CS504070 - Homework 9: Advanced Models

cs504070-homework-9.md

CS504070 - Homework 9

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Exercise 1: UUID and Datetime Fields

Create a FastAPI endpoint that receives and returns data containing both UUID and datetime fields.

Requirements:

• Create a Pydantic model Event containing the following fields:
  • id: UUID (auto-generated if not provided).
  • name: String.
  • timestamp: Datetime (auto-generated as current UTC time if not provided).
• The endpoint should receive an Event model and return the created event with assigned values.

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Exercise 2: Nested Models

Create a FastAPI endpoint to handle a complex nested request body.

Requirements:

• Define a nested Pydantic model structure as follows:

class Address(BaseModel):
    street: str
    city: str
    zip_code: str

class User(BaseModel):
    user_id: UUID
    username: str
    email: str
    address: Address

• The endpoint should accept a User model and return it.

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Exercise 3: List Fields

Design a FastAPI endpoint to handle list fields within the request body.

Requirements:

• Create the following models:

class Product(BaseModel):
    product_id: UUID
    name: str
    price: float

class Order(BaseModel):
    order_id: UUID
    products: List[Product]
    order_date: datetime

• Implement a POST endpoint that receives an Order and returns the order details.

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Exercise 4: Advanced Nested Structures and Lists

Build a FastAPI endpoint with a deeply nested structure containing lists and datetime fields.

Requirements:

• Define models as follows:

class Author(BaseModel):
    author_id: UUID
    name: str
    email: Optional[str]

class Comment(BaseModel):
    comment_id: UUID
    content: str
    created_at: datetime
    author: Author

class BlogPost(BaseModel):
    post_id: UUID
    title: str
    content: str
    published_at: datetime
    tags: List[str]
    comments: List[Comment]

• The endpoint should accept a BlogPost object and return the received post data.

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Exercise 5: Validation and Nested UUID/Datetime

Enhance validation on UUID and datetime fields within nested structures.

Requirements:

• Implement a model:

class TaskDetail(BaseModel):
    detail_id: UUID
    description: str
    deadline: datetime

class Task(BaseModel):
    task_id: UUID
    title: str
    created_at: datetime
    details: List[TaskDetail]

• Validate that deadline in each TaskDetail must be greater than the current datetime.
• Write a POST endpoint that validates this model and returns the task if validation passes.