openapi-pydantic/openapi_pydantic/v3/v3_0

OpenAPI v3.0 schema classes

Alias

Due to the reserved words in python and pydantic, the following fields are used with alias feature provided by pydantic:

Class	Field name in the class	Alias (as in OpenAPI spec)
Header*	param_in	in
MediaType	media_type_schema	schema
Parameter	param_in	in
Parameter	param_schema	schema
PathItem	ref	$ref
Reference	ref	$ref
SecurityScheme	security_scheme_in	in
Schema	schema_format	format
Schema	schema_not	not

The "in" field in Header object is actually a constant ({"in": "header"}).

For convenience of object creation, the classes mentioned in above have configured allow_population_by_field_name=True (Pydantic V1) or populate_by_name=True (Pydantic V2).

Reference: Pydantic's Model Config

Non-pydantic schema types

Due to the constriants of python typing structure (not able to handle dynamic field names), the following schema classes are actually just a typing of Dict:

Schema Type	Implementation
Callback	Callback = Dict[str, PathItem]
Paths	Paths = Dict[str, PathItem]
Responses	Responses = Dict[str, Union[Response, Reference]]
SecurityRequirement	SecurityRequirement = Dict[str, List[str]]

On creating such schema instances, please use python's dict type instead to instantiate.