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from itertools import islice
from typing import List
from polyfactory.factories.pydantic_factory import ModelFactory
from pydantic import BaseModel
from litestar import Litestar, get
from litestar.pagination import AbstractSyncOffsetPaginator, OffsetPagination
class Person(BaseModel):
id: str
name: str
class PersonFactory(ModelFactory[Person]):
__model__ = Person
# we will implement a paginator - the paginator must implement two methods 'get_total' and 'get_items'
# we would usually use a database for this, but for our case we will "fake" the dataset using a factory.
class PersonOffsetPaginator(AbstractSyncOffsetPaginator[Person]):
def __init__(self) -> None:
self.data = PersonFactory.batch(50)
def get_total(self) -> int:
return len(self.data)
def get_items(self, limit: int, offset: int) -> List[Person]:
return list(islice(islice(self.data, offset, None), limit))
paginator = PersonOffsetPaginator()
# we now create a regular handler. The handler will receive two query parameters - 'limit' and 'offset', which
# we will pass to the paginator.
@get("/people", sync_to_thread=False)
def people_handler(limit: int, offset: int) -> OffsetPagination[Person]:
return paginator(limit=limit, offset=offset)
app = Litestar(route_handlers=[people_handler])
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