python type_error ai_generated true

类型错误：'Depends' 对象不可调用

TypeError: 'Depends' object is not callable

ID: python/fastapi-dependency-error-callable

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80%修复率
85%置信度
0证据数
2025-02-14首次发现

版本兼容性

版本状态引入弃用备注
3.x active — — —

根因分析

错误地将Depends用作函数而不是依赖注入。

English

Using Depends incorrectly as a function instead of a dependency injection.

generic

解决方案

  1. 95% 成功率 Use Depends as a parameter without calling it. 
    from fastapi import Depends
async def read_items(db: Session = Depends(get_db)):
  2. 90% 成功率 If using a callable dependency, define it as a function and pass it to Depends. 
    def common_parameters(q: str = None):
    return {'q': q}

@app.get('/items')
async def read_items(commons: dict = Depends(common_parameters)):

无效尝试

常见但无效的做法:

  1. Calling Depends() with parentheses inside a function parameter. 80% 失败

    Depends should be used without calling it; it's a class.

  2. Importing Depends from the wrong module. 60% 失败

    Depends is from fastapi, not from fastapi.params.