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from typing import Optional

from fastapi import Depends, FastAPI

app = FastAPI()

fake_items_db = [{"item_name": "Foo"}, {"item_name": "Bar"}, {"item_name": "Baz"}]

class CommonQueryParams:

def __init__(self, q: Optional[str] = None, skip: int = 0, limit: int = 100):

self.q = q

self.skip = skip

self.limit = limit

@app.get("/items/")

async def read_items(commons: CommonQueryParams = Depends(CommonQueryParams)):

response = {}

if commons.q:

response.update({"q": commons.q})

items = fake_items_db[commons.skip : commons.skip + commons.limit]

response.update({"items": items})

return response