def is_valid_nonreserved_name(name: str) -> bool:
"""Check if input is a valid, non-reserved GraphQL name.
A GraphQL name is valid iff it consists of only alphanumeric characters and underscores and
does not start with a numeric character. It is non-reserved (i.e. not reserved for GraphQL
internal use) if it does not start with double underscores.
Args:
name: to be checked
Returns:
True iff name is a valid, non-reserved GraphQL type name.
"""
return bool(re_name.match(name)) and not name.startswith("__")
def check_type_name_is_valid(name):
"""Check if input is a valid, nonreserved GraphQL type name.
Args:
name: str
Raises:
- InvalidTypeNameError if the name doesn't consist of only alphanumeric characters and
underscores, starts with a numeric character, or starts with double underscores
"""
if not isinstance(name, str):
raise InvalidTypeNameError('Name "{}" is not a string.'.format(name))
if not re_name.match(name):
raise InvalidTypeNameError('"{}" is not a valid GraphQL name.'.format(name))
if name.startswith("__"):
raise InvalidTypeNameError(
'"{}" starts with two underscores, which is reserved for '
"GraphQL internal use and is not allowed.".format(name)
)
def _get_fields_for_class(
schema_graph, graphql_types, field_type_overrides, hidden_classes, cls_name
):
"""Return a dict from field name to GraphQL field type, for the specified graph class."""
properties = schema_graph.get_element_by_class_name(cls_name).properties
# Add leaf GraphQL fields (class properties).
all_properties = {}
for property_name, property_obj in six.iteritems(properties):
if re_name.match(property_name):
all_properties[property_name] = property_obj.type
else:
warnings.warn(
"Ignoring property {} of class {} with invalid name. "
"Property names must match /{}/.".format(property_name, cls_name, re_name)
)
collections_of_non_graphql_scalars = {
property_name
for property_name, graphql_type in six.iteritems(all_properties)
if (
isinstance(strip_non_null_from_type(graphql_type), GraphQLList)
and not isinstance(strip_non_null_from_type(graphql_type.of_type), GraphQLScalarType)
)
}
if len(collections_of_non_graphql_scalars) > 0:
warnings.warn(
"The fields {} of class {} were ignored since they are GraphQLLists of "
"non-GraphQLScalarTypes. GraphQLLists of non-GraphQLScalarTypes are not "
"currently supported in the GraphQLSchema.".format(
collections_of_non_graphql_scalars, cls_name
)
)
# Filter collections of non-GraphQLScalarTypes. They are currently not supported.
result = {
property_name: graphql_type
for property_name, graphql_type in six.iteritems(all_properties)
if property_name not in collections_of_non_graphql_scalars
}
# Add edge GraphQL fields.
schema_element = schema_graph.get_element_by_class_name(cls_name)
outbound_edges = (
(
"out_{}".format(out_edge_name),
schema_graph.get_element_by_class_name(out_edge_name).base_out_connection,
)
for out_edge_name in schema_element.out_connections
)
inbound_edges = (
(
"in_{}".format(in_edge_name),
schema_graph.get_element_by_class_name(in_edge_name).base_in_connection,
)
for in_edge_name in schema_element.in_connections
)
for field_name, to_type_name in chain(outbound_edges, inbound_edges):
edge_endpoint_type_name = None
subclasses = schema_graph.get_subclass_set(to_type_name)
to_type_abstract = schema_graph.get_element_by_class_name(to_type_name).abstract
if not to_type_abstract and len(subclasses) > 1:
# If the edge endpoint type has no subclasses, it can't be coerced into any other
# type. If the edge endpoint type is abstract (an interface type), we can already
# coerce it to the proper type with a GraphQL fragment. However, if the endpoint
# type is non-abstract and has subclasses, we need to return its subclasses as an
# union type. This is because GraphQL fragments cannot be applied on concrete
# types, and GraphQL does not support inheritance of concrete types.
type_names_to_union = [
subclass for subclass in subclasses if subclass not in hidden_classes
]
if type_names_to_union:
edge_endpoint_type_name = _get_union_type_name(type_names_to_union)
else:
if to_type_name not in hidden_classes:
edge_endpoint_type_name = to_type_name
if edge_endpoint_type_name is not None:
# If we decided to not hide this edge due to its endpoint type being
# non-representable, represent the edge field as the GraphQL type
# List(edge_endpoint_type_name).
result[field_name] = GraphQLList(graphql_types[edge_endpoint_type_name])
for field_name, field_type in six.iteritems(field_type_overrides):
if field_name not in result:
raise AssertionError(
'Attempting to override field "{}" from class "{}", but the '
"class does not contain said field".format(field_name, cls_name)
)
else:
result[field_name] = field_type
return result
