Field validation rules in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the correct class for field validation in FastAPI.

FastAPI

from pydantic import [1]

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

ASchema

BBaseModel

CValidator

DField

Attempts:

3 left

💡 Hint

Common Mistakes

Importing BaseModel instead of Field

Using Validator which is not a class in pydantic

Using Schema which is deprecated

The Field class is used to add validation rules to model fields in FastAPI.

2fill in blank

medium

Complete the code to set a minimum length validation for a string field.

FastAPI

name: str = Field(..., min_length=[1])

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

A0

B1

C10

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero which allows empty strings

Using too large minimum length causing validation errors

Setting min_length=1 ensures the string must have at least one character.

3fill in blank

hard

Fix the error in the code by choosing the correct parameter to enforce a maximum value for an integer field.

FastAPI

age: int = Field(..., [1]=120)

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

Amax

Bmax_value

Cle

Dmax_length

Attempts:

3 left

💡 Hint

Common Mistakes

Using max_length which is for strings

Using max_value which is not a valid parameter

Using max which is not recognized

In Pydantic, le means 'less than or equal to' and is used to set a maximum value.

4fill in blank

hard

Fill both blanks to add a regex pattern and a default value to a string field.

FastAPI

email: str = Field(default=[1], regex=[2])

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

A"[e-mail]"

B"^\S+@\S+\.\S+$"

C"[a-z]+"

D"[e-mail]"

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid regex patterns

Setting default to an invalid email format

The default email is set to "[e-mail]" and the regex ensures a simple email format.

5fill in blank

hard

Fill all three blanks to create a field with a title, description, and example value.

FastAPI

username: str = Field([1], title=[2], example=[3])

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

A"guest"

B"User Name"

C"guest123"

D"The name of the user"

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up title and description

Using example as a description

The field has a default value "guest", a title "User Name", and an example "guest123" to help API users.