def _map_attr_to_type_for_class(
cls: Type,
) -> Dict[attr.Attribute, Tuple[BuildableAttrFieldType, Optional[Type[Enum]]]]:
"""Helper function for _attribute_field_type_reference_for_class to map attributes
to their BuildableAttrFieldType for a class if the attributes of the class aren't
yet in the cached _class_structure_reference.
"""
attr_field_types: Dict[
attr.Attribute, Tuple[BuildableAttrFieldType, Optional[Type[Enum]]]
] = {}
for attribute in attr.fields_dict(cls).values():
if is_forward_ref(attribute):
attr_field_types[attribute] = (BuildableAttrFieldType.FORWARD_REF, None)
elif is_enum(attribute):
enum_cls = get_enum_cls(attribute)
if not enum_cls:
raise ValueError(
f"Did not find enum class for enum attribute [{attribute}]"
)
attr_field_types[attribute] = (BuildableAttrFieldType.ENUM, enum_cls)
elif is_date(attribute):
attr_field_types[attribute] = (BuildableAttrFieldType.DATE, None)
else:
attr_field_types[attribute] = (BuildableAttrFieldType.OTHER, None)
return attr_field_types
def schema_type_for_attribute(attribute: Any) -> str:
# Race and ethnicity fields are the only ones that support list form. These
# are converted to comma-separated lists stored as strings in BigQuery.
if is_enum(attribute) or is_list(attribute) or is_str(attribute):
return bigquery.enums.SqlTypeNames.STRING.value
if is_int(attribute):
return bigquery.enums.SqlTypeNames.INTEGER.value
if is_float(attribute):
return bigquery.enums.SqlTypeNames.FLOAT.value
if is_date(attribute):
return bigquery.enums.SqlTypeNames.DATE.value
if is_bool(attribute):
return bigquery.enums.SqlTypeNames.BOOLEAN.value
raise ValueError(f"Unhandled attribute type for attribute: {attribute}")
def build_from_dictionary(cls, build_dict: Dict[str, Any]) -> \
Optional['BuildableAttr']:
"""Builds a BuildableAttr with values from the given build_dict.
Given build_dict must contain all required fields, and cannot contain
any fields with attribute types of List or ForwardRef. Any date values
must be in the format 'YYYY-MM-DD' if they are present.
"""
if not attr.has(cls):
raise Exception("Parent class must be an attr class")
if not build_dict:
raise ValueError("build_dict cannot be empty")
cls_builder = cls.builder()
for field, attribute in attr.fields_dict(cls).items():
if field in build_dict:
if is_list(attribute):
raise ValueError("build_dict should be a dictionary of "
"flat values. Should not contain any "
f"lists: {build_dict}.")
if is_forward_ref(attribute):
# TODO(1886): Implement detection of non-ForwardRefs
# ForwardRef fields are expected to be references to other
# BuildableAttrs
raise ValueError("build_dict should be a dictionary of "
"flat values. Should not contain any "
f"ForwardRef fields: {build_dict}")
if is_enum(attribute):
value = cls.extract_enum_value(build_dict, field,
attribute)
elif is_date(attribute):
value = cls.extract_date_value(build_dict, field)
else:
value = build_dict.get(field)
setattr(cls_builder, field, value)
return cls_builder.build()
def convert_field_value(field: attr.Attribute,
field_value: Union[str, EnumParser]) -> Any:
if field_value is None:
return None
if is_forward_ref(field) or is_list(field):
return field_value
if isinstance(field_value, str):
if not field_value or not field_value.strip():
return None
if field.name in converter_overrides:
converter = converter_overrides[field.name]
if not isinstance(field_value, converter.field_type):
raise ValueError(
f"Found converter for field [{field.name}] in the converter_overrides, but expected "
f"field type [{converter.field_type}] does not match actual field type "
f"[{type(field_value)}]")
return converter.convert(field_value)
if isinstance(field_value, EnumParser):
if is_enum(field):
return field_value.parse()
raise ValueError(
f"Found field value [{field_value}] for field that is not an enum [{field}]."
)
if isinstance(field_value, str):
if is_str(field):
return normalize(field_value)
if is_date(field):
return parse_date(field_value)
if is_int(field):
return parse_int(field_value)
if field.type in {bool, Union[bool, None]}:
return parse_bool(field_value)
raise ValueError(f"Unsupported field {field.name}")
def _convert_forward(self, src: SrcBaseType,
populate_back_edges: bool) -> DstBaseType:
"""Converts the given src object to its entity/schema counterpart."""
src_id = self._id_from_src_object(src)
if src_id in self._converted_map:
return self._converted_map[src_id]
schema_cls: Type[DatabaseEntity] = self._get_schema_class(src)
entity_cls: Type[Entity] = self._get_entity_class(src)
if entity_cls is None or schema_cls is None:
raise DatabaseConversionError("Both |entity_cls| and |schema_cls| "
"should be not None")
if isinstance(src, Entity):
dst_builder: \
Union[BuildableAttr.Builder, DatabaseEntity] = schema_cls()
elif isinstance(src, DatabaseEntity):
if not issubclass(entity_cls, BuildableAttr):
raise DatabaseConversionError(
f"Expected [{entity_cls}] to be a subclass of "
f"BuildableAttr, but it is not")
dst_builder = entity_cls.builder()
else:
raise DatabaseConversionError(
"Unable to convert class [{0}]".format(src.__class__))
for field, attribute in attr.fields_dict(entity_cls).items():
if self._should_skip_field(entity_cls, field):
continue
if self._direction_checker.is_back_edge(src, field) and \
not populate_back_edges:
continue
v = getattr(src, field)
if not isinstance(attribute, attr.Attribute):
raise DatabaseConversionError(
f"Expected attribute with class [{attribute.__class__}] to "
f"be an instance of Attribute, but it is not")
if isinstance(v, list):
values = []
for next_src in v:
if self._direction_checker.is_back_edge(src, field):
self._register_back_edge(src, next_src, field)
continue
values.append(
self._convert_forward(next_src, populate_back_edges))
if not values:
continue
value: Optional[Any] = values
elif issubclass(type(v), Entity) or issubclass(
type(v), DatabaseEntity):
next_src = v
if self._direction_checker.is_back_edge(src, field):
self._register_back_edge(src, next_src, field)
continue
value = self._convert_forward(v, populate_back_edges)
elif v is None:
value = None
elif is_enum(attribute):
value = self._convert_enum(src, field, attribute)
else:
value = v
setattr(dst_builder, field, value)
if isinstance(dst_builder, BuildableAttr.Builder):
dst = dst_builder.build()
elif isinstance(dst_builder, DatabaseEntity):
dst = dst_builder
else:
raise DatabaseConversionError(
f"Unexpected type [{type(dst_builder)}] for dst_builder")
self._converted_map[src_id] = dst
return dst
