solve_dependencies

Recursively solves dependencies for a given dependant, including sub-dependencies, path, query, header, and cookie parameters, and body fields. It manages dependency caching, handles generator dependencies, and collects any errors encountered during the process.

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 solves dependencies for a given dependant, handling path, query, header, cookie, and body parameters, and applying dependency overrides. This function is used internally by FastAPI to resolve all required arguments for a route or dependency.

Parameters

Name	Type	Description
request	`Request	WebSocket`
dependant	Dependant	The dependant object representing the current dependency or route, including its sub-dependencies and parameter definitions.
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	An AsyncExitStack used to manage the lifecycle of generator dependencies, ensuring they are properly closed.
embed_body_fields	bool	A boolean indicating whether body fields should be embedded directly or treated as a single body parameter.

Returns

Type	Description
SolvedDependency	An object containing the solved dependency values, any errors encountered, background tasks, the response object, and the updated dependency cache.