main.py

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import Optional

app = FastAPI()
notes = []
note_id = 1

class Note(BaseModel):
    title: str
    content: str

@app.post("/notes")
def add(note: Note):
    global note_id
    singleNote = {
        "id":note_id,
        "title":note.title,
        "content":note.content
    }

    notes.append(singleNote)
    note_id+=1

    return singleNote

@app.get("/allNotes")
def allNotes():
    return notes

@app.delete("/deleteNote/{note_id}")
def deleteNote(note_id: int):
    for item in range(len(notes)):
        if notes[item]["id"]== note_id:
            notes.pop(item)
            return {"message":"Note has been removed"}
        
    raise HTTPException (
        status_code=404, detail="Note ID not found"
    )

class noteUpdate(BaseModel):
    title: Optional[str] = None
    content: Optional[str] = None

@app.patch("/updateNote")
def updateNotes(note: noteUpdate, note_id: int):
    
    if note.title is None and note.content is None:
        raise HTTPException (
            status_code=400, detail="Nothing to update"
        )
    
    for item in notes:
        if item["id"] == note_id:
            if note.title is not None:
                item["title"] = note.title
            if note.content is not None:
                item["content"] = note.content

            return item
    
    raise HTTPException (
                status_code=404, detail="Note ID not found"
            )