Dependencies with parameters in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a dependency function with a parameter.

FastAPI

from fastapi import Depends, FastAPI

app = FastAPI()

def common_parameters(q: str = [1]):
    return {"q": q}

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

Drag options to blanks, or click blank then click option'

A"default"

BFalse

CNone

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string like "default" instead of None for optional parameters.

Forgetting to set a default value, making the parameter required.

The parameter q has a default value of None, making it optional.

2fill in blank

medium

Complete the code to inject a dependency with a parameter into a path operation.

FastAPI

from fastapi import Depends, FastAPI

app = FastAPI()

def query_extractor(q: str = None):
    return q

@app.get("/search/")
async def search(q: str = Depends([1])):
    return {"query": q}

Drag options to blanks, or click blank then click option'

Aquery_extractor

BDepends

CFastAPI

Dsearch

Attempts:

3 left

💡 Hint

Common Mistakes

Passing Depends itself instead of the dependency function.

Passing the FastAPI app instance instead of a function.

The dependency function query_extractor is passed to Depends to inject its result.

3fill in blank

hard

Fix the error in the dependency function parameter default value.

FastAPI

from fastapi import Depends, FastAPI

app = FastAPI()

def pagination(skip: int = [1]):
    return {"skip": skip}

@app.get("/items/")
async def list_items(pagination: dict = Depends(pagination)):
    return pagination

Drag options to blanks, or click blank then click option'

A"0"

BNone

CFalse

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string "0" instead of integer 0 as default.

Using None for a parameter that expects an int without Optional.

The default value for skip should be an integer 0, not a string.

4fill in blank

hard

Fill both blanks to create a dependency with two parameters and use it in a path operation.

FastAPI

from fastapi import Depends, FastAPI

app = FastAPI()

def pagination(skip: int = 0, limit: int = [1]):
    return {"skip": skip, "limit": limit}

@app.get("/items/")
async def list_items(pagination: dict = Depends([2])):
    return pagination

Drag options to blanks, or click blank then click option'

A10

Bpagination

C5

Dlist_items

Attempts:

3 left

💡 Hint

Common Mistakes

Using the path operation function name instead of the dependency function.

Setting limit default to a string instead of an integer.

The default limit is set to 10, and the dependency function pagination is passed to Depends.

5fill in blank

hard

Fill all three blanks to create a dependency with parameters and use it with type hints in the path operation.

FastAPI

from fastapi import Depends, FastAPI

app = FastAPI()

def query_params(q: str = None, skip: int = 0, limit: int = [1]):
    return {"q": q, "skip": skip, "limit": limit}

@app.get("/search/")
async def search_items(params: dict = Depends([2])) -> [3]:
    return params

Drag options to blanks, or click blank then click option'

A20

Bquery_params

Cdict

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect default values for limit.

Passing the wrong function to Depends.

Using wrong or missing return type hints.

The default limit is 20, the dependency function is query_params, and the return type hint is dict.