solve_dependencies

Recursively resolves all dependencies for a given request, extracting values from path parameters, query strings, headers, cookies, and the request body. It manages dependency caching, handles overrides, and ensures proper cleanup using asynchronous exit stacks.

def solve_dependencies(
    request: Request | WebSocket,
    dependant: Dependant,
    body: dict[str, Any] | FormData | bytes | None = None,
    background_tasks: StarletteBackgroundTasks | None = None,
    response: Response | None = None,
    dependency_overrides_provider: Any | None = None,
    dependency_cache: dict[DependencyCacheKey, Any] | None = None,
    async_exit_stack: AsyncExitStack,
    embed_body_fields: bool
) - > SolvedDependency

Recursively resolves all dependencies for a given route handler, extracting values from the request and executing dependency functions. It manages the dependency lifecycle, including caching, overrides, and integration with async exit stacks for resource cleanup.

Parameters

Name	Type	Description
request	`Request	WebSocket`
dependant	Dependant	The metadata object defining the hierarchy of dependencies and parameters required by the target function.
body	`dict[str, Any]	FormData
background_tasks	`StarletteBackgroundTasks	None` = None
response	`Response	None` = None
dependency_overrides_provider	`Any	None` = None
dependency_cache	`dict[DependencyCacheKey, Any]	None` = None
async_exit_stack	AsyncExitStack	A legacy parameter maintained for compatibility; the function now primarily uses stacks found within the request scope.
embed_body_fields	bool	A flag indicating whether single body parameters should be expected as embedded JSON fields rather than the root body.

Returns

Type	Description
SolvedDependency	An object containing the resolved parameter values, any validation errors encountered, the background tasks instance, and the updated dependency cache.