MongoDB integration with Motor in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an async MongoDB client using Motor.

FastAPI

from motor.motor_asyncio import AsyncIOMotorClient

client = AsyncIOMotorClient([1])
db = client.test_database

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

A'http://localhost:27017'

B'mongodb://localhost:27017'

C'ftp://localhost:27017'

D'localhost:27017'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'http://' or 'ftp://' instead of 'mongodb://'.

Omitting the protocol prefix.

The connection string for MongoDB must start with mongodb://. This tells Motor to connect to a MongoDB server.

2fill in blank

medium

Complete the FastAPI endpoint to insert a document into MongoDB asynchronously.

FastAPI

from fastapi import FastAPI

app = FastAPI()

@app.post('/add')
async def add_item(item: dict):
    result = await db.items.[1](item)
    return {'inserted_id': str(result.inserted_id)}

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

Ainsert_one

Bfind_one

Cdelete_one

Dupdate_one

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'find_one' which only retrieves data.

Using 'delete_one' or 'update_one' which modify or remove data.

To add a new document, use insert_one which inserts a single document asynchronously.

3fill in blank

hard

Fix the error in the async function to find one document by name.

FastAPI

async def get_item(name: str):
    document = await db.items.find_one({{'name': [1])
    return document

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

Astr(name)

B'name'

Cname()

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around the variable name, making it a string literal.

Calling the variable as a function.

The value for the 'name' key should be the variable name without quotes, so it uses the function argument.

4fill in blank

hard

Fill both blanks to update a document's field asynchronously.

FastAPI

async def update_item(name: str, new_value: str):
    result = await db.items.update_one(
        {{'name': [1],
        {{'$set': {{'field': [2]
    )
    return result.modified_count

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

Aname

Bnew_value

C'new_value'

D'name'

Attempts:

3 left

💡 Hint

Common Mistakes

Using string literals instead of variables.

Mixing up which variable goes where.

Use the variable name to find the document and new_value to set the new field value.

5fill in blank

hard

Fill all three blanks to delete a document by id asynchronously.

FastAPI

from bson import ObjectId

async def delete_item(item_id: str):
    result = await db.items.delete_one({{'_id': [1]([2])}})
    return result.deleted_count

# Call example: await delete_item([3])

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

AObjectId

Bitem_id

C'some_id_string'

Dstr

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the id as a plain string without ObjectId conversion.

Using wrong variable names in the call example.

Use ObjectId to convert the string item_id to an ObjectId for the query. The call example uses the variable item_id.