get_value_or_default() — fastapi Function Reference

Architecture documentation for the get_value_or_default() function in utils.py from the fastapi codebase.

Function python FastAPI Applications called by 2

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FastAPI→ Applications→ get_value_or_default() — fastapi Function Reference

Dependency Diagram

graph TD
  ba32f931_603d_6b3e_d601_c9cf3fce1825["get_value_or_default()"]
  1c2c0e68_6ed1_7632_8c35_00818f97b599["utils.py"]
  ba32f931_603d_6b3e_d601_c9cf3fce1825 -->|defined in| 1c2c0e68_6ed1_7632_8c35_00818f97b599
  27778071_8d5b_35e0_a46c_5aa1fbf21fac["add_api_route()"]
  27778071_8d5b_35e0_a46c_5aa1fbf21fac -->|calls| ba32f931_603d_6b3e_d601_c9cf3fce1825
  c1d02f65_9a84_123a_bdd4_304e5732f35a["include_router()"]
  c1d02f65_9a84_123a_bdd4_304e5732f35a -->|calls| ba32f931_603d_6b3e_d601_c9cf3fce1825
  style ba32f931_603d_6b3e_d601_c9cf3fce1825 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

fastapi/utils.py lines 123–138

def get_value_or_default(
    first_item: Union[DefaultPlaceholder, DefaultType],
    *extra_items: Union[DefaultPlaceholder, DefaultType],
) -> Union[DefaultPlaceholder, DefaultType]:
    """
    Pass items or `DefaultPlaceholder`s by descending priority.

    The first one to _not_ be a `DefaultPlaceholder` will be returned.

    Otherwise, the first item (a `DefaultPlaceholder`) will be returned.
    """
    items = (first_item,) + extra_items
    for item in items:
        if not isinstance(item, DefaultPlaceholder):
            return item
    return first_item