Boolean query parameters in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a boolean query parameter in FastAPI.

FastAPI

from fastapi import FastAPI, Query

app = FastAPI()

@app.get("/items/")
async def read_items(available: bool = Query([1])):
    return {"available": available}

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

ATrue

BNone

C"true"

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using string values like "true" or "false" instead of boolean True or False.

Leaving the default as None which is not a boolean.

The default value for a boolean query parameter should be a boolean type like False. Using False sets the default to false.

2fill in blank

medium

Complete the code to make the boolean query parameter optional with a default of None.

FastAPI

from typing import Optional
from fastapi import FastAPI, Query

app = FastAPI()

@app.get("/items/")
async def read_items(available: Optional[bool] = Query([1])):
    return {"available": available}

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

A"false"

BFalse

CNone

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a boolean default like True or False when the parameter should be optional.

Using string values instead of None for optional parameters.

To make a boolean query parameter optional, set its default to None and use Optional[bool] as the type.

3fill in blank

hard

Fix the error in the code by completing the boolean query parameter declaration correctly.

FastAPI

from fastapi import FastAPI, Query

app = FastAPI()

@app.get("/items/")
async def read_items(available: bool = [1]):
    return {"available": available}

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

AQuery(True)

BQuery("False")

CQuery("true")

DQuery(None)

Attempts:

3 left

💡 Hint

Common Mistakes

Passing string values like "true" or "False" inside Query for boolean parameters.

Passing None without Optional type hint.

The default value inside Query() for a boolean parameter must be a boolean, like True. Using strings causes errors.

4fill in blank

hard

Fill both blanks to declare an optional boolean query parameter with a default of None and a description.

FastAPI

from typing import Optional
from fastapi import FastAPI, Query

app = FastAPI()

@app.get("/items/")
async def read_items(available: Optional[bool] = Query([1], description=[2])):
    return {"available": available}

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

ANone

B"Is the item available?"

CTrue

D"Optional boolean parameter"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a boolean default instead of None for optional parameters.

Passing non-string values as description.

Use None as the default to make the parameter optional. The description should be a string explaining the parameter.

5fill in blank

hard

Fill all three blanks to declare a boolean query parameter with a default, alias, and description.

FastAPI

from fastapi import FastAPI, Query

app = FastAPI()

@app.get("/items/")
async def read_items(
    available: bool = Query(
        default=[1],
        alias=[2],
        description=[3]
    )
):
    return {"available": available}

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

AFalse

B"is_available"

C"Filter items by availability"

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-boolean default values.

Using non-string alias or description.

The default is False. The alias is a string used in the query URL. The description explains the parameter.