main.py

# from fastapi import FastAPI

# app = FastAPI()

# @app.get("/")

# def home():
#     return{"message": "Hello world from FastApI VENV"}

# from fastapi import FastAPI

# app = FastAPI()

# # Home Route
# @app.get("/") # ye blackslash ye dikha rha hai ku ki home route ke liye simple blackslash lagan hai 
# # ek route ke saath ek function attach hota hai
# def home():
#     return{"message": "welcome to FastAPI"} 

# # About route
# @app.get("/about")
# def about():
#     return{"message": "this is a about page"} 

# # users route
# @app.get("/users")
# def user():
#     return{
#         "users" : ["Mohit","swati","rahul"]

#     } 

# Dynamic Routes

# from fastapi import FastAPI

# app = FastAPI()

# @app.get("/users/{user_id}") # ye path parameter hai {} ka use hua hai 

# def get_users(user_id):
#     return{
#         "user_id":user_id
#     }

# @app.get("/users/{user_name}")

# def get_users(user_name:str):
#     return{
#         "user_id": user_name
#     }

# from fastapi import FastAPI

# app =  FastAPI()

# @app.post("/create-users")
# def create_user(name:str,age:int):
#     return{
#         "Name" : name,
#         "Age" : age
#     }

# @app.post("/create-user")
# def create_user(user:dict):
#     return{
#         "message" : "user created",
#         "data" : user
#     }

# Pydnatic model

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()

class Users(BaseModel):
    name : str
    age: int

@app.post("/created_user")
def created_user(user:Users):
    return{
        "message" : "user_created",
        "data" : user

    }    

# nested pydantic model

from pydantic import BaseModel
from fastapi import FastAPI

app = FastAPI()

class Address(BaseModel):
    city: str
    pincode : int
class Users(BaseModel):
    name: str
    age: int
    address: Address

@app.post("/created_user")
def created_user(User:Users):
    return User