Trying to inject `id` field on every `selection_set`

[nrbnlulu]

Hi, I'm trying to add id field on every selection set (like relay does I think)
Tried the below code based on #149.

class IDInjectionVisitor(visitor.Visitor):
    def has_id_field(self, selection_set: Tuple[gql_lang.SelectionNode]) -> bool:
        for field in selection_set:
            assert isinstance(field, gql_lang.FieldNode)
            if field.name.value == 'id':
                return True
        return False

    ID_FIELD_NODE = gql_lang.FieldNode(name=gql_lang.NameNode(value='id'))
    
    def enter(self, node, key, parent, path, ancestors):
        if is_operation_def_node(parent):
            return None
        if selection_set := is_selection_set(node):
            if not self.has_id_field(selection_set.selections):
                selection_set.selections = (*selection_set.selections, self.ID_FIELD_NODE)

This causes this error:

../../qtgql/codegen/introspection.py:229: in parse_queries
    if errors := graphql.validate(self.schema_definition, operations):
../../.venv/lib/python3.10/site-packages/graphql/validation/validate.py:86: in validate
    visit(document_ast, TypeInfoVisitor(type_info, ParallelVisitor(visitors)))
../../.venv/lib/python3.10/site-packages/graphql/language/visitor.py:261: in visit
    result = visit_fn(node, key, parent, path, ancestors)
../../.venv/lib/python3.10/site-packages/graphql/utilities/type_info.py:310: in enter
    result = fn(node, *args)
../../.venv/lib/python3.10/site-packages/graphql/language/visitor.py:343: in enter
    result = fn(node, *args)
../../.venv/lib/python3.10/site-packages/graphql/validation/rules/unique_argument_names.py:22: in enter_field
    self.check_arg_uniqueness(node.arguments)
../../.venv/lib/python3.10/site-packages/graphql/validation/rules/unique_argument_names.py:28: in check_arg_uniqueness
    seen_args = group_by(argument_nodes, attrgetter("name.value"))
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

items = None, key_fn = operator.attrgetter('name.value')

    def group_by(items: Collection[T], key_fn: Callable[[T], K]) -> Dict[K, List[T]]:
        """Group an unsorted collection of items by a key derived via a function."""
        result: Dict[K, List[T]] = defaultdict(list)
>       for item in items:
E       TypeError: 'NoneType' object is not iterable

Note that the I am injecting has no location would that be a problme?

[nrbnlulu]

Solution was to add blank tuples in arguments and directives

 ID_SELECTION_NODE = gql_lang.FieldNode(
        name=gql_lang.NameNode(value="id"), arguments=(), directives=()
    )