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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,13 @@ protected function getDerivativeDefinitionsFromFieldDefinition(FieldDefinitionIn
if (count($propertyDefinitions) === 1) {
$propertyDefinition = reset($propertyDefinitions);
$derivative['type'] = $propertyDefinition->getDataType();

// Workaround for BigInt field types (integer with size = big)
// Treat as String instead of Integer in GraphQL, because of lack support for 64 bit integers
// More info: https://github.com/graphql/graphql-spec/issues/73
if($propertyDefinition->getDataType() == 'integer' && $itemDefinition->getSetting('size') == 'big') {
$derivative['type'] = 'string';
}
$derivative['property'] = key($propertyDefinitions);
}
else {
Expand Down