Pagination patterns in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the FastAPI class.

FastAPI

from fastapi import [1]
app = [1]()

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

AFastAPI

BRequest

CResponse

DDepends

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request or Response instead of FastAPI.

Forgetting to create the app instance.

The FastAPI class is imported from the fastapi module to create the app instance.

2fill in blank

medium

Complete the code to add query parameters for pagination: skip and limit.

FastAPI

@app.get('/items/')
async def read_items(skip: int = [1], limit: int = 10):
    return {'skip': skip, 'limit': limit}

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

A1

B0

CNone

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Setting skip default to 1, which skips the first item unintentionally.

Using None as default which causes errors.

Setting skip default to 0 means start from the first item.

3fill in blank

hard

Fix the error in the code to correctly use the Query function for limit with a default and max value.

FastAPI

from fastapi import Query

@app.get('/items/')
async def read_items(limit: int = Query([1], le=100)):
    return {'limit': limit}

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

ANone

B100

C10

D'10'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string '10' instead of integer 10.

Using None which causes validation errors.

The default value for limit should be an integer, here 10, and le=100 limits max to 100.

4fill in blank

hard

Fill both blanks to create a paginated response with skip and limit parameters and return sliced items.

FastAPI

items = ['apple', 'banana', 'cherry', 'date', 'elderberry']

@app.get('/fruits/')
async def get_fruits(skip: int = [1], limit: int = [2]):
    return items[skip:skip + limit]

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

A0

B5

C10

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Setting skip to 1 which skips the first item.

Setting limit too large or zero.

Skip starts at 0 to begin from the first item, limit is 1 to return one item per page.

5fill in blank

hard

Fill all three blanks to implement cursor-based pagination using a query parameter 'cursor' and slicing the items list.

FastAPI

items = ['a', 'b', 'c', 'd', 'e', 'f']

@app.get('/letters/')
async def get_letters(cursor: int = [1], limit: int = [2]):
    start = cursor if cursor >= 0 else 0
    end = start + limit
    return {'items': items[start:end], 'next_cursor': [3] if end < len(items) else None}

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

A0

B3

Cend

Dcursor + limit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'end' as next_cursor which is a variable but not the cursor position.

Setting cursor default to negative values.

Using limit as next_cursor.

Cursor starts at 0, limit is 3 items per page, next_cursor is cursor + limit for next page.