guideCity/backend/app/api/routes/cities.py

import logging

from fastapi import APIRouter, Depends
from geoalchemy2 import Geometry
from sqlalchemy import cast, func, select
from sqlalchemy.orm import Session

from app.db.session import get_db
from app.models.city import City
from app.schemas.city import CityOut
from app.schemas.common import LatLon, LocalizedName

logger = logging.getLogger("guidecity.cities")

router = APIRouter(tags=["cities"])


@router.get("/cities", response_model=list[CityOut])
def list_cities(db: Session = Depends(get_db)) -> list[CityOut]:
    stmt = select(
        City,
        func.ST_X(cast(City.center_point, Geometry)).label("lon"),
        func.ST_Y(cast(City.center_point, Geometry)).label("lat"),
    )
    rows = db.execute(stmt).all()

    out = []
    for city, lon, lat in rows:
        center = LatLon(lat=lat, lon=lon) if lat is not None and lon is not None else None
        out.append(
            CityOut(
                id=city.id,
                slug=city.slug,
                name=LocalizedName(ru=city.name_ru, en=city.name_en),
                center=center,
            )
        )
    logger.debug("listed %d cities", len(out))
    return out