rlt_salary/app/database/methods.py

from typing import List, Tuple 
from motor.motor_asyncio import AsyncIOMotorCollection
import datetime as dt

async def aggregate_salaries(collection: AsyncIOMotorCollection, dt_from: str, dt_upto: str, group_type: str) -> Tuple[List[int], List[str]]: # type: ignore
    pipeline = [
        {
            "$match": {
                "dt": {
                    "$gt": iso(dt_from),
                    "$lt": iso(dt_upto)
                }
            }
        },
        {
            "$group": {
                "_id": {
                    "$dateToString": 
                        {
                            "format": "%Y-%m-%dT00:00:00",
                            "date": "$dt"
                            }
                    },
                "sum": {
                    "$sum": "$value"
                    },
            }
        }
    ]

    dataset = []
    labels = []

    async for document in collection.aggregate(pipeline):
        dataset.append(document["sum"])
        labels.append(document["_id"]  )

    return {"dataset": dataset, "labels": labels}

def iso(date: str) -> dt.datetime:
    return dt.datetime.fromisoformat(date)