_annotation_is_complex() — fastapi Function Reference

Architecture documentation for the _annotation_is_complex() function in shared.py from the fastapi codebase.

Function python FastAPI Routing calls 2 called by 1

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FastAPI→ Routing→ _annotation_is_complex() — fastapi Function Reference

Dependency Diagram

graph TD
  dfada564_89da_782d_9604_dfd9bf49f8ea["_annotation_is_complex()"]
  3e898b29_4dd8_c417_2d9b_a84d867423b4["shared.py"]
  dfada564_89da_782d_9604_dfd9bf49f8ea -->|defined in| 3e898b29_4dd8_c417_2d9b_a84d867423b4
  e3e32bb4_c2f8_785e_9705_9539ba56c60e["field_annotation_is_complex()"]
  e3e32bb4_c2f8_785e_9705_9539ba56c60e -->|calls| dfada564_89da_782d_9604_dfd9bf49f8ea
  eda91ac5_1bd0_0d8b_6e77_6b82c2f46ce9["lenient_issubclass()"]
  dfada564_89da_782d_9604_dfd9bf49f8ea -->|calls| eda91ac5_1bd0_0d8b_6e77_6b82c2f46ce9
  42e192a3_9947_71f3_357b_4a6d32fd71a1["_annotation_is_sequence()"]
  dfada564_89da_782d_9604_dfd9bf49f8ea -->|calls| 42e192a3_9947_71f3_357b_4a6d32fd71a1
  style dfada564_89da_782d_9604_dfd9bf49f8ea fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

fastapi/_compat/shared.py lines 82–87

def _annotation_is_complex(annotation: Union[type[Any], None]) -> bool:
    return (
        lenient_issubclass(annotation, (BaseModel, Mapping, UploadFile))
        or _annotation_is_sequence(annotation)
        or is_dataclass(annotation)
    )