolve']), |
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\sprintf( |
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'%s.%s field resolver must be a function if provided, but got: %s', |
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$this->getName(), |
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$fieldName, |
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toString($fieldConfig['resolve']) |
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) |
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); |
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} |
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$fieldMap[$fieldName] = new Field( |
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$fieldName, |
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$fieldConfig['description'] ?? null, |
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$fieldConfig['type'] ?? null, |
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$fieldConfig['args'] ?? [], |
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$fieldConfig['resolve'] ?? null, |
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$fieldConfig['subscribe'] ?? null, |
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$fieldConfig['deprecationReason'] ?? null, |
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$fieldConfig['astNode'] ?? null |
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); |
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} |
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return $fieldMap; |
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} |
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} |
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digiaonline /
graphql-php
